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cng ty khong sn Lao Cai Tuyn khong i c-ng

Li ni u

Nm trong chng trnh thc hin phng n chy chnh nh

dy chuyn thit b v cng ngh Nh my tuyn st Khe Lch,nhm k thut bin son ti liu Tuyn khong i cng nhm

gip CNKT nm bt c c bn v chuyn ngnh Tuyn khong.

Do thi gian hn ch ( t ngy 1-18/7/2008 ) v vi nhu cu CN

phi nm bt ngay c nhng kin thc sm tham gia vn hnh

v a Nh my tuyn vo hot ng trn c s Ti liu Tuyn

khong i cng ch cp ti nhng cng ngh thit b lin quan

trc tip Nh my, m khng m rng thm cc cng ngh thit b

khc trong ngnh tuyn khong. Trong qu trnh thc hin nhm k

thut xin chn thnh cm n ng: ng Tin Minh Trng BQLDAv

cc /c lnh o Cng ty khong sn Lo Cai to iu kin

chng ti hon thin ti liu ny./.

Lao Cai thng 06/2008

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Xin chn trng cm n!

Phn I: gii thiu khi qut v tuyn khong

Chng I : Khi qut chung

Bi1. Mt s nh ngha, khi nim chung v tuynkhong

1. Khong vt.Khong vt l sn phm t nhin ca qu trnh ho l v cc tc

ng a cht xy ra trong v tri t, c thnh phn tng ing nht v nhng tnh cht ho l xc nh.

2. Khong sn c ch.Khong sn c ch l tp hp phc tp cc khong vt khc nhau.

Khong vt cha cht c ch gi l khong vt c ch. Quan nim vkhong vt c ch ch l tng i v trong trng hp ny khong vtl c ch, trong trng hp khc li l khng c ch.

V d: Trong m qung st c cha cc thnh phn nh Manhetitc gi l khong sn c ch v n c cha cc thnh phn c ch ktrn.

3. Tuyn khong.


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Tuyn khong l qu trnh gia cng hoc ch bin khong snbng phng php c gii m khng lm cc khong vt thay i vthnh phn ho hc.

Tuyn khong cn l mt khu khng th thiu c gia vickhai thc v ch bin khong sn.

4. Qung nguyn khai.Khong sn c ch a vo tuyn c gi l vt liu u hay gi

l qung nguyn khai. 5. Tinh qung.

Tinh qung l sn phm sau khi tuyn m i a s khong vtc ch chim trong sn phm .

V d : Theo thit k sn phm tinh qung st c hm lng60%.

6. ui thi.ui thi l sn phm m trong khng c khong vt c ch

hoc c rt t khong vt .V d: Theo thit k hm lng st t c trong ui thi l

5.96%.

7. Sn phm trung gian.L sn phm thu c qua mt khu gia cng hoc ch bin no

v l nguyn liu cho khu gia cng ch bin khc.8.Hm lng qung nguyn khai.Hm lng qung nguyn khai l t l gia trng lng cht c ch

c trong qung nguyn khai v trng lng ca qung nguyn khai .K hiu l , n v tnh: %.

q = ------- x 100, %.

Q

Trong : q - L trng lng khong vt c ch c trong vt liu u( tn ).

Q - L trng lng vt liu u ( tn ).V d: Trong 1000g qung ca m c cha 308.2 gam kim loi

st. Hm lng Fe nguyn khai khi l:

= (308.2 / 1000) x 100% = 30.82%.

9. Hm lng tinh qung.


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L t l gia trng lng cht c ch c trong sn phm tinhqung v trng lng ca sn phm tinh qung , k hiu l , nv tnh: %.

PTQTQ = --------- x 100, %.

Qtq

Trong : PTQ - L trng lng cht c ch c trong tinh qung( tn, kg ).

Q tq - Trng lng tinh qung ( tn , kg ).V d: Trong 100 gam tinh qung ca xng tuyn khong XN

th c cha 60 gam Fe. Hm lng tinh qung st khi l:60

= --------- x 100 % = 60 % Fe100

10. Hm lng ui thi.L t l gia trng lng cht c ch c trong sn phm thi v

trng lng sn phm thi. K hiu l: , n v tnh: %.Pt

= --------- x 100, %.

Q t

Trong : Pt - l trng lng cht c ch c trong sn phmthi( tn ).

Q t - trng lng sn phm thi ( tn ).V d: Trong 100 gam ui thi ca xng tuyn khong XN th

c cha 5.96 gam Fe. Hm lng st trong ui thi khi l:

5.96

= --------- x 100 = 5.96 %Fe.100

11. Thu hoch sn phm.L t s gia trng lng ca sn phm v trng lng vt liu u.

K hiu l: , n v: %.Q sp

= --------- x 100, %.Q

Trong : Q sp - Trng lng sn phm ( tn, kg ).


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Q - Trng lng vt liu u ( tn , kg ). tq + t = = 100

Trong : tq : Thu hoch tinh qung, ( % ).

t : Thu hoch thi, ( % ).V d: Trng lng qung a tuyn trong 1 ca sn xut c XN l100 tn. Sau khi tuyn thu c 40 tn tinh qung. Tnh thu hoch caca sn xut .

Thu hoch ca ca sn xut c tnh theo cng thc sau:

Q sp 40= --------- x 100 = -------- x 100 = 40 %.

Q 100

12. T l thu hi ( thc thu ).L t s gia trng lng ca cht c ch c trong sn phm v

trng lng ca n c trong vt liu u. K hiu: , n v tnh: %.

Ptq = --------- x 100, %.

PTrong : Psp - Trng lng cht c ch c trong tinh qung ( tn,

kg ). P - Trng lng cht c ch c trong vt liu u( tn , kg ).

Psp = . Qtq / 100, ( tn, kg ).P = . Q / 100, ( tn, kg ).

tq + t = = 100Hoc xc nh theo cng thc sau :

tq = (x ) / .Trong : tq : Thc thu tinh qung, (%).

t : Thc thu thi, (%).V d: Trng lng qung a tuyn trong 1 ca sn xut ca XN

tuyn st l 100 tn, hm lng qung nguyn khai l 30 %Fe. Sau khituyn thu c 40 tn tinh qung c hm lng l 60 % Fe. Tnh thcthu tuyn ca ca sn xut .

Thc thu tuyn ca ca sn xut c tnh theo cng thc sau:

Ptq 60 . 40tq = --------- x 100 = -------------- x 100 = 80 %.


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P 30 . 100Hoc xc nh theo cng thc sau : tq = (tq x ) / = 80%.

t = 100 - tq = 100 - 80 = 20 %.

13. H s lm giu:H s lm giu i l t l gia hm lng tinh qung v hm lng

qung nguyn khai. n v : ln.H s lm giu c phn thnh hs lm giu b phn v h s lm giu chung.

* H s lm giu b phn l h s lm giu xc nh cho mt bphn no hoc mt khu no v c tnh theo cng thc sau:

bpibp = ------- ( ln )

Trong : bp - Hm lng tinh qung b phn, %.

- Hm lng nguyn khai ca b phn , %.ibp - H s lm giu b phn.

* H s lm giu chung l h s c xc nh bng t l giahm lng tinh qung cui cng v hm lng qung nguyn khai ctnh theo cng thc sau:

i = ------- ( ln )

Trong : - Hm lng tinh qung cui cng, %.- Hm lng nguyn khai ca b phn , %.i - H s lm giu chung.

14. Cch xc nh kch thc ht khong.Cch xc nh kch thc ht khong c xc nh bng kch thc

cc cnh hoc ng knh ht khong c th:- Ht hnh cu xc nh bng ng knh ht (d ).- Ht hnh dt th kch thc c ly bng b dy ht ( h ).- Ht hnh khi ( hnh v )

bb


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( d = b ) ld = ( l + b ) / 2

d = b . l

h l d = ( l + b + h ) / 3d = 3 b . l . h

15. Mi lin h gia cc ch tiu tuyn khong :tq . tq

tq = ----------- , %.NK

( - ). tqtq = ---------------- x 100 , %.

( tq - ).

tq + t = 100

tq + t = 100

Bi2. Phng php tuyn

-

1. Phng php tuyn t:L phng php tuyn da trn s khc nhau v t tnh ca cc

khong vt. Ton b cc khong vt c t tnh c my tuyn t ht ra lm sn phm. Cc khong vt khng c t tnh v t cthi ra hoc chuyn sang khu tuyn khc thu hi cc khong vtkhc.

2. Vai tr ca tuyn khong.L mt khu quan trng khng th thiu c gia vic khai thc

khong sn c hm lng khong vt c ch thp ( Cha quy cch vhm lng ) v vic ch bin khong sn tinh ( quy cch v hm lng

ch bin hoc luyn kim ).


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3. Khu tuyn.Trong tng phng php tuyn tu thuc vo mc lm giu

khong vt m ngi ta c th phn chia thnh tng khu tuyn.- Khu tuyn vt liu u gi l khu tuyn chnh.

- Tuyn li sn phm sch ca tuyn chnh l khu tuyn tinh.Trong khu tuyn tinh c th ch l mt khu hoc c th l nhiukhu tuyn tinh khc nhau ( i XN p dng mt khu tuyn tinh ).

V d:Qung nguyn khai

Tuyn chnh

T.tinh

T qungui thi

4. S tuyn.L hnh v th hin s lin tc v trnh t ca cc khu gia cng

khong sn c ch, bao gm cc s sau:

- S nh tnh.- S nh lng.- S bn nc.- S cng ngh, s thit b.- S gia cng, ly mu.- S cp thuc tuyn ( nu c s dng thuc tuyn ).- S lp t thit b.


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Chng II: Chun b khong sn

Bi1. Mt s khi nim c bn

1. Chun b khong sn .Chun b khong sn l mt khu khng th thiu c trong

tuyn khong. Nhm mc ch gii phng cc khong vt c ch rakhi cc lin tinh th v t , ng thi to ht thch hp chokhu tuyn.

2. Qu trnh p.L mt qu trnh gim kch thc ca vt liu nh tc ng ca

ngoi lc.Sn phm qu trnh p dng cho ngnh tuyn khong c dmax 25mm. Tu theo mc s dng ca cc h tiu th m c quy nh cth cho c ht ln nht cn s dng. Cc qung ln nht cp vo khunghin c khch thc ti u l:

Cp liu cho my nghin thanh: 20 30 mm.Cp liu cho my nghin bi: 15 20 mm.

