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MET126 > Magnetic & Electrostatic Separation > Flashcards

Magnetic & Electrostatic Separation Flashcards

1
Q

utilizes the force of magnetic field to produce different movement of
mineral particles through a magnetic field

A

Magnetic Separation

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2
Q

Purposes:
• Separation of magnetic valuable minerals from gangue
• Removal of tramp metals

A

Magnetic Separation

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3
Q

What are the 3 classifications of magnetic attraction?

A

Diamagnetics, Paramagnetics, Ferromagnetics,

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4
Q 
nonmagnetic materials,
which are repelled along the lines of
magnetic force to a point where the field
intensity is small. The forces involved
here are very small and they cannot be
concentrated magnetically.
A

Diamagentics

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5
Q

copper, mercury, gold, bismuth

A

Diamagnetics

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6
Q 
weakly magnetic
materials, which are attracted along the
lines of magnetic force to points of
greater field intensity. They can be
concentrated in high-intensity magnetic
separators
A

Paramagnetics

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7
Q

ilmenite (FeTiO3), rutile (TiO2),
siderite (FeCO3), pyrrhotite (FeS), and
hematite (Fe2O3)

A

Paramagnetics

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8
Q 
strongly magnetic
minerals, which have very high
susceptibility to magnetic forces and
retain some magnetism when removed
from the field (remanence). They can be
concentrated in low-intensity magnetic
separators.
A

Ferromagnetics

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9
Q

magnetite (Fe3O4), cobalt, nickel

A

Ferromagnetics

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10
Q

– the prime requirement is the provision of a

high-intensity field in which there is a steep field strength gradient

A

Magnetic Field Gradient

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11
Q

– the intensity must be regulated in order to deal with various types of material

A

Magnetic Field Intensity

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12
Q

What are the two types of magnetic separators?

A

Low- intensity & High- intensity

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13
Q

– for ferromagnetic and highly paramagnetic minerals

A

Low- Intensity

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14
Q

– for very weakly paramagnetic minerals

A

High- Intensity

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15
Q

What are the 3 methods under low-intensity magnetic separators?

A

magnetic pulley, drum separator, cross- belt separator

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16
Q

a LIMS that were used for tramp iron removal

A

Magnetic Pulley

17
Q
  • separation occurs by the “pick-up”

principle

A

Drum Separator

18
Q

Drum separator:

used for concentrating coarse sands which are strongly magnetic (cobbing)

A

Dry LIMS

19
Q

Drum separator:

used for recycling and
cleaning magnetic media in DMS and
processing of ferromagnetic sands

A

Wet LIMS

20
Q

What are the three types of Drum Separators?

A

concurrent, counter- current, counter- rotation

21
Q

What are the 2 methods for High- Intensity Magnetic Separators?

A

induced roll magnetic separator & wet high- intensity magnetic separator (WHIMS)

22
Q
  • widely used to treat beach sands,
    wolframite and tin ores, glass sands,
    phosphate rock and weakly magnetic
    iron ores
A

Induced Roll Magnetic Separator

23
Q
  • widely used to concentrate low-grade iron ores containing hematite
A

Wet High-Intensity Magnetic Separator (WHIMS)

24
Q
  • uses difference in electrical conductivities of ore feed for separation
  • limited to dry, fine particle size, small capacity operation
A

Electrostatic Separation

25
Q

high surface charge

A

Insulators

26
Q

no charging effect

A

Conductors

27
Q

What are the different charging mechanisms of electrostatic separation?

A

Ion Bombardment, Conductive Induction, Triboelectric Charging

28
Q

– a high voltage is applied between 2 electrodes so that
the gas near the electrodes ionizes and forms a corona discharge, a continuous
flow of gaseous ions

A

Ion Bombardment

29
Q

– polarization of a mineral particle occurs

upon exposure to an electric field

A

Conductive Induction

30
Q

– an uncharged particle develops
an opposite charge relative to the electrode at its surface closest to the electrode, and a
corresponding like charge to the electrode on
the particle surface furthest from the electrode

A

Polarization

31
Q 
– contact electrification
– two materials of dissimilar
electrical properties exchange
electrons upon coming into contact
with one another
A

Triboelectric Charging

32
Q

What are the two mechanisms of separation?

A

lifting effect & pinning effect

33
Q

the attraction of particles carrying one kind of charge toward an electrode of the opposite charge. Particles are lifted from the separating surface toward the electrode.

A

Lifting Effect

34
Q

non-conducting mineral particles, having received a surface charge from the electrode, retain this charge and are pinned to the oppositely charged separator surface by positive-negative attraction.

A

Pinning Effect

MET126 (5 decks)

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