CAPITULO 7 ------LIXIVIACIONSULFUROS1

8/18/2019 CAPITULO 7 ------LIXIVIACIONSULFUROS1

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Sulfuro 25°C 100°C 200°C 300°C 400°C

Ag2S 1*10-12 5*10-12 2*10-11 3*10-11 5*10-11

CoS 2*10-6 1*10-5 5*10-5 1*10-4 4*10-4

CuS 2*10-13

7*10-13

3*10-12

8*10-12

1*10-11

Cu2S 1*10-12 5*10-11 --- --- ---

FeS2 2*10-8 2*10-7 2*10-6 8*10-6 2*10-5

HgS 1*10-17 7*10-17 4*10-16 1*10-15 3*10-15

PbS 3*10-9 5*10-8 6*10-7 3*10-6 8*10-6

ZnS 3*10-5 2*10-3 0.1 1.2 7.0

Solubilidad de sulfuros en H2O en g/l (Verhoogen, 1938)


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Hp

hp

Np

di, p

dt, p

Hm

hm

Nm

di, m

dt, m


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Pressure Leach Approach Roast – Leach Approach

Concentrate

Pressure Leach

Iron

Concentrate

Roast

Leach

Acid Plant

Sulphuric Acid

SO2Dross

Dross

Return

electrolyte

Leach residue

Sulphur

Puri!y

"lectro#in

Castin$

%inc dust

Sla& 'inc

Limestone(arosite residue

Dross to roastin$

or leachin$

Return electrolyte

to leachin$

"lectrolyte

Iron

Remo)al residue


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* Concentrate !eed Pressure leach Roast leach

Chemical analysis + &y #ei$ht, dry &asis-

%n ./01 ./01

e *304 *304

S 4.0/ 4.0/Cu *0/ *0/

H$ 101*. 101*.

Cl 10115 10115

Cd 10*/ 10*/

6oisture + &y #ei$ht, dry &asis- 301 301

Particle si'e 7.. 8 3401 3401

2 O)erall reco)eries +-%n 9/01 9/01

Cu 3101 5/01

Cd 9101 9101

4 Operatin$ time +days:year-

. Leachin$

Operatin$ pressure +;pa- emperature +?C- */1 91

O@y$en utili'ation +- 91

H2SO.:%n molar ratio *0*

/ "lectro#innin$

Current density +A:m2- 3/1 3/1


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irst sta$e or

neutral leach

Liuid7solid

separation

Liuid7solid

separation

Second sta$e

or acid leach

inal residue

+9< – 99 %n e@traction-

Return electrolyte

+/1 $:l %n, */1 $:l H2SO.-

Partly reacted

solutionPartly reacted

solids

+*/ $:l %n, *01 $:l H2SO., 10/ $:l e-

inal solutionConcentrate


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In this *90.117$al autocla)e, sulphuric acid at 2/1BC and 311 psi leaches latente


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>his .31 $al autocla)e operates at 221BC and ./1 psi


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A *30311 $al autocla)e !or precipitation o! sulphides #hith hydro$en

sulphide


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>his .0111 $al autocla)e operates at 22/ psi !or o@idation leachin$ o! Ni7Co

mattes


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Rotary autocla)e !or leachin$ tun$sten and moly&denum concentrates


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>u&e autocla)e assem&ly +el!eldt *935-


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CAPITULO 7 ------LIXIVIACIONSULFUROS1