magnetic separation

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MAGNETICSEPARATION

Lecture # 9

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MAGNETIC SEPARATION

Magnetic separationis a process inwhich magnetically susceptible material is

extracted from a mixture using a magnetic

force. This separation technique can be useful

in mining iron as it is attracted to a magnet.

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MAGNETIC SEPARATION

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MAGNETIC SEPARATION

Principle:

Magnetic separation is technique used in

metallurgy for the concentration of ore

particles. The principle of this method is that

the magnetic ore particles can be separated

from non magnetic impurities (gangue) or vice

versa.

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Principle

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MAGNETIC SEPARATION

APPLICATIONS:

Magnetic separation is used in a wide spectrum of areas

of material handling whose requirements differ

considerably. In general terms, magnetic separationmethods are used in several distinct processes

Magnetic filtration

! recovery of liquid ( the magneti"able solids are

discarded)

! recovery of magneti"able solids (liquid is discarded)

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APPLICATIONS

#oncentration of magneti"able component into

the magnetic fraction and re$ection of the

%non!magnetic& waste.

#oncentration of non!ferrous metals by

discarding the non!metallic components of a

mixture, and separation of individual non!

ferrous metals into individual fractions.

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APPLICATIONS

'eparation of materials into individual density

fractions.

for large volume separation in the mining,

aggregate, and other industries.

It is also widely used to remove metalcontaminants from plastics but not to separate

plastics from each other.

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ADVANTAGES

Magnetic separation provides hands!off

automation and high reliability in contrast to

ha"ardous, laborious, and inefficient manual

methods of cutting apart material components

with a nife or band saw. 'uch methods often

result in incomplete separation, so recovered

material is usable mainly in lower!valueapplications.

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TPES O! MAGNETICSEPARATION PROCESSES

ry magnetic separation process.

*et magnetic separation process.

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DR MAGNETIC SEPARATION

In a dry mode, coarse magnetic particles can

be recovered by a variety of high!intensity

magnetic separators

Including induced magnetic roll , cross belt

separator , permanent magnet roll separator,

rare!earth drum separator and open!gradient

separator.

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T"e MagMi $ %or &r' coaceaning

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Pu(eri)er


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*or+ing

The MagMill is a selective dry screening and magnetic separationprocess that is integrated into the existing coal pulverizers to removeunwanted coal constituents prior to combustion. The MagMill canreduce emissions of mercury and/or sulfur, improve boiler performanceby reducing ash components that contribute to slagging and/or erosion,and reduce coal costs by upgrading poor quality coals.

ithin a pulverizer, coal falls down a central feed pipe onto a rotatingtable in the bottom portion of the pulverizer. !s the table rotates, thecoal is slung radially outward and crushed as it passes underneathgigantic steel tires which roll in grooves on the table. "ot air blown fromunderneath the rotating table enters the grinding chamber through agap at the outer circumference of the rotating table. This hot air bothdries the coal and sweeps the #ne particles released in the crushingupward to the classi#er at the top of the mill. $versize particles arereturned for additional grinding and the #ne particles are blown directlyto the burners.

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%ont&

'ecause of their weight and hardness, the minerals inthe feed coal require more passes underneath therollers than does the relatively soft hydrocarboncomponent of the coal. The minerals, therefore,

become concentrated on the grinding table. (n the MagMill con#guration a stream rich in these

hard)to)grind minerals such as iron pyrite iswithdrawn through the wall of the pulverizer to themagnetic separator. $utside the pulverizer the

material is processed through mechanical andmagnetic separators to re*ect the minerals and torecover the carbon which is returned to the mill forgrinding to speci#cation.

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APPLICATIONS

In the removal of tramp iron from process

streams.

In beneficiations of strong magnetic minerals,

as well as feebly magnetic minerals such as

wolframite, cassitreite or limenite.

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APPLICATIONS

+urification of numerous industrial minerals

such as andalusite, glass sand, fluorspar,

feldspar, diamond and others, by removing

fine strongly magnetic impurities.

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DR MAGNETICSEPARATOR

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or magnetic separator to be successful, the

material should be pletely dry, which sometimes

involves an expansive heating stage.

or particles smaller than a certain threshold si"e

(for instance -m), the attractive electrostatic

and van der *aals forces will cause sticing andthe formation of aggregates. 'electivity of

separation can thus be severely affected.

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*ET MAGNETIC SEPARATION

*et low intensity drum magnetic separation

(/IM') are used to recover strongly magnetic

solids from a slurry feed.

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*ET MAGNETICSEPARATOR

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,SES:

0s a magnetic filter to remove a single solid

component from a suspension.

0s a magnetic separator to remove unwanted

magnetic component from a mixture of

materials

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,SES:-.

or a concentration of valuable wealy

magnetic materials from a mixture.

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MAGNETIC !ILTRATION

Magnetic filtration is used primarily for the

removal of fine particulates from dilute fluid

suspensions.

1emoval is carried out by passing suspensions

through a magneti"ed matrix, which leads to

the retention of particles throughout the matrix.The fluid stream may be either liquid or gas.

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MAGNETIC !ILTERATIONPROCESS

The process of magnetic filtration is analogous

to that of deep be filtration, the difference being

that an additional external force, namely the

magnetic force, contributes to the filtrationefficiency in magnetic filtration.

The magnitude of the applied magnetic field isdictated by the magnetic susceptibility of the

suspended solids.

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REFERENCES:

http22www.bit.or.at2irca2bbsshow3.php4ref56789:7I

/9:737;+9:7:'uelle6=cc6

http22boos.google.com.p2boos4

id6*?p@A'e3>#=pg6+0

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