3. Mc p.Mc p I l t s gia ng knh ln nht ca vt liu trc khi

p v ng knh ln nht ca vt liu sau khi p.Dmax

I = ----------dmax

Trong : Dmax: ng knh ln nht vt liu trc p.dmax : ng knh ln nht vt liu sau p.

Khi p th: I1 = 4 6 ln.Khi p va: I2 = 8 10 ln.Khi p nh: I3 = 3 8 ln.

* Mc p chung: L t s gia ng knh ln nht ca vt liuu tin trc khi p v ng knh ln nht ca vt liu cui cng sau

khi p.


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DmaxI = ---------- = I1 x I2 x I3

dmax

V d: Qung trc khi cp vo my p hm PE 400x600 ckch thc ln nht l 350 mm. Sau khi qua khu p th thu c

qung c kch thc ln nht l 50 mm. Tnh mc p chung ca khup th.

Mc p ca khu p th khi l:i = 350 / 50 = 7 ( ln ).

4. nh ngha sng.Sng l mt qu trnh phn chia hn hp vt liu thnh cc cp

ht khc nhau c kch thc v t l xc nh.Hiu sut sng l t s gia nng sut thc t ca sng vi nng

sut cp liu cho sng v hm lng c ht ( -a ) mm cn tnh c tnhtheo cng thc sau :

qtE = --------- , %.

Q.-a

Trong : qt - Nng sut thc t ca sng ( t/h)Q - Nng sut cp liu ca sng ( t/h ). -a- Hm lng cp ht ( -a ) mm, %.

* Hiu sut sng thng dng:Sng song dng cho p th: E -a = 60

70%.Sng chn ng dng p va v p nh: E -a = 80

85%.

5. Giai on p v s p.Mi khu p thng km theo sng s b hoc sng kim tra

v c gi l giai on p. Tu theo c ht c th m ngi ta c thb tr mi khu p c th l mt hoc nhiu my p v i kmc th l mt hoc nhiu sng.

V d: Trong khu p sng ca X nghip st Ba Hn cchia lm 2 giai on p l:

- Giai on p th: p h dng my p hm PE 400x600.


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- Giai on p nh: p h dng my p hm PEX 150x750 vsng chn ng 2CZZ900x1800.

6. Cc phng php p.

C 5 dng p khong sn gm: p v, un v, xit v, ct, pc th hin bng cc hnh v sau:

A B

C D E

Trong :A- Dng p v. B- Dng xit v. C- Dng ct v.

D- Dng un v. E- Dng p v.

Bi2. Cu to v nguyn l lm vic ca my p hm

y chng ti trnh by cu to v nguyn l hot ng camy p hm c hm ng lc n gin.

1.Cu to nguyn l.

IV5

8I III

2 117


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4 II1 6 10

3 9

Trong: 1- Thn my 4- Cu to hp kim bov hm

2- Hm tnh 5- Trc truyn ng lchtm

3- Hm ng 6- Tm chng.7- Nm iu chnh khe h tho ti.8- Bu lng gi tm chng.9- L xo gim chn. 10- Thanh tm chng.

11- Tm chn

S vng quay ti u ca trc lch tm c xc nh theo cngthc:

182,6

Nt =-------- , ( vng / pht ).BTrong : B: Chiu rng ca cp qung.

2. Nguyn l hot ng.Qu trnh p vt liu din ra trong khong trng gia hm

tnh v hm ng. Do hm ng chuyn ng lc i lc li c chuk ( hm ng c gn vi trc lch tm ca my ).

K hiu qu trnh chuyn ng ca trc lch tm nh hnh v:

IV

I III


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II

Khi trc lch tm quay t im I II th c phn trn v phndi ca hm ng ra xa hm tnh ng vi giai on cp liu ng thi

tho ti. T im II III phn trn ca hm tip tc ra xa nhng phndi tin li hm tnh l qu trnh phn trn cp liu cn phn d i pvt liu. T im III IV c phn trn v phn di tin li hm tnhth c hm p vt liu. T im IV I phn trn ca hm ngtip tc tin li gn hm ng nhng phn di ca hm ng li ra xahm tnh l qu trnh tho ti

Hm ng chuyn ng nh vy khng ch to ra lc p m cnto ra lc xit v lc ma st hng xung pha di to cho qu trnh p

v tho qung d hn.3. Nng sut ca my p hm.

Nng sut ca my p hm c xc nh theo cng thc sau:

60.n.( 0,135.B0 + 0,003645. B )Q = ---------------------------------------- , ( m3 / h ).

B . L

Trong : B0 - Chiu rng khe tho ti ng vi lc hm nggn hm

tnh nht.B - Chiu rng ca cp liu.L - Chiu di ca cp liu

4.S dng my p hm.S dng my p hm theo quy trnh vn hnh my vi mt s

bc chnh sau:* Trc khi lm vic :+ Phi kim tra xem trong my c cn qung hay khng. Cm

m my khi cn qung trong my.+ Kim tra tnh trng thit b : Che chn ca bo him, r

ca cc ai c, khp ni, mc du m bi trn , kch thc ca thoqung ... nu m bo cc yu cu k thut mi c vn hnh my.

* Trong khi lm vic :+ Vn hnh my tun theo quy trnh cng ngh.+ Khi my lm vic n nh mi c cp qung.+ Phi thng xuyn theo di tnh trng hot ng ca my. Nu

nghi ng, pht hin my c s c phi dng my ngay s l.


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+ Trong khi my lm vic nghim cm cp liu cho my qu quynh, b v tr lm vic, ngi vn hnh my khng thc hin dng cbo h lao ng....

* Sau khi lm vic :+ Ch c dng my khi trong my khng c qung Dng my

tun theo qui trnh cng ngh .+ kim tra li tnh trng thit b, dn v sinh cng nghip v ghi

s giao ca tnh trng thit b, tnh trng qung s dng.

Bi 3 Sng s dng trong xng tuyn.

1. Phn loi sng:Cn c vo nhim v ca qu trnh sng ngi ta chia sng thnh 5

loi sng:- Sng c lp l qu trnh sng chun b nguyn vt liu trc

tip cho cc h tiu th.- Sng chun b dng to c ht thch hp cho cc khu sau.- Sng h tr nhm mc ch nng cao hiu qu cho cc my.

Thng s dng trong khu p sng.- Sng tuyn dng tch vt liu u thnh sn phm sch v sn

phm thi.- Sng kim tra dng kim tra ht ca cc my p.- Sng kh nc dng lm gim lng nc trong sn phm.

2.Loi sng dng trong Nh my:Nh my ang s dng sng chn ng trn.

Cu to nguyn l

4 5

1 2 3


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1- Li sng2- Pu ly3- L xo gim chn4- ng c5- Khung sng- Gc nghing ca sng

Bi 4. Cc yu t nh hng n nng sut p vsng

1. Cc yu t nh hng ti nng sut p.- cng ca vt liu u: Vt liu c cng cng cao th

nng sut p cng gim.

- Thnh phn c ht ca vt liu p: Vt liu c t l c ht lnnhiu th nng sut p cng gim.- m ca vt liu u: Vt liu c m cng cao th nng

sut p cng gim. Nu vt liu c m xp x dnh kt thcn phi ra qung hoc sy kh trc khi p mi c hiu qu.

- B mt tip xc ca vt liu vi b mt hm nghin: Khi bmt tip xc ca vt liu vi b mt hm nghin cng ln th nngsut p cng tng.

- Tc quay: Nu tc quay ca ca my nh th nng sut

gim. Cn tc quay ca my ln hn tc quay ti u th nngsut cng gim. Tc quay tti u c tnh theo cng thc sau:

182,6+ Vi my p hm: Nt = ----------- , vng/ pht

BTrong : B - Chiu rng ca cp liu, (m).

300

+ Vi my p cn: Nt= ----------, vng/ pht DTrong : D- ng knh y nn ng, (m).

2. Cc yu t nh hng n qu trnh sng.- nh hng bi tnh cht vt l ca vt liu em sng.- nh hng bi thnh phn c ht em sng- nh hng bi hnh dng ht vt liu em sng.- nh hng bi m vt liu em sng.

- nh hng bi tnh kh d vt liu em sng.


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- nh hng do cp liu vt liu em sng.- nh hng do cu to sng nh c tnh chuyn ng ca li

sng, hnh dng l li, dc ca sng, tn s v bin dao ngca sng.

- nh hng bi hiu qu lm vic ca cc thit b i km sng .

Bi 5. Cc thng s chnh cn kim tra v iu chnhvi khu p sng.

C mt s thng s chnh sau cn kim tra v iu chnh vikhu p sng :

1. Kim tra vt liu a vo khu p sng .1.1. Kch thc c ht trc v sau my p:

* Nu vt liu em p c kch thc ln hn kch thc ca cpliu th my p khng lm vic c. C ht vt liu trc khi p nuln hn kch thc ca cp liu th phi c a i s l trc khi cpvo my p. Yu cu kch thc qung a vo p l: dmax < 0.85 B,( B- chiu rng ca cp liu ).

* Kim tra sn phm my p th:- Nu c ht sau my p ln hn thng s quy nh th cn

iu chnh kch thc ca tho my p ( gim kch thc khe tho snphm ) v ngc li Nu c ht sau my p nh hn thng s quy nhth iu chnh kch thc ca tho my p ( tng kch thc khe thosn phm ).

- tng hoc gim nng sut my p th c th iu chnhtng hoc gim kch thc ca tho sn phm p song khng vt quthng s quy nh.

* Kim tra sn phm qu trnh sng : Sn phm sng phi mbo yu cu quy nh .1.2. Kim tra c tnh qung em p :

* Kim tra s b hm lng qung, dng qung em p chng iu chnh cng ngh tuyn thch hp .Yu cu hm lng qungnguyn khai > 15 % st t,Thnh phn qung Hematit < 15 %.

* Kim tra m qung, kch thc qung em p kpthi iu chnh my p, ht qung em p th < 350 mm.

2. Kim tra tnh trng thit b trong khu p sng.i vi cc my p th, p nh

2 - Kim tra kch thc ca tho qung ca my p th , p nh.

- Kim tra mi mn hm p ca cc my p.


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- Kim tra cc bu lng gi hm, chn b- Kim tra h thng bi trn, hp gim tc- Kim tra cc h thng in nh thit b ng ct, dy ai- Kim tra cc h thng khp ni truyn chuyn ng.- Nu khng m bo cc yu cu k thut t ra phi iu

chnh, sa cha thay th.

