Catalogo Micronizzazione Eng

8/10/2019 Catalogo Micronizzazione Eng

1/12

Micronization & fine selection of the mineralsInnovatory and high-performance solutions aiming to solve issues relatedto the micronization and the fine selection of the minerals, at the top

of the range for reliability, easiness of assembling and maintenance.


2/12


3/123

AIR SEPARATORS TYPE HPS

Utilization benefits

Stability of the granulometric quality of the finished product even in

presence of irregular feeding product both granulometry- and quan-

tity-wise.

Deflocculating effect of the feeding product which allows to reduce

to the smallest the content of fines inside the rejected material even

if agglomerated.

Capability to select products with a top cut (d97) < 10 micron.

Possibility to alter continually the quality of the finished product

without mechanical operation and/or subdue to chromatic sensors

the top cut set value.

Simplicity of installation even in existent plants.

Self-feeding option - drawing the selection material within a distan-ce of 25 m away from the selection unit and/or restore the fine

selected product to a distance exceeding 20 m.

Lack of dust.

High energy efficiency.

Principle of operation

The air separators HPS, in their basic configuration, consist of aselection unit, a bag filter for the collection of the selected material

and a high efficiency centrifugal fan which generates a current of air

which is necessary for the system functioning.

RAW MATERIALIN LET

UNIT

SELECTION

BAG FILTER

VENT

FINE PRODUCTOUT LET

HIGH EFFICIENCYFANS

REJECT

AIR

AIR


4/12

AIR SEPARATORS TYPE HPSThe product which must undergo a selection is introduced into the separa-

tion unit either by means of mechanical transportation (bucket elevator,

screw, vibrating batcher) or, in the FLUX version of the separator, the mate-

rial is sucked directly through the bottom of the separator.

The current of air which crosses the air separator from the bottom to the

top meets the material and drags its finest particles towards the exit mouth

of the air separator.

Along its way towards the machine outlet the material encounters the mere

selecting unit which consists of a squirrel cage frame which speed of rota-

tion can be regulated by a frequency converter.

The particle of the material for selection is subdued to two types of force so

that it can cross the selection frame: the centripetal force generated by the

air current which crosses the selection frame and the centrifugal force

generated by the rotation of the frame.

TECHNICAL DATA

Type Raw material 97 = m Installedin let power

HPS05 0.5:5 t/h 10:150 m 17 kW

HPS10 1:10 t/h 10:150 m 32 kW

HPS11 5:15 t/h 10:150 m 47 kW

RAW MATERIALIN LET

FINEOUT LET

SECONDARY AIR

FLUIDIFICATIONAIR

COARSE PRODUCTOUTLET

AIR

AIR

AIR

REJECT

FINEOUTLET

FINEOUTLET

REJECT

RAWMATERIAL

IN LET

RAW MATERIALIN LET


5/125

In a simplifying way we could assume that the force acting on a spherical

particle dragged by the air current is of the following type:

Fk = 0,4 x d2xg x v

2

Fk = force of entrainment

d = particle diameter

g = air density

v = air current speed

while the centrifugal force exerted by the rotation speed of the selection

frame could be summarized by a formula of the following type:

Fc = 4.2 x d3xs x vp

2

Fc = centrifugal force

d = particle diameter

s = density of the material for selection

vp

= centrifugal speed

The particle of bigger dimensions (


6/12

in other words we can equalize and simplify the two equations:

dmax = 0.095 xg/ s x v2/ vp

2

if we convert the formula here above into engineering values which can be

detected easily in an industrial process and assemble all the values which

appear constant, we will be able express in a simplified way the formula

which regulates the operating of the selection system HPS as follows:

dmax = K x Q2/ RPM2

dmax = size of the biggest particlewhich crosses the selector

K = cumulative constant

Q = range of air crossingthe selector expressed in m3/h

RPM = rotation speed of the selectorexpressed in turns/minute

Hence, it is clearly deducible that the augmentation of the air rangewhich crosses the selection frame increases the top cut diameter

while augmentations of the selecting frame rotation speed decrease

the top cut values.

AIR SEPARATORS TYPE HPS

TECHNICAL DATA

HPS Rotors n Power kW A B C D E

5 1 15 1540 980 2920 720 144

10 2 30 1635 1700 3415 1020 244

15 3 45 2130 2130 3550 1250 273

20 4 60 1935 1935 3675 1430 324


7/127

HPS DIFFERENT TYPES OF INSTALLATION

ConventionalThe selection unit is assembled on the

top of the silo for rough material and is

fed in by a bucket elevator or a screw.

The bag filter which discharges the

selected product is assembled on thetop of finished product silo.

Pre-cycloneThe selection unit is assembled onthe top of the silo for rough material

and is fed in by a bucket elevator or a

screw. A cyclone is put before the

bag filter, both are assembled on the

top of the finished product silo.

This type of installation allows the

selection of three different sizes of

the product.

FluxedThe selection unit is assembled on the top of the silo for rough material and intakes the product for selection

directly from the production machine. The bag filter from which the selected product is discharged is assem-

bled on the top of the silos of the finished product. Thanks to this solution the selection system serves also as

a conveyance equipment for the feeding product, furthermore, during the conveyance phase the material for

selection fluidifies and improves the efficiency of the selection unit.

