General steps Flashcards by Shreeya Gupta

Q

levigation

A

Wilfley table

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Q

difference in weight

A

gravity separation

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Q

difference in magnetic properties

A

magnetic seperation

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Q

froth floatation

A

mainly for sulphide ores (S2-)

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Q

frothers

A

pine oil, eucalyptus oil

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Q

froth stabilizers

A

cresol and aniline

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Q

water wet

A

gangue

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Q

froth wet

A

ore

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Q

collectors

A

sodium xanthates

helps in attachment of ore to air bubbles

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Q

activators

A

enhance floating properties

CuSO4

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Q

depressant

A

PbS and ZnS : CN-

PbS is separated and then oxidising agents are used and ZnS is removed.

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Q

finest ore of iron

A

magnetite

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Q

leaching is used for

A

Al, Ag, Au

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Q

leaching for Al2O3

A

NaOH > Na[Al(OH)2] or NaAlO2.2H2O > Al(OH)3 > dried(Al2O3)

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Q

oxidation process

A

calcination

2. reduction

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Q

calcination is used for

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A

hydrated ores

2. carbonated ores

Q

exothermic oxidation

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A

roasting

Q

endothermic oxidation

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A

calcination

Q

hydraulic washing

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A

gravity separation

levigation

Q

excess of air

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A

ROASTING

Q

roasting is used for

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A

sulphide ores

Q

philosopher wool

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A

ZnO

Q

heating in limited or no air (oxidation)

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A

calcination

Q

oxidation is done on which temp

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A

below MP

S + O2

SO2

P +O2

P4O10

As + O2

As2O3

calcination is for _ impurities

volatile

roasting is for _ impurities

combustible

concentration of ore is also known as

dressing of ore