3. Kim tra i vi sng v cp liu.- Kim tra kch thc l li sng xem c m bo quy cch khng.- tng nng sut sng th gim gc nghing sng so vi phng

ngang.- gim nng sut th tng gc nghing ca sng so vi phng

ngang.- Kim tra ti ( n ri ) ca vt liu em sng.

- Kim tra chn ng ca sng xem c m bo yu cu khngnu khng m bo th thay th ngay.* i vi sng dng cho khu p nh v li di ca sng khu

p va c bit phi ch trng n kch thc l sng v gcnghing ca sng c ht di sng lun m bo ng quy nhcp cho khu nghin.

4. Thng s kim tra vi my p nh.- Kim tra c ht cp liu nu c ht c kch thc ln hn kch thc

ca cp liu th phi iu chnh gim kch thc c tho ca myp th. Nu kch thc vt liu cp liu qu nh th c th iuchnh bng cch nng gc nghing ca sng trc n ( nu c sng )hoc tng kch thc ca tho ti ca my p th.

- Kim tra c ht ln nht sau my p t c th iuchnh khe tho ti ca my p t c th tng hoc gimnng sut.

* khu p sng lm vic c hiu qu th cc thng s trncn thc hin theo ng quy chun thit k. Khi mt trong cc thit

b trn c yu t no khng quy chun th c th iu chnhtrc tip thit b hoc thit b trc n hoc thay th chi tit nhhng n hiu qu thit b.5. Kim tra nng sut khu p sng.

* C 2 cch xc nh nng sut khu p sng:- Dng chuyn dng ct sn phm sau khu p trong

mt khong thi gian nht nh sau cn trng lng v chiacho thi gian o sau nhn vi thi gian ca 1 gi th xc nh -c nng sut khu.


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Q = 3600.q, t/h.Trong : Q- Nng sut khu p sng, t/h.

q- Trng lng vt liu o c trong 1 giy, t/s hockg/s.

- Cn trng lng ca 1 m bng ti sau khu p sau nhn vitng chiu di bng ti chy c trong 1 gi th cng xc nh cnng sut ca khu p.

Q = p. l , t/h.

Trong : Q - Nng sut khu p sng, t/h.p - Trng lng vt liu trn 1 m bng ti, ( t/m ).

l- Tng chiu di bng ti chy c trong 1 gi, m.

Chng III : Qu trnh nghin - phn cpBi 1. Qu trnh nghin Phn loi my nghin.

1. nh ngha qu trnh nghin.Nghin l qu trnh gim kch thc ca vt liu nh ngoi lc tc

dng, nhm mc ch gii phng khong vt c ch ra khi cc kthch v lin tinh t . Sn phm qu trnh nghin phi t < 1,5

mm .2. Phn loi my nghin.

* My nghin hnh tr quay bao gm.+ My nghin bi tho qua li.+ My nghin bi tho qua gia.

+My nghin thanh.Trong phm vi cun sch ny s trnh by cu to, ch lm

vic ca my nghin bi tho qua li.

3. Cu to my nghin bi tho qua li.Nhn chung my nghin bi tho qua li.* Cc im phn bit gia hai loi my nghin l:- My nghin bi tho qua li: Pha u tho c t cc li

chn bi nghin v cc ht vt liu cn ln khng chy ra ngoi.Cu to ca my nghin bi tho qua li:


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7 8 9

1 23

4

5 6Trong : 1-Tang nghin. 2- Tm lt nghin

3- Li tho sn phm 4- B mt lp ghp.5 -Tm ngn vt th nghin. 7- Tip liu

6 - L iu chnh mc bn. 8- Gi my. 9- Bnh rng truyn ng

Bi 2 . Mt s thng s k thut ca my nghin bi.Ch lm vic ca my nghin bi

1. ng hc ca qu trnh nghin.Tc quay gii hn ca tang nghin oc xc nh theo cng

thc:ngh = 42,3 D ( vng / pht ).

Trong : D - l ng knh pha trong ca tang my.

2. Ch bi trong my nghin.Trng lng ca m bi trong my nghin c quy c nh sau :- i vi mi loi my nghin ngi ta quy nh mt cch chnh xc

trng lng, thnh phn ca bi trong my, nhm m bo sn phm

sau nghin t yu cu k thut.


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- Mc cht y ca bi trong tang nghin hp l nht, thngthng l 42 - 45% th tch tang nghin. Ty tng loi my ch to ngita quy nh c th mc cht y bi trong tang nghin.

- i vi khu nghin th ngi ta thng cp cc loi bi to(70120 v c chia lm 4 -5 loi kch c khc nhau ).

- i vi khu nghin mn ngi ta thng cp cc loi binh(3070 ).

- B bi cho my nghin: Sau mt thi gian nghin th trng lngca m bi s gim i, do ngi ta phi b bi cho my. Vic b bi chomy phi m bo trng lng, t l thch hp . Vic b bi hp l phigii quyt c hai nhim v: + Xc nh thnh phn ht m bikhi cha b.

+ Vic b bi trong thc t c cn c vo mc tiuhao ca bi trn mt tn qung nguyn khai.Thng thng h s mi

mn c tnh l 1,1 1,6 kg/tn QNK.

3. Cc yu t nh hng ti qu trnh lm vic ca my nghinbi.

- cng ca vt liu u: Vt liu c cng cng cao thhiu qu nghin cng gim.

- Thnh phn c ht ca vt liu u: Vt liu u c t l c htln nhiu th hiu qu nghin cng gim.

- m ca vt liu u: Vic xc nh m ca vt liu

u thng mt thi gian th mi c kt qu chnh xc do vy viciu chnh nc cho my nghin thng gp kh khn hn.

- Tc quay: Nu tc quay ca ca my nh th hiu qugim. Cn tc quay ca my ln hn tc quay ti u th hiuqu cng gim.

* Tc quay tti u c tnh theo cng thc sau:

ngh 42,3 D , ( vng / pht )

* Thng thng ngi ta ly tc quay xp x bng tc quaygii hn.- ng u ca cp liu: Nu cp liu khng u th hiu

qu nghin cng km.- Yu t thit b cng nh hng ln n hiu qu nghin nh :

Kiu my nghin, hnh dng tm lt rut nghin, cu to ca tho ti,t l cht y bi trong my nghin, hiu qu lm vic ca cc thitb lin quan nh phn cp, thit b cp liu...

4. Ch lm vic ca my nghin.


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Trong my nghin vt th nghin chim 45% th tch tangnghin. Khi nghin quay th trng tm ca m bi b lch i. Nu gin l tc quay ca tang nghin th ta thy:

+ Nu n tng th mt s bi nghin s bay theo qu o nhtnh.

+ Nu n cng tng th ton b bi s quay cng tang nghin do s khng nghin c qung.

+ Nu n gim th mt s bi s trt trn tang nghin v nu ncng gim th ton b bi s trt trn tang nghin.

Chnh v vy ta xc nh c 03 ch lm vic ca bi nghin,c th hin theo cc hnh v sau:

Ch trt Ch ri Ch trunggian

T phng trnh cn bng gia lc ly tm ca m bi khi tangquay v trng lc ca m bi ta tnh c s vng quay ca tang nghintheo cng thc sau:

30 x 2n = -------------------- x cos .

D

Trong : D L ng knh trong ca tang nghin, - L gc gia m bi vi phng thng ng.

Bi 3. Nng sut, s dng v bo dng my nghin.

1. Nng sut my nghin.


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Vic tnh nng sut my nghin ch yu da vo cc iukin thc t ( da vo my nghin chun ) v c xc nh theocng thc:

Qq = Ki x Kk x KD x K x q1 ; ( T/ m3h )

Trong :Ki: H s tnh ti s khc nhau gia tnh chu nghin ca qungmu v qung i tng. Ki = Kp = 1 khi cng i tng qung. Khikhc i tng qung th phi ni suy t Kp ( tra bng trong giotrnh thit k tuyn khong tm Kp ).

V d: Qung mu l qung mm ( Kp = 1,5 ) ; qung i tngl qung cng ( Kp = 0,75 ); khi : Ki = 0,75/ 1,5 = 0,5.

Kk: H s tnh ti s khc nhau gia ht cp liu v mnnghin ca qung mu v qung i tng. ( tra bng trong gio trnh

thit k tuyn khong ).Kp: H s tnh n s khc nhau gia ng knh my nghinmu v ng knh my nghin ang tnh ( tra bng trong gio trnhthit k tuyn khong).

K: H s tnh ti s khc nhau gia kiu my nghin mu vmy nghin ang tnh ( tra bng ). ql: Nng sut my nghin mu( tiu chun ).

2. S dng v bo dng my nghin.Vic s dng my nghin cn phi tun theo cc nguyn tc

sau:2.1. Trc khi lm vic:

Cn kim tra tnh trng thit b ( Cc chi tit che chn, bohim, d ca cc ai c, khp ni, bng rng, tnh trng du bitrn), tnh trng qung cp liu ( ht, m , hm lng )2.2. Trong khi lm vic:

- Ch c vn hnh my khi my m bo yu cu k thut ra .Chy my theo s dy truyn cng ngh. Khi my chy th chomy chy n nh mi c cp liu.

- Trong khi lm vic nu my c s c th phi dng ngay sa cha. Trng hp my dng t ngt do s c th phi ngng tonb cp liu cho my.

- Phi cp liu lin tc, u, cho my khi my chy.- Khi my ang chy khng c cp bi bng tay hoc cc dng c

khng cho php. Ch c cp bi khi my dng hoc bng cc dngc chuyn dng gn sn c cu cp bi.

- Khi my chy khng c ng gn tang quay ca my, khng -c sa cha my.


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- Nghim cm b v tr lm vic, s dng cc cht kch thch khivn hnh .2.3. Sau khi lm vic.

Trc khi ngng my phi ngng cp liu trc. Sau cho my chy5 10 pht mi c dng my, ct cu giao in.V sinh , ghi s

giao ca bo co tnh trng thit b, qung s dng trong ca.Bi 4 : Qu trnh phn cp.

1. nh ngha:Phn cp l qu trnh phn chia hn hp cc ht qung thnh

cc cp ht qung khc nhau. N cng ngha vi qu trnh sng. Ngoivic phn chia theo ht n cn phn chia theo khi lng ring,hnh th ht.

Vt liu a vo phn cp gi l vt liu u. Sn phm c kchthc ln, khi lng ring ln gi l sn phm ct. Sn phm c kch thcnh gi l sn phm bn.

