General steps

Question 1

levigation

Answer 1

Wilfley table

Question 2

difference in weight

Answer 2

gravity separation

Question 3

difference in magnetic properties

Answer 3

magnetic seperation

Question 4

froth floatation

Answer 4

mainly for sulphide ores (S2-)

Question 5

frothers

Answer 5

pine oil, eucalyptus oil

Question 6

froth stabilizers

Answer 6

cresol and aniline

Question 7

water wet

Answer 7

gangue

Question 8

froth wet

Answer 8

ore

Question 9

collectors

Answer 9

sodium xanthates

helps in attachment of ore to air bubbles

Question 10

activators

Answer 10

enhance floating properties

CuSO4

Question 11

depressant

Answer 11

PbS and ZnS : CN-

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

Question 12

finest ore of iron

Answer 12

magnetite

Question 13

leaching is used for

Answer 13

Al, Ag, Au

Question 14

leaching for Al2O3

Answer 14

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

Question 15

oxidation process

Answer 15

1. calcination

2. reduction

Question 16

calcination is used for

Answer 16

1. hydrated ores

2. carbonated ores

Question 17

exothermic oxidation

Answer 17

roasting

Question 18

endothermic oxidation

Answer 18

calcination

Question 19

hydraulic washing

Answer 19

gravity separation

levigation

Question 20

excess of air

Answer 20

ROASTING

Question 21

roasting is used for

Answer 21

sulphide ores

Question 22

philosopher wool

Answer 22

ZnO

Question 23

heating in limited or no air (oxidation)

Answer 23

calcination

Question 24

oxidation is done on which temp

Answer 24

below MP

Question 25

S + O2

Answer 25

SO2

Question 26

P +O2

Answer 26

P4O10

Question 27

As + O2

Answer 27

As2O3

Question 28

calcination is for _ impurities

Answer 28

volatile

Question 29

roasting is for _ impurities

Answer 29

combustible

Question 30

concentration of ore is also known as

Answer 30

dressing of ore