IN

OUT

OUTOUT

OUT

OUT

OUT OUT

IN


8/12

The logical evolution of the HPS air separa-

tors was to install the selection head of a HPS

air separator on the top of the grinding unit

and achieve in that way not only a mill or a air

separator but a complete and self-sufficient

micronization and selection plant.

One machine which alone consents to micro-

nize, to select and to transport the micronized

material.

Utilization benefits

Stability of the granulometric quality of the finished product even inpresence of irregular feeding product, both in size and quantity.

Capability to select products with a top cut (d97) < 10 micron.

Possibility to alter continually the quality of the finished product

without mechanical operation and/or to subdue the top cut set value

to chromatic sensors.

Simplicity of installation even in existent plants.

Possibility to restore the grinded and selected material to a distan-

ce of 35 m from the selecting and grinding unit.

Lack of vibration and external parts in motion.

Lack of dust.

High energy efficiency due to the lack of overgrinding effect and to

the self-regulating system for the working load.

Low noisiness and vibration.

MICRONIZATION AND SELFSELECTION MILLS - S TYPE

MILLING & SELECTIONUNIT

BAG FILTER

FINALPRODUCT

SCREW

DOSING

HIGHEFFICIENCY

FANS


9/129

DESCRIPTION OF THE GRINDINGAND SELECTING UNIT FUNCTIONING

Principle of operation

The installation of a grinding system with our TYPE S mill is very simi-

lar to the one described above in the section of our selection units

TYPE HPS.

Our grinding and selecting system consists of a screw measuring device

for the material for grinding, assembled integrally with the mill body; the

mill & selection body; a bag filter for the collection of the grinded and

selected material placed on the top of the collecting silo and a high effi-

ciency centrifugal fan which sets the system in depression and carries

out the transport of the grinded and selected material.

The air intaken by the fan enters into the grinding chambers throughouttwo silenced ducts placed frontally to the two disk wheels, then crosses

the grinding area of the mill and rises towards the selection unit.

Once crossed the selector, the air exits the selection mill group and rea-

ches the bag filter inside of which the finished product sets down.

The material for grinding is introduced into the grinding chamber by a

dosing screw at a variable speed and is discharged among the two

wheels.

The screw speed is set subject to the intensity of the current absorbed

by the motors of the two grindstones in order to maintain a constant and

optimal working load of the mill even if the granulometry curve of the pro-cessed material changes.

RAW MATERIALIN LET

AIR INLET

FINE PRODUCTOUT LET


10/12

The material for grinding is launched

by the centrifugal force of the ham-

mers placed on the periphery of the

wheels, in a way to take up the energyrequired for a grinding which occurs

through collision.

The grinding of the product occurs

through collision against the hammers,

through collision with the wearproof pla-

tes which are meant for the protection of

the mill casing, but mostly through colli-

sion between the very particles of the

material for grinding.

The material introduced into the grindingchamber being of a sufficiently small size

or being submitted to reduction by the

grinding action of the mill, is entrained

towards the selection frame by the air

current which crosses the mill.

The versatility of the TYPE S mills gives the possibility to easily adaptthem also for some very special applications such as:

exsiccation of materials during the grinding and selection phase,

through hot air brought in from external sources; a typical case for

this use is in the pet-coke micronization for combustible.

Grinding in a nebulized atmosphere with anticaking additives used

during grinding of those products which have the tendency to adhe-

re to the surfaces and create sculls, such as the sodium bicarbona-

te used for the coating of exhausted gas neutralization plants.

DESCRIPTION OF THE GRINDINGAND SELECTING UNIT FUNCTIONING

SPECIAL APPLICATIONS

The material, which has already reached the dimensions to which the

machine has been set up to, will manage to pass through the selection

frame upon reaching it, whereas the coarse material will be sent back insi-

de the grinding chamber by the force of gravity.

The particular lay-out structure of our TYPE S mill allows to minimize theeffect of overgrinding of the product, typical for the installations consistingof mills combined with air separator, which brings to pointless energetic

expenses due to the overgrinding.

We contrive our machine selecting different materials for the hammers and

the shells, according to the characteristics of the material for grinding.

Furthermore, the wide nose doors allow a fast access to all the expendable

organs of the machine without the need of auxiliary instruments for an easy

cleaning or maintenance.


11/1211

TECHNICAL DATA

Type S40 S60 S80 S100

d97=m 8100 8100 8100 8100

Installed power (kW)

Mill 2x15 2x30 2x55 2x75

Selector 7.5 11 15 22

Fan 15 22 30 45

Dimension

A 1900 2750 3200 3450

B 1250 1330 1830 1950C 2300 2500 2700 3020

D 900 1000 1100 1150

Weight (kg) 1800 3100 4300 5250

SPECIALAPPLICATIONS the compact configuration of this type

of plant makes it suitable for the con-

struction of grinding, selecting and

transporting plants built in advance ina workshop, in order to reduce to the

minimum the constructing time on the

erecting yard for their positioning and

enabling.

Top-cut


12/12

Administration, Financial & [email protected]

Engineering, Technology & [email protected]

Marketing & [email protected]

SOCIET IMPIANTI CALCE srlVia San Francesco, 49/51 - 20090 Opera (Milano) ItalyPhone: +39.0257604767 - Fax: +39.0257601749http://www.sic-lime.it - E-mail: [email protected]

Documents

Catalogo Micronizzazione Eng