Vt liu u

Phn cp

Bn Ct

2. Chc nng ca qu trnh phn cp.- N c th l mt khu sn xut c lp nh ra than, st trong

phn cp ht ln.- C th l mt khu chun b.- C th l mt khu ph tr nh phn cp vt liu ct em

nghin li.

3. Phn loi thit b phn cp. phn cp c th dng 2 loi thit b l: my phn cp c gii

v my xoy lc.* My phn cp c gii hay dng nht l my phn cp rut

xon. N c u im l chi ph in nng thp, c th phn cp thhn, t phi sa cha. Nhng nhc im ca n l kch thc ln, chimnhiu din tch.

* My phn cp xoy lc c u im cu to n gin khng cb phn truyn ng do d ch to v chi ph s dng thp. Loi

ny dng phn cp c ht nh rt tt. Tuy nhin my c nhc im


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cng ty khong sn Lao Cai Tuyn khong i c-ngl chi ph in nng cao do c bm. Khi phn cp th c my xonlc v bm u chng mn.

Vi nhng u nhc im trn ca hai my, trong thc t ngi ta sdng nh sau:

- Phn cp giai on nghin I ngi ta dng phn cp rut

xon, cng c khi dng phn cp xon lc.- Phn cp giai on II ngi ta cng dng my phn cp rut

xon nhng nu s lng my nhiu v chim nhiu din tch th ngita dng my xoy lc.

- Phn cp giai on nghin b xung ( rt mn ) ngi ta thngdng my xon lc.

S nghin phn cp 1 giai on:

Nghin

Phn cp

Ct hi

Tuyn4. Cc yu t nh hng ti qu trnh lm vic ca my phncp.

- nh hng bi ng knh ca my phn cp.- nh hng bi thnh phn cp ht cp vo my phn cp.

- nh hng bi lu lng cp vo my phn cp.- nh hng bi hm lng rn c trong cp liu ca my phn cp.- nh hng bi gc nghing ca my phn cp.- nh hng bi cu to ca my phn cp nh kiu kiu my phn

cp.-nh hng bi kch thc ca tho ct, tho trn ca my phn cp.- nh hng bi hm lng rn c trong tng sn phm ca my phn

cp.


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- nh hng bi thnh phn cp ht trong tng sn phm ca myphn cp.

Bi 5. Cu to v nguyn l lm vicca my phn cp rut xon.

1. Cu to:

10 9

43

4 5 62

2

71 8

(

Trong :1- Thn my 2- Trc phn cp 3- Cnh xon4- Gi trc 5- Ca cp liu6- Ngng trn7- Ca tho ct 8- Ca x y9- C cu nng h trc phn cp10- B phn truyn chuyn ng cho trc phn cp.

2. Nguyn l lm vic ca my phn cp.Bn qung c cp vo my qua ca cp liu 5. Do my t

nghing nn bn qung chy v pha ngng trn 6. Nhng ht c kchthc ln hn kch thc ht ranh gii s chm xung y my v c cnhphn cp 3 a dn ln u my v tho qua ca tho ct 7. Cnnhng ht c kch thc nh hn ht ranh gii theo dng bn trn qua


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cng ty khong sn Lao Cai Tuyn khong i c-ngngng trn 6 vo ca tho trn 8 sn phm qua ca tho trn 8 l snphm bn.

Bi 6. Cc thng s chnh cn kim tra viu chnh vi khu nghin phn cp.

1. Cp liu cho my nghin, mc cht y bi trong my:- Nu tng cp liu my nghin th nng sut my nghin tng

ng thi nng sut c khu nghin phn cp cng tng theo. C htsau khu nghin s th hn.

- Nu gim cp liu my nghin th nng sut my nghin gimng thi nng sut c khu nghin phn cp cng gim theo. C htsau khu nghin s mn hn.

- Nu tng hoc gim qu cp liu cho my nghin th khunghin phn cp lm vic u khng c hiu qu. Chnh v vy yucu cp liu cho khu nghin phn cp phi lun m bo yu cuquy nh v lin tc, n nh th my lm vic mi c hiu qu.

- Vi XNst Khe Lch phi m bo cp liu >6 t/h/1 h.-Mc cht y bi trong my nghin : Mc cht y bi t 40 45

% th tch my .Thng thng h s mi mn bi nghin (Chi ph binghin ) c tnh l 1,1 1,6 kg/tn QNK. Cn c vo s tn qungnguyn khai s dng m ta c nh hng cp bi cho my mtcch hp l nht.

2. Kch thc c ht ln nht cp vo cho khu nghin - phncp.

- Nu tng kch thc c ht cp vo khu nghin phn cp thnng sut khu nghin phn cp s gim, tng thi gian nghin.

- Nu gim kch thc c ht cp vo khu nghin phn cp thnng sut khu nghin phn cp s tng v gim thi gian nghin.

- Kch thc ht ln nht cp vo my nghin ca X nghip : 20mm

3. Ch nc.- Nu cp tng nc vo khu nghin phn cp th hm lng cht

rn gim ( bn qung long hn ) do vy hiu qu tuyn khng caosong bn qung mn hn.

- Nu cp gim nc vo khu nghin phn cp th hm lngcht rn tng ( bn qung c hn ) tng nng sut tuyn nhng lilm gim cht lng sn phm.

- Do vy phi n nh lu lng nc thch hp.


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cng ty khong sn Lao Cai Tuyn khong i c-ng5. Kim tra hm lng cht rn trong bn qung, mnnghin ca khu nghin phn cp :5.1. Kim tra hm lng( Nng ) cht rn trong bn qung :

- Kim tra hm lng cht rn sau khu nghin phn cp cthc hin bng vic kim tra hm lng rn ta bn trn my phn cp

hoc ca cp liu ca thng khuy. Hm lng cht rn sau khunghin phn cp a vo khu tuyn t l28-33%.

- Nu hm lng cht rn nh hn 28% th gim lng nc cp vou ra ca my nghin.

- Nu hm lng cht rn trong bn qung ln hn nhiu so vithng s thit k th iu chnh tng lng nc vo khu nghin,vic iu chnh ny ch thc hin ti u ra khu nghin. Hm lngcht rn c xc nh theo cng thc sau:

- 1

R/L = --------- x 1,25 x 100 , (%).

Trong : - T trng bn qung, ( g/ cm3 ).1 - T trng ca nc.

T trng ca bn qung c xc nh theo cng thc sau:

M - Mb = -------------- , ( g/ cm3).

V Trong : M - Trng lng bn qung v b, ( g, Kg ).

Mb - Trng lng b, ( g, Kg ).V - Th tch bn qung o c, ( ml, lt ).

- Thng thng khi ta xc nh c hm lng cht rn nu thyhm lng cht rn thp hn quy nh th gim lng nc cp vo chon khi m bo yu cu mi thi. Nu hm lng cht rn cao hnquy nh th ta tng lng nc cp vo. iu chnh lng nc y chyu iu chnh lng nc cp vo u ra khu nghin. Thng s hm

lng cht rn phi c kim tra lin tc. Chu k kim tra gia 2 ln lintc phi t t 15 pht n 20 pht. Cng c th iu chnh ccthit b c lin quan nh : Phn cp rut xon m bo nng cht rn khu nghin phn cp.5.2. Kim tra hm lng cp ht 0,074 mm.

- Hm lng cp ht 0,074 mm c xc nh theo cng thcsau:

R1 R2

- 0,074mm = ------------- x 100 , (%).


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R1Trong :

( 1 1 ) . 2,1R1 = --------------------- ( Tnh trc khi ry).

3,1 . 1( 2 1 ) . 2,1

R2 = -------------------- ( Tnh sau khi ry).3,1 . 2

1, 1: Tnh tng t nh tnh .- Khi kim tra nu thy hm lng c ht - 0,074 mm thp hn

thng s quy nh th cn kim tra iu chnh my phn cphoc my nghin. Nu hm lng c ht - 0,074 mm vt qu ln so vithng s quy nh th c th iu chnh tng nng sut khu

nghin phn cp a hm lng c ht - 0,074mm v thng s quynh. Thng s hm lng cht rn phi c kim tra lin tc. Chu kkim tra phi t t 15 pht 20 pht / 1 ln kim tra.

- Thng s quy nh v hm lng c ht - 0,074 mm i vi Xnghip st Ba Hn l:

- Giai on nghin phn cp: 60 - 65 % c ht - 0,074 mm.

6. Kim tra tnh trng cc thit b khu nghin phn cp .- Kim tra tnh trng cc bu lng gi tm tp nghin, bu lng gi

lt nghin lun m bo kn kht, h thng tang, vung nghinkhng r r qung theo yu cu k thut t ra.- Kim tra h thng bi trn, lm mt ca cc bnh rng hp

gim tc, gi bc, bnh rng nghin m bo theo ng quy nh.- Kim tra cc khp ni truyn chuyn ng xem c m bo

yu cu k thut khng.- Kim tra cc h thng bm du, bm nc m bo yu cu k

thut khng b r r cc phn lp ghp.- Kim tra cc bu lng lp ghp phn tnh nh gi chn b

ng c, hp gim tc, gi bc m bo chc chn v kn kht.

Chng iV - Tuyn t

Bi 1. Bn cht ca phng php tuyn t.Khi nim v t trng v cng t trng.

1. Bn cht ca phng php tuyn t :Bn cht ca tuyn t l da trn s khc nhau ca t tnh ca

khong vt m t c th tch chng ra khi nhau.


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- My thc hin qu trnh ny gi l my tuyn t. Mytuyn t c c trng l ti vng lm vic to ln t trng. Khi a hnhp cc khong vt c t tnh khc nhau vo trong vng t trng camy th di tc dng ca lc t v lc c ( lc trng trng, lc ly tm,lc cn mi trng ) th cc ht khng t v c t chng s chuyn

ng khc nhau do vy c th tch chng ra khi nhau.- iu kin tch cc ht c t v cc ht khng t ra khi nhau

l: Lc t tc dng ln ht c t tnh phi ln hn tng cc lc c tcdng ln ht .

f (t) > f ( c ), ht c t.f (t) < f ( c ), ht khng c t.

2. Khi nim v t trng v cng t trng.2.1.nh ngha t trng.

L dng c bit ca vt cht m biu hin ca n l lc tcdng ln cc in tch chuyn ng trong t trng y.

T trng xung quanh nam chm vnh cu chnh l do tp hpcc dng nguyn t tn ti trong bn thn n.

