Metallurgy

Question 1

Electromagnetic Separation

Answer 1

Powder-Roller-Sepration

Question 2

Gravity Separation

Answer 2

Hydrolic Washing

Difference in densities

Question 3

Froth Flotation

Answer 3

For Sulphide Ores

Washer women

Question 4

Froth Stabilizers

Answer 4

Cresol, Aniline

Question 5

Depressants

Answer 5

NaCN+Na2CO3
ZnS ->water
PbS -> Froth
Else Adjust water:oil Ratio

Question 6

Leaching

Answer 6

Alumina from Bauxite

Au/Ag

Question 7

Alumina Leaching

Answer 7

Bayer’s Method
Impurities: SiO2, FeO, TiO2

Ore+NaOH->X
X+CO2->Al2O3

Al2O3 + NaOH +3H2O
–>2Na[Al(OH)4]

+CO2–>Al2O3.xH2O

1470K–>Al2O3

Question 8

Leaching Ag/Au

Answer 8

Ore+CN+O2 =>X
X+Zn=>M

4Au +8CN- +2H2O + O2
=>4[M(CN)2]- +4OH-

+Zn=>[Zn(CN)4]²- +2Au

Question 9

Calcination

Answer 9

Heating

Carbonate=>Oxide+CO2
Hydroxide=>Oxide+H2O

Fe2Co3.xH2O
ZnCO3
CaCO3.MgCO3

Question 10

Roasting

Answer 10

Heating to MP in Reverbaratory Furnace

Sulphide+O2=>Oxid+SO2

ZnS,PbS,Cu2S

Question 11

Slag

Answer 11

FeO+SiO2=>FeSiO3

Question 12

Copper Matte

Answer 12

Cu2S+FeS

Before Roasting Slag is produced

Question 13

Froth Collectors

Answer 13

Na/K ethyl Xanthate

Question 14

Red. of Iron Oxide

Answer 14

Blast Furnace

Limestone+Coke

Question 15

Cu2O=>Cu

Answer 15

Reverbaratory Furnace

Coke+Silica

Question 16

ZnO=>Zn

Answer 16

ZnO+ ∆ => Zn+CO

Question 17

Hall Heroult’s Process

Answer 17

Steel Cathode => Al

Graphite Anode=>CO2

Question 18

Blast Furnace
Lower Temp(500-800K)

Answer 18

Fe2O3+CO=>Fe/Fe3O4+CO2

Fe2O3+CO=>2FeO+CO2

CaO + SiO2 => CaSiO3

Question 19

Blast Furnace

Higher Temp.(900-1500K)

Answer 19

C+CO2=>2CO

FeO+CO=>Fe+CO2

Question 20

Types of Iron

Answer 20

Pig=>4%C and S, P, Si, Mn

Cast=>3%C Extremely Hard and Brittle

Wrought=>Malleable and Purest

Question 21

Pig=>Cast Iron

Answer 21

Pig Iron +Scrap Iron +Coke

Melted

Question 22

Cast=>Wrought Iron

Answer 22

Reverbaratory Furnace
Hamatite used to oxidize Carbon

CaO is added to make slag of S, Si, P

Question 23

Ellhingum Diagram

Answer 23

T vs. ∆G°

Question 24

Mond’s Process

Answer 24

Purification of Ni

Question 25

Liquification used for

Answer 25

Pb, Sn, Sb, Bi and Hg

Question 26

Nature of Oxides

Answer 26

Non metal Oxides are Acidic Alkali metal Oxides are Basic Al2O3 is amphoteric

Question 27

Van Arkel Method

Answer 27

Purification of Zr & Ti

Question 28

Zone Refining

Answer 28

B, Si, Ge

Question 29

Distillation for

Answer 29

Zn

Question 30

Bronze

Answer 30

Cu+Sn

Question 31

German Silver

Answer 31

Cu(50%)+Zn(30%)+Ni(20%)

Question 32

Anode Mud

Answer 32

Sb, Se, Te, Ag, Au, Pt