T trng c biu hin bng cc ng sc t.2.2. Cng t trng.

L c trng cho mnh yu ca t trng v n chnh l lc tcdng ln mt n v t khi dng t trong t trng v c tnh bngcng thc sau:

F 0,2 iH = ------- = ------ , ( txtec, A/m,KA/m )

m r

Trong : m - T khi. 1KA/m = 1000 A/mr - bn knh hay khong cch t trng.I - Dng in.

2.3. Sc t ng: nh gi cng t trng ti vng lm vic ca my tuyn t

ngi ta dng sc t ng, k hiu l F, n v l CGSM (ghinbe).F = cng dch chuyn 1 n v t khi ring theo mt ngcong kn no c dng in chy qua.

- Nu cun dy c n vng th: F =0,4. . n . i , (CGSM)1 ghinbe = 0,8 ampe- vng = 1 txtet.

- Nu trong h SI:F = n . i ; 1 ampe - vng = 0,4 ghinbe = 1,25 ghinbe.

Bi 2. Lc t tc dng ln t trng.Tnh cht t ca khong vt. nh hng ca tnh cht

t ca khong vt n qu trnh tuyn t


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1. T trng ng nht v khng ng nht.- T trng ng nht l t trng m trong cng t trng

ging nhau c v tr s v hng v s bin thin.

- T trng khng ng nht l t trng m trong cng ttrng cc im khc nhau th khc nhau c v tr s, hng v sbin thin.

N N

S SKhng ng nht ng nht

- Khi t ht khong vt c t vo trong t trng ng nht thht ch chu tc dng ca m men quay nm sng sng vi ng sct.

- Khi t ht khong vt c t vo trong t trng khng ngnht th ngoi tc dng ca m men quay ht cn chu lc ht vpha cng t trng mnh hoc lc y v pha cng t trngyu. Chnh v lc ht v lc y ny ln c th tch chng ra khinhau. V vy qu trnh tuyn t ch chu tc dng ca t trngkhng ng nht v khi lc t tc dng ln ht l: F

= . H . gradH.Trong : - L h s t cm.

H. gradH - Lc t trng do my to nn.Nu k n h s t thm th:

F = . . H . gradH.n v tnh: Trong h SI l: N ( niutn )

Trong h CGMS l: uyn.1 N = 105 dyn.

* Khi ht khong vt c kch thc ln d > 25 mm th nhn h s l2. Cn nu d = 5 25 mm th nhn h s l 1,5 ln; nu d < 5 mm thnhn h s 1,1.

2. Tnh cht t ca khong vt2.1. Phn loi khong vt theo t tnh.

* Da vo tnh cht vt l chia khong vt thnh 02 loi:- Khong vt nghch t v khong vt thun t.- Khong vt nghch t l nhng khong vt khng c t tnh n

c h s t cm m. Khi t vo trong t trng th sau hin tng


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cng ty khong sn Lao Cai Tuyn khong i c-ngphm ng n sinh ra momen t ph chng li t trng to ra n v lmyu cng t trng ca my.

- Khong vt thun t c h s t cm dng nn khi t n votrong t trng n lm tng cng t trng bn ngoi .

* Da vo h s t cm chia khong vt thnh 03 loi:

- Khong vt c t tnh mnh: l khong vt c h s t cm lnhn 3,8 . 10 -5(m3/ kg ) nh qung manhtt, pyrotin. Cc khong vtc t tnh mnh c thu hi bng my c cng t trng ( H = 10802500 txtet ).

- Khong vt c t tnh yu l khong vt c h s t cm trongkhong 7,5 . 10 -6 1,26 . 10 -7 ( m3/ kg ).

- Khong vt c t tnh trung bnh l nhng khong vt c h st cm trong khong 7,5 . 10 -6 3,8 . 10 -3 ( m3/ kg ) nh qung st didng oxit nh chemtit, xirit, limrit. Cc khong vt loi ny c thu

hi bng my tuyn t c cng t trng H = 10000 - 20000 txtet.

3. nh hng ca tnh cht t ca khong vt n qu trnhtuyn t.3.1. nh hng ca h s t cm.

H s t cm l thng s quyt nh chn my tuyn. Nuh s t cm ln th chn my c cng t trng thp cn nu hs t cm thp th chn my c cng t trng cao.

Khi tuyn khong vt c h s t cm ln v kch thc ht khong

vt nh . Do c hin tng t d cho nn c hin tng b t dnh kt li vinhau v thng c hi cho sn xut. Khi tuyn khong vt ny nhtthit phi qua thit b t ho th thc thu tuyn mi tng ln.3.2. nh hng ca h s ng u ht.

Nguyn nhn v trong cng vng lm vic ca my th cng t trng H khng ng nht nn tu thuc vo cch cp liu th ccht khong s chu cc lc ht khc nhau. gim s ln ln ht khngt vo sn phm th cn phi phn cp vt liu ra tng cp ht hp .

Bi 3. Cc yu t nh hng ti qu trnh lm vic ca mytuyn t .

Nng sut khu tuyn t.

1. nh hng ca cng t trng.Cng t trng c nh hng rt ln n hiu qu sn sut

ca tuyn t. Khi tng hoc gim cng t trng th nng suttuyn cng nh hm lng tinh qung cng thay i theo.


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cng ty khong sn Lao Cai Tuyn khong i c-ng2. nh hng ca cc t.

Khi quay cc t theo chiu tng hoc gim ca cc t th nngsut tuyn v hm lng tinh qung cng thay i theo tu theochiu xoay cc t.

3 .nh hng ca khong cch cc t.Khong cch ca cc t c nh hng ln n hiu qu sn sut

ca tuyn t v hm lng tinh qung. Cc t cng cch xa mt tipxc ca bn qung th nng sut tuyn gim nhng hm lng tinhqung li tng. Ngc li khi cc t cng gn mt tip xc bn qungth nng sut tuyn tng nhng hm lng tinh qung li gim.

4. nh hng ca mt bn qung ( hm lng rn ).Khi tng mt bn qung th nng sut tuyn tng nhng hm

lng tinh qung li gim. Ngc li khi gim mt bn qung th nngsut tuyn gim nhng hm lng tinh qung li tng.

5. nh hng bi c ht a vo tuyn.C ht a vo tuyn cng ln th thu hoch tuyn tng nhng hm

lng tinh qung li gim. Ngc li khi c ht vt liu cng mn th thuhoc tuyn gim nhng hm lng tinh qung li tng.

6. nh hng bi nht mi trng.

Khi nht mi trng tng th nng sut tuyn t tng nhng hmlng tinh qung gim. Ngc li khi nht mi trng mi trng gimth nng sut gim nhng hm lng tinh qung tng.

7. nh hng bi kch thc ca tho sn phm tinh qung.Khi tng kch thc ca tho sn phm tinh qung th nng sut

tuyn tng nhng hm lng tinh qung gim. Ngc li khi gim kch thcca tho sn phm tinh qung th nng sut tuyn gim nhng hm l-

ng tinh qung li tng.

8. nh hng bi tc cp liu.Khi tng tc cp liu th nng sut tuyn tng nhng hm lng

tinh qung li gim. Ngc li khi gim tc cp liu th nng suttuyn gim nhng hm lng tinh qung li tng.9. nh hng bi tnh cht t ca khong vt.

Khong vt c t tnh cng mnh th nng sut tuyn cng tng,khi khong vt c t tnh yu th nng sut tuyn gim.

10. nh hng bi cu to my tuyn t.


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Cu to my tuyn t cng c nh hng n hiu qu ca tuynt nh cch b tr cc t, kiu my tuyn t kh hay tuyn t t, tuynthun dng hay bn ngc dng hay ngc dng.

11. nh hng bi nng sut cp liu.

Khi tng nng sut cp liu th nng sut tuyn tng nhng hm l-ng tinh qung gim. Ngc li khi gim nng sut cp liu th nngsut tuyn gim nhng hm lng tinh qung li tng.

12. nh hng bi tc quay ca my.Khi tng tc quay ca my th nng sut tuyn tng nhng

hm lng tinh qung li gim v ngc li khi gim tc quay ca myth nng sut tuyn gim nhng hm lng tinh qung li tng.

13. Cch xc nh nng sut khu tuyn t t. - Nng sut ca my tuyn t t c th tnh bng t /h hoc m3 /h.

- Nng sut ring ca my tuyn t t ( tnh trn 1 m chiu rngtang my ) c tnh bng:

Q=3,6 . V . H . b . P , t/m.h

Trong : H- Chiu cao vng lm vic.

P- Hm lng rn ca bn trong vng lm vicb- Mt ca bn, % rn.V- Tc trung bnh ca bn trong vng lm vic.

Ngoi ra c th tnh nng sut ca my tuyn t theo cng thc sau:

Qtq = tq. QNK

Trong : QNK- Nng sut cp liu, t/h.Qtq- Nng sut tinh qung, t/h.tq- Thu hoch tinh qung, %.

Bi 4. My tuyn t v phn loi my tuyn t

1. nh ngha.My tuyn t l my dng tch nhng khong vt c t ra

khi hn hp vt liu.


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cng ty khong sn Lao Cai Tuyn khong i c-ng2. Phn loi my tuyn t.

-Da vo cng t trng my c chia lm 2 loi l my c cng t trng thp v my c cng t trng cao.

- Da vo mi trng tuyn my tuyn t c chia lm 2 loi lmy tuyn t kh v my tuyn t t.

- Da vo phng php cp liu my c chia lm 2 loi l mytuyn t cp liu trn v my tuyn t cp liu di.

3. Cu to v nguyn l lm vic ca my tuyn t tang trngcp liu di bn ngc dng.3.1. Cu to:

1

5 3 246 7

89

10

6

114

12 13


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Trong : 1- Tang tuyn 2- Nam chm vnh cu3- Trc my 4- Ga 5- Ca cp liu6- Bu lng iu chnh khe h tho sn phm

7- L chn hng sn phm 8- Gi thng my

9- Mng hng sn phm tinh qung10- Mng hng ui thi 11- Chn gi thng

my12- Ca tho thi 13- Ca tho tinh qung

3.2. Nguyn l lm vic.Qung c cp vo ca cp liu 5 c dng nc p lc nh ti

v y n phn tip xc vi tang my tuyn 1. Nhng khong vtc t c nam chm trong tang my ht v c tang my a ln mnghng sn phm tinh qung 9 v c tho qua ca tho tinh qung 13.

Sn phm khng t c a sang mng hng ui thi v c tho thiqua ca tho ti 12.

Bi 5. Cc thng s cn kim tra v iu chnh khutuyn t

1. iu chnh cng t trng.Cng t trng ti u thu hi khong vt c xc nh bng

thc nghim. Khi my lm vic ngi ta ch iu chnh cng t tr-

ng trong khong ln cn gi tr ti u.- Tng cng t trng th s tng nng sut tuyn ng thi

qu trnh tuyn s khng c tnh l chn ln s lm gim cht lng snphm tc l hm lng tinh qung thp.

- Gim cng t trng th s gim nng sut khu tuyn ngthi n li c tnh la chn cao do vy s tng c hm lng tinhqung.

2. iu chnh tc cp qung vo my.

- Khi cp qung vo my phi m bo phn b u theo tangmy. Khi tng tc cp qung vo my th s tng nng sut tuynv tng b t do vy hm lng tinh qung s gim ng thi s tngtht thot khong vt c t ra theo ui thi.

- Khi gim tc cp qung vo my th s gim nng suttuyn v gim b t do vy hm lng tinh qung s tng ng this gim tht thot khong vt c t ra theo ui thi.

3. iu chnh tc quay ca tang my.


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Tc quay ca my s quyt nh cht lng ca sn phm. Khitng tc quay ca my th s tng nng sut tuyn ng thi cngtng t l tht thot khong vt c ch theo ui thi v cc khongvt nm xa cc t c th b vng ra v theo ui thi ra ngoi dovy tc quay ca my phi lun n nh gi tr ti u

4. C ht v tnh cht t ca khong vt em tuyn.Tnh cht t ca khong vt c t tnh ph thuc vo c ht. Gim

c ht th h s t cm ca khong vt s gim. Mt khc tnh chnring ca qu trnh em tuyn li ph thuc vo h s t cm cakhong vt. Bi vy nng cao hiu qu tuyn cn thit phiphn cp c ht em tuyn thnh cc cp ht hp sao cho t s c htln nht v nh nht khng vt qu h s ht ng u.

5. V tr ca l chn.Bng cch thay i v tr ca l chn c th thay i c cht

lng ca sn phm. Nu y v tr l chn ra xa ( tng kch thc kheh tho sn phm) th nng sut tuyn s tng ln nhng n li lmgim cht lng sn phm. Ngc li khi gim kch thc khe h th nngsut tuyn gim nhng li tng c cht lng sn phm. Nu kch thckhe h qu ln hoc qu nh th hiu qu tuyn u khng tt.

6. Mt bn.

Trong tuyn t t nu tng mt bn qung th s tng nngsut ca my v li lm gim cht lng sn phm t. Ngc li nu gimmt bn qung th s lm gim nng sut tuyn nhng li lm tngcht lng sn phm t. V vy mt bn cn phi hp l. Thng th-ng mt bn qung khi vo khu tuyn t l 20 25% cht rn.

7. Hm lng qung nguyn khai, hm lng tinh qung, hm l-ng ui thi.

Trong qu trnh vn hnh phi thng xuyn kim tra 3 loi hm l-

ng trn bng phn tch ho hoc bng phng php kinh nghim sosnh .Vi X nghip hm lng qung nguyn khai t 15 - 30 % Fe3O4,tinh qung st 60 % , ui thi 10 % .

8. iu chnh cc t.Trong qu trnh sn xut th hm lng qung nguyn khai em

tuyn hoc tinh qung ,nng sut c th b thay i do vy ngoicc bin php iu chnh trn ta c thc hin phng php iuchnh cc t bng vic xoay cc t sang mt v tr khc tc l thay

i b mt tip xc gia cc t v bn qung.


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- Nu xoay cc t theo chiu quay ca tang my th nng suttng nhng hm lng tinh qung gim.

- Nu xoay cc t ngc chiu quay ca tang my th nng sutgim nhng hm lng tinh qung tng.

Bi 6. Phng php lp bng cn bng kim loiv cn bng hng ho.

1. nh ngha v bng cn bng kim loi.Bng cn bng kim loi l cc bo co k thut v cht lng v s

lng phn xng tuyn trong khong thi gian nht nh. Nu khngtnh n mt mt c gii th bng cn bng kim loi c chia lm 2loi sau:Loi 1: Bng cn bng kim loi thc hin cho 1 ca sn xut.Loi 2: Bng cn bng kim loi thc hin cho 1 ngy m, cho 10ngy, cho 1 thng, cho 1 nm.

Mc ch ca vic lp bng cn bng kim loi l xc nhcc ch tiu cng ngh v t c th nh gi c hiu qu snxut cng nh iu chnh cng ngh cho hp l.1.1. Cc s liu ban u thn lp bng cn bng kim loi:9 - Khi lng vt liu u a vo tuyn.10 - m ca vt liu u v m cc sn phm thnh phm.11 - Hm lng kim loi ca vt liu u v ca cc sn phm thnh

phm.1.2. Cc phng php thnh lp bng cn bng kim loi:12 - Gm 1 bng trong c tn cc sn phm v tn cc ch tiu.13 - in cc s liu bit vo cc trong bng.14 - Tnh cc s liu cn li theo cc cng thc gii thiu phn u

v in cc s liu vo bng.

Tn sn

phm

Khi lng

( tn )

Hm lng ( % ) Kim loi

( tn ) Tinh

qungQTQ TQ TQ TQ PTQ

ui thi QT T T PTNguyn

khaiQNK 100 100 PNK

Trong : TQ + T = 100

TQ + T = 100


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QTQ + QT = QNKPTQ + Pt = PNK

2. Bng cn bng hng ho.Bng cn bng hng ho c chia lm 2 loi

Loi 1: Bng cn bng hng ho c thc hin cho 1 ngy, 1thng.

Loi 2: Bng cn bng hng ho thc hin cho 1 qu, cho 1 nm.2.1. Cc s liu ban u thn lp bng cn bng hng ho:

Khi lng v m ca vt liu u a vo tuyn.Khi lng v m ca cc sn phm thnh phm.Khi lng v m ca cc sn phm lu kho.Hm lng kim loi ca cc sn phm.

2.2.Phng php lp bng cn bng hng ho:

chnh xc ca vic lp bngcn bng hng ho ph thuc vo chnh xc ca vic ly mu v nh gi vt liu lu kho. Ta c:

Q1.1 = Q2.2 + Q3.3 + Q4.4 + + Qn.n

Trong :Q1.1 - Trng lng v hm lng qung kho cn tnh.Q2.2 - Trng lng v hm lng qung kho s 2.Q3.3 - Trng lng v hm lng qung kho s 3.Qn.n - Trng lng v hm lng qung kho s n.

Chng V : Ly mu v kim tracc ch tiu cng ngh tuyn.

Bi 1. Kha nim , mc ch v phn loi mu.

1.nh ngha.Ly mu gm hai giai on l giai on chn mu v giai on

gia cng mu. C ba phng php chn mu gm:- Chn mu h thng: Gm cc mu con c chn u theokhong thi gian hoc theo ng v tr trn ton b khi vt liu cnly. chn mu h thng c th dn n sai s h thng nghimtrng, nu c s thay i theo chu k v cht lng trong khi vt liucn ly.

V d: Khi ly mu qung tinh tuyn t xc nh hm lngng. Gi s c sau 1 gi ta chn mt mu n v c ng thiim hm lng st trong qung tinh li tng, sau hm lng st

trong qung tinh li gim. Nh vy mu c s chung cho c ca sn xut


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cng ty khong sn Lao Cai Tuyn khong i c-ngc hm lng st tng hn so vi thc t dn n sai lch nhiu, mukm chnh xc, tc l mu khng mang tnh i din cho khimu cn kho st.

- Chn mu ngu nhin: Cc mu con c chn mt cch ngunhin theo khong thi gian hoc v tr trn ton b khi vt liu cn

ly mu. Phng php ly mu ngu nhin c th s dng mu t ngho hoc mu th cng. Do vy cc ch tiu chun ly mu ch pdng trn nguyn tc chn mu h thng.

V d: Khi cn ly mu qung nguyn khai ng trn bng ti vikhi lng qung nguyn khai ng l 1000 tn th cn phi chn 32mu con. Nu qung nguyn khai c vn chuyn trong 4 gi ththeo cch chn mu h thng th cn 8 mu con, khong cch giahai ln chn mu l 7 pht , khi theo cch chn mu ngu nhin cth sau 5 pht ly mu th hai v mu th ba tip theo chn cch

mu th hai c th l 10 hoc 15 pht.- Mu c s: L mu c gp t ton b s mu n.

2. Mc ch ca vic ly mu.- L xc nh tr lng cng nghip ca m v thu nhn cc s

liu v thnh phn vt cht ca khong sn c ch v khng c ch t c nh hng cho vic khai thc v tuyn khong sau ny.

- Trong vic khai thc m ly mu v phn tch mu nhm mcch xc nh tnh ng n trong qu trnh khai thc tc l

thng qua kt qu ly mu v phn tch bit c hm lng t ln vo vtj liu nguyn khai a v xng tuyn trong qu trnh khaithc. Mt khc da vo cht lng khong sn khai thc c phn loikhong sn nguyn khai theo thanhf phn vt cht ca khong vt.

- Xc nh thnh phn vt cht ca vt liu u v ca snphm tuyn da vo kt qu phn tch mu c s ca ca, ngy,thng lp bng cn bng nh lng t nh gi c mc n nh ca qu trnh k thut, nh gi c cht lng lm vic catng ca, tng khu cng ngh hay tng loi my v thit b lm vic.

ng thi da vo kt qu ly mu v phn tch mu c c sthanh ton ti chnh gia xng tuyn v m v gia xng tuyn vh tiu th.

3. Phn loi mu.Da vo chc nng ca cc loi mu ngi ta phm mu thnh cc

loi mu sau:- Mu phn tch khong vt: L loi mu dng nghin cu s

b tnh kh tuyn i vi khong sn c ch, kt qu phn tch cho

bit hm lng gn ng ca cc khong vt c trong mu v xm


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cng ty khong sn Lao Cai Tuyn khong i c-ngnhim gi chng, ngoi ra cn xc nh c cng, nh, tnhcht t, tnh dn in, tnh thm t v cc tnh cht khc c sdng khi tuyn.

- Mu phn tch ho: Nhm xc nh thnh phn ho hc cakhong sn c ch. Da vo kt qu phn tch ho v nghin cu a

cht xc nh c tr lng cng nghip v gi tr hu ch ca chngvi ngnh cng nghip.Mu phn tch ry: Nhm xc nh thnh phn ht ca khi vtliu t c th i chnh ch lm vic ca cc khup,sng, nghin, phn cp, ng thi nh gi hiu sut phn cpca cc khu .

- Mu xc nh m: Nhm xc nh lng nc c trongkhi vt liu t tnh ra khi lng kh ca khi vt liu. Trn c s lp c s nh lng, s bn nc v bng cn bng hng

ho v lm c s thanh ton ti chnh gia xng tuyn vi xnghip v gia xng tuyn vi h tiu th.

- Mu phn tch chm ni: Nhm xc nh thnh phn t trngca khong sn c chv nhm kim tra sn xut i vi tng ca lmvic, nh gi hiu qu tuyn ca cc thit b tuyn trng lc. Ktqu ca vic ly mu phn tch chm ni l s liu u cho victhit k xng tuyn trng lc.

- Mu k thut: L mu dng nghin cu tnh kh tuyn,nghin cu cng ngh tuyn.

- Mu xc nh mt bn: L xc nh khi lng ring cabn. Mu xc nh mt bn ch yu ly sn phm nghin, bntrn my phn cp, sn phm tuyn ni v huyn ph chun trc khia vo my tuyn huyn ph.

- Mu xc nh hm lng pha rn: L loi mu nhm xc nhthnh phn cht rn c trong bn qung hoc trong khng kh, t c th nh gi lng mt mt phn rn v cht c ch vo snphm thi hoc kim tra cht lng nc tun hon, mc nhimmi trng khng kh chnh xc ca mu phn tch hm lng pha

rn ph thuc nhiu vo s mu n, s mu n cng nhiu th chnh xc cng cao.- Mu xc nh nng ion: Mc ch l xc nh nng

ion trong dung dch hoc trong bn c p dng vi xng tuynni. Vic xc nh ion l kim tra ch k thut c qu trnhtuyn nh kim tra PH, kim tra ion c hi cho tuyn khong, kimtra nng ion thuc tuyn ni trong bn v trong nc tun hon.

Bi 2. Phng php ly mu xng tuyn khong.

1. Phn loi mu.


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Vic ly mu trong xng tuyn khong c chia thnh 2 dng lymu l :

- Ly mu vt liu trng thi tnh, vt liu dng cc nh trongng, trong toa xe v vt liu dng mn nh vt trong kho, trong toa xequng tinh..

- Ly mu vt liu trng thi di ng nh vt liu dng cc v htnh c vn chuyn trn bng ti, trn mng hoc ch chuyn ti, vtliu dng nghin nh nh bn c vn chuyn trn mng.1.1. Ly mu vt liu ri trng thi tnh:

Khi ly mu vt liu ri trng thi tnh gm cc phng phpsau: Phng php xc, phng php chn mu bng ng, phng phpkhoan, phng php o h, phng php o ho, phng php phnon, phng php chia t. y chng ti gii thiu mt s phngphp chnh thng s dng.

* Phng php xc: T khi vt liu ri trng thi tnh ta chn nhng im ngu nhin hoc xc nh trc trn b mt khivt liu. Mi im cho mt mu n, hp cc mu n c mu cs. Khi chn mu bng phng php xc vt liu c chn vo munm su 20 - 30cm. Dng c xc l dng xng. Cch phn bim chn mu ( cc giao im ) nh hnh v.

* Chn mu bng ng: L dng ng n thng ng ( phng vung gcvi b mt ng vt liu ) n su yu cu no . Khi mu

c ly ra t trong ng. ng chn mu l mt on, thnh ng mng,s ly mu nh phn trn.* Chn mu bng phng php chia t: Ch p dng khi ng vt liucn ly mu nh v ch yu c p dng vo vic gin lc mu.

Cch ly mu c tin hnh nh sau: T ng vt liu ban ungi ta trn u ng vt liu sau vun thnh ng v dng tmphng n ng vt liu thnh hnh trn dng a ( mc ch khi vt liu cn ly mu khng bt ngf nht v chiu cao ). Tiptheo dng tm kim loi chia ng vt liu thnh 4 phn bng nhau v

ly hai phn i din vo nhau, sau tip tc li trn hai phn


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cng ty khong sn Lao Cai Tuyn khong i c-ngri li vun thnh ng v to ra khi vt liu dn a. tip tc lm t-ng nh trn cho n khi hai phn vt liu i din c khi lng tyu cu ca mu.

S chn mu bng phng php chia t nh hnh v:

1.2. Ly mu vt liu ri trng thi di ng:Ti mt thi im no trn dng chy lin tc ca vt liu, c

sau mt khong thi gian xc nh v u li chn mt phn cadng vt liu vo mu. Mi ln ly mt phn vt liu vo mu l mtmu n. Khi chn mu vt liu trng thi di ng th c 2 phngphp chn mu l chn mu bng phng php ct dc dng v chnmu bng phng php ct ngang dng.

- Phng php chn mu bng ct dc dng c thc hin nh sau:chia dng vt liu thnh nhiu dng nh khc nhau v song song nhau

theo chiu dng chy sau chn mu bng cch ct mt hoc mts dng vo mu. Phng php ny ch p dng khi dng vt liu ctnh ng nht theo mt ct ngang ca dng.

- Chn mu bng phng php ct ngang dng: C sau mtkhong thi gian xc nh ngi ta chn mt lng vt liu theo ton btit din ngang ca dng vt liu vo mu. Mi ln chn mu l mtmu n. y l phng php c chnh xc cao nht.2. Cc bin php v cc khu gia cng mu.2.1. Sy mu:

Mu ly t khi vt liu v bao gi cng cha mt lng nc. Nu l-ng nc trong mu cao s nh hng khi gia cng mu nh gy tc sng ,bt my p, kh trn u. V vy mu trc khi gia cng thng phisy kh.2.2. Gn loc.

Gn lc c p dng khi gia cng mu bn, mu bn sau khi khuyu, gin lc v phn chia ly mu phn tch ry , mu xc nhpH, mu xc nh mt bn phn cn li lng v a gn lc.2.3. p v nghin mu:


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Mc ch ca khu p nghin l chun b mu n ht no trc khi gin lc mu n kh lng ph hp vi yu cu thnghim hoc mt giai on khi gia cng gin lc mu.2.4. Trn mu:

Trn mu ngi ta s dng cc phng php nh: Xc chuyn, ph-

ng php vng xuyn - hnh nn, phng php ln o v phngphp c gii.

- phng php xc chuyn: c p dng vi mu c khi lng t vitrm kg n vi tn, kch thc vt liu trong mu phi nh 100 mm.Cch tin hnh nh sau:

Mu thnh ng trn nn xi mng, sau ta xc chuyn tng ny sang ng khc mt cch ngu nhin khng theo mt trnht no. Khi xc vt liu mu sang ng khc phi vt liumu vo gia nh nn cho cc ht kch thc ln ln u xung

quanh ng vt liu trnh hin tng bt ng nht v ht ccvng khc nhau.

- Phng php vng xuyn - hnh nn: c p dng vi khi lngmu nh hn 5 tn. ht vt liu mu nh hn 50 - 60 mm. Cchtin hnh nh sau:

Vt liu mu ban u thnh hnh xuyn sau ta i xungquanh vng xuyn xc vt liu vo gia xuyn to nn ( khito nn phi vt kiu vo gia nh nn ). Sau khi to nn xongdng tm kim loi p bp nn xung to a, mc ch gim bt

v ht gia nh nn v y nn. Khi c a ngi ta i xungquanh a xc dn vt liu mu ra xung quanh a toxuyn. c lm nh vy ba ln l c. Do c s khc bit v ht gianh nn v y nn nn phng php ny ch p dng dng cho ph-ng php gin lc chia t.

- Phng php ln o: c p dng khi lng mu nh hn 20 - 25kg v ht vt liu mu nh hn 20 mm. Cch tin hnh trn munh sau:

Trc tin mu vo nilon hoc vi bt sau trn u mu

bng cch cm mt gc vi hoc nilon nhc ln cao vt liu lnchm sang gc i din sau gc vi xung v cm gc vitip theo nhc ln nh ln trc vt liu ln chm sang gc i dinc lm nh vy khong 20 ln l c. Phng php ny cng thng sdng cho khu gin lc mu bng phng php chia t.

- Phng php c gii: p dng trn mu phn tch ho, khngdng trn mu phn tch ry v khi trn mu bng phng phpny th vt liu mu b v vn nhiu, nu dng phng php ny trn mu phn tch ry mu s khng chnh xc. lng mu dng

trn t 1 - 2 kg. Cch in hnh nh sau:


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mu vo my nghin th nghim, trong my khng c binghin hoc c mt vi vin. Cho my chy t 10 - 20 pht l c.

- Phng php phn on: Ni dung nh phn chn mu phnon.

- Phng php ct dc dng: Ni dung nh phn chn mu ct dc

dng.- Phng php chia t: Phng php ny c p dng khi mu c

trn u bng phng php vng xuyn hnh nn. Ni dung phngphp ny nh phn trn.

- Phng php k vung: L sau mi ln trn u ngi ta tri vtliu u trn mt phng sau k vung v ln lt ly mu ccim gia hoc cc nt mng cc vung. Phng php ny sdng vi vt liu nh hn -1 mm, S nh hnh v:

. . . . .

Bi 3. T chc ly mu xng tuyn khong.

1. Nhim v cng tc ly mu.Trong phn xng tuyn khong c mt b phn ly mu kim tra

cht lng sn phm gi l KCS. Phng tin ca KCS l ly mu vphn tch mu. thc hin chc nng gim nh hng ngy, bphn KCS c cc nhim v sau:

Chn mu, gia cng mu v phn tch mu hoc c th gimu i ni khc phn tch mu, phn tch nh gi cc kt qu thuc qua ly mu v phn tch mu, pht hin nhng sai st vmt k thut cng nh v qun l trong iu hnh sn xut, t

ra nhng phng php ngn chn nhng vi phm i vi quytrnh cng ngh

2. c im ly mu.Cng tc ly mu ti phn xng tuyn khc vi cng tc ly mu

m v cc khong sng cc im sau:- Vt liu di chuyn lin tc do nu vi phm quy trnh ly

mu s khng ly c ln 2.- Vt liu thng c p nh trc khi tuyn nn thay vic ly mu

vt liu u bng vic ly mu sau khu p c chnh xc cao.


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- im v v tr ly mu trong qu trnh lm vic l c nh, t vic ly mu ti phn xng tuyn c chnh xc cao hn, d tng ho v c gii ho cao hn.

3. Cc mu thng ly.

3.1. Ly mu ho vt liu u.Khi ly mu ho vt liu u c th ly ti cc im nh ly ti

toa xe, ly ti sn phm p ca khu p nh, ly ti sn phmnghin ca khu nghin. Thng thng ngi ta hay ly mu ti snphm khu nghin ( bn trn my phn cp ). u im ca phng nny l d c gii ho v t ng ho khu chn mu, tn t cng giacng mu, chnh xc ca mu cao hn so vi cc phng n trn.3.2. Ly mu sn phm thi.

c im ca sn phm thi xng tuyn khong thng c

ht nh mn, nguyn t c ch thng c phn b tng i ngu mi cp ht v mi v tr nn s mu n gim. Tu theo s cng ngh m chn v tr ly mu. Khi xng tuyn c mt hthng nn t thit b chn mu sn phm thi trn ng vnchuyn trcs khi ra bi thi. Khi xng tuyn c nhiu sn phmthi ( nhiu h thng ) th t thit b chn mu ly mu ringcho tng sn phm thi.3.3. Ly mu sn phm thnh phm.

c im sn phm sch thng c ht nh mn nn cho php

ly s mu n v khi lng mu n nh. Cn ly mu lp bngcn bng kim loi v bn cn bng hng ho ring. Khi ly mu lpbng cn bng kim loi th v tr chn mu sn phm sch l dngsn phm vn chuyn vo thit b kh nc. Khi ly mu lp bng cnbng hng ho th chn v tr ly mu l dng sn phm trc khi xutxng.3.4. Ly mu phn tch m.

Cc mu xc nh m phi chn vo lc cn sn phm, nuchn mu trc hoc sau khi cn sn phm s lm sai lch khi lng

kh ca sn phm ( do nc bay hi hoc ht m ca vt liu ).3.5. Ly mu phn tch hm lng rn.Mu phn tch hm lng rn c th ly ti v tr bn trn ca

my phn cp nu l xc nh hm lng rn cho khu nghin phncp. xc nh hm lng rn cho cc khu khc th chn v tr lymu l dng bn cp vo u khu .3.6. Ly mu phn tch hm lng cp ht.

Mu phn tch hm lng cp ht c th ly ti v tr bn trn camy phn cp nu l xc nh hm lng cp ht sau khu nghin

phn cp. xc nh hm lng cp ht cho cc khu khc th chn


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cng ty khong sn Lao Cai Tuyn khong i c-ngv tr ly mu l dng bn cp vo u khu nh gi c htcp vo cho khu v nh gi hiu qu lm vic ca khu trc .

Cng ho x hi ch ngha vit namc lp T do - Hnh phc

Lo cai, ngy 26 thng 07 nm 2008

Bo co kt qu sau thi gian cn chnh thit b chy lin ng c tiv chnh nh cng ngh tuyn manhetit


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- Cn c vo bin bn lm vic gia Cng ty khong sn Lo Caiv nhm k thut Cng ty M tuyn ng Sin Quyn ngy/6/2008.

- Cn c vo phng n chnh nh Nh my tuyn st Khe Lchdo nhm k thut Cng ty m tuyn ng Sin Quyn lp v c Cng

ty khong sn Lo Cai chp thun;- Cn c vo kt qu cn chnh thit b v chnh nh cng

ngh, nhm k thut lp bo co nh sau:

1. Dy chuyn thit b* Khu p sng:- My p PE 400x600, PEX 150x750, sng rung, bng ti cao su,

cp liu tm H thng thit b trong dy chuyn hot ng nnh.

- Cc chi tit nh: Trc lch tm, bnh , ru l con ln hot ngn nh khng c hin tng kt cng.

* Khu nghin tuyn:- H thng my nghin, h thng phn cp rut xon, h thng

bng ti cp liu, h thng my tuyn t hot ng n nh.- Cc chi tit nh: trc quay, gi , hp gim tc, bnh rng ,trc

vt bnh vt nng h hot ng m khng c hin tng kt cng.- Bm nc trong hot ng nc cung cp cho sn xut.

2. Chnh nh cng ngh* Khu p-sng:- iu chnh khe h ca my p PE, PEX m bo cp ht


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20/7 9,5 10-12


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STT

Ngy/thng

Tn SPTrng l-ng (T)

Chi tiu Cngngh Manhetit

GhichThu

hoch

(%)

Thc

thu(%)

Hm

lng(%)

1 18/7

Tinh qung 10,27 13.42

93.13

93.13

ui thi 24,73 86.56

6.87 0.3

Nguyn khai 35 100 100 12,76

2 19/7

Tinh qung 12,61 13.98

96.32

93.52

ui thi 58,09 86.2 3.68 0.58Nguyn khai 70,7 100 100 13.5

8

3 20/7

Tinh qung 16,89 14.1 97.09

93.78

ui thi 50,31 85.9 2.91 0.43Nguyn khai 67,2 100 100 14,3

1

4 21/7

Tinh qung 17,60 19.23

98.34

94.6

ui thi 42,5 80.77

1.66 0.38

Nguyn khai 60,1 100 100 18.5

5 26/7

Tinh qung 36,19 16,15

95,86

92,77

ui thi 117,81 83,85

4,14 0.77

Nguyn khai 154 100 100 15,63

6 27/7

Tinh qung 35,37 16,76

95,88

92,41

ui thi 114,63 83,24

4,12 0,80

Nguyn khai 150 100 100 16,15


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Tngcng

Tinh qung 128,93 15,12

96,28

93,15

ui thi 408,07 84,88

3.72

0,64

Nguyn khai 537 100 100 14,

63

* Sau thi gian chnh nh cng ngh la chn cthng s cng ngh hp l cho khu nghin phn cp,tuyn nh sau:

Nghin phn cpTuyn t

chnhMy tuyn

tinhGhi

ch

C.Liu

(t/h)

R/L

(%)

-

0,074mm(%)

Gc

t( )

Khe

thoSP(cm)

Gc

t( )

Khe

thoSP(cm)

11-12 42-45

53-58 12-15

1.5-2.5

12-15

1,5-2

3. Nhn lc* Cng nhn vn hnh

- C bn lm ch c dy chuyn thit b v cng ngh, as cng nhn trong nh my c th ng vn hnh c lp tng

khu trong dy chuyn m bo phc v sn xut lu di.- Nm bt c cc yu t nh hng n nng sut cht lng snphm v cch thc iu chnh.

- sp xp tng i hp l v nhn lc trn c s da vonng lc ca tng cng nhn vn hnh sao cho pht huy ti a hiuqu lao ng.

- Tuy nhin do s lng cng nhn phn ln l lc lng lao ng tdo nn kin thc c bn cn hn ch, thi gian tip xc dy chuyncng ngh ngn, cc thng s iu chnh cng ngh u bng th

cng v khng c thit b o kim ( nc u vo, u ra nghinphn cp, mc bn) nn vic tip thu kin thc, rn luyn k nngcha tht nhanh, nn t c cc k nng trong cng vic cn t rnluyn mt thi gian tip theo.

* Cng nhn KCS:- o to c bn v vic ly mu gia cng mu, ly mu v

tnh ton c ch tiu cng ngh nh: Nng R/L, cp ht -0,074mm,tnh tan nng sut cp liu..


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- Vic o to cng nhn ho phn tch i hi thi gian di, chnh xc cao mt phn do thit b, dng c phn tch XN cha cnn t cng tc kin ngh Cng ty s c nhn lc ln phng KCS Cngty M tuyn ng Sin Quyn hc qui trnh v thc hnh phn tch.

4. nh gi v xut:* nh gi

- i vi khu p sng:+Nng sut p cha n nh khi tri ma qung ln nhiu t,

st dn n b tc sng, tc v tr nhng im rt qung. Chonn cn tn dng trit khi tri nng ro tng cng p qungm bo lng qung d tr cung cp n nh cho khu nghintuyn.

- Khu nghin phn cp, tuyn t:+ Thit b hot ng n nh, nng sut cp liu, thng s

cng ngh nh nng R/L, cp ht -0,074m khu nghin phn cpm bo.

+ Hm lng tinh qung st tng v t l thu hi lng Manhetit t-ng i tt thc thu TQ TQ = 93-98%.

+ Tuy nhin do hm lng st khng t (Hematit ) trong nguynkhai cao =30-35% so vi phng n a ra 10 % nn thc thu tngst cha cao TQ = 40-46%.

* xut:- Khu p sng:

+ Nn di mt lp , hoc qung c hm lng thp trn nnsn ga trnh tnh trng ly li, ln t khi tri ma.

+ Gia cng ch to sng chn ng c kch thc l li 25cm ( thayv sng c kch thc 22cm ) gim bt hin tng tc sng khi qungln nhiu t, st.

+ Rt cn thit phi ci to im rt qung vo 02 bun ke cha

liu cp vo nghin phn cp sao cho din tch s dng d trqung mc cao nht m bo gi my hot ng khu nghinphn cp khi khu p sng dng bt xit, hay s c hng hc thitb.

+ Cn thit phi lm mi tre m bo cho ngi v thit b.+ Hon thin k taluy, lan can bo him m bo ATL.

- Khu nghin phn cp, tuyn t .+ Sau thi gian chy t 02-03 thng tin hnh tho kim tra mc

mi mn ca tm tp, tm lt bn trong nghin.


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+ Vi nng lc ca thit b hin ti c th nng nng sut cpliu ln 120-140 % so vi nng sut thit k ( iu chnh cp ht saukhu p sng


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+ Cn thit phi tnh ton xy thm b cha nc sn xut m

bo gi my hot ng ca xng tuyn khi bm b s c, hng hc

sa cha.

+ Cho tin hnh lm li chn rc m bo rc khng chui volm kt bung bm.

5. Kt lun

- Cn thit tin hnh phi trn trung ho qung nguyn khai

m bo hm lng Manhetit c nh vy gim thiu lng tht thot ti

nguyn.

- Sau mt thi gian cn chnh thit b, chnh nh dy chuyn

cng ngh, o to b tc tay ngh cho i ng vn hnh. c s to

iu kin ca BQLDA, lnh o XN Khai thc v tuyn st Khe Lch

vi kt qu c sau qu trnh chnh nh cng ngh, n nay c

th khng nh a Nh my tuyn Manhetit vo hot ng sn xut

./.

T/M nhm k thut

L Xun Tuyn

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