Metallurgy

Question 1

Kaolinite formula

Answer 1

Al2( OH)4 Si2O5

Question 2

Cuprite formula

Answer 2

Cu2O

rite means no1, thus Cu is in +1 state

Question 3

Copper glance formula

Answer 3

Cu2S

Question 4

role of collectors in froth floatation

Answer 4

Enhance non-wetabillity of mineral particles

Question 5

Leaching eq

Answer 5

M + CN- + O2 + H2O —–> [M(CN)2]- + OH-

[M(CN)2]- + Zn —–> [Zn(CN)4]2- + M

Question 6

Al2O3 leaching

Answer 6

Al2O3 + NaOH + H2O ——–> Na[Al(OH)4]

Na[Al(OH)4] + CO2 ———–> Al2O3.xH2O + NaHCO3

Question 7

copper matte composition

Answer 7

Cu2S + FeS

Question 8

Distillation principle

Answer 8

Impure metal is evaporated to obtain pure metal as distillate
(Used for low BP metals)

Question 9

Liquation used for what type of metals

Answer 9

Low MP metals

Question 10

Electrolytic refining principle

Answer 10

Less basic goes to anode mud

More basic stays in soln

Question 11

Metals in anode mud are

Answer 11

Au,Pt,Ag,Se,Sb

Question 12

Zone refining principle

Answer 12

impurities are more soluble in melt than in the solid state of metal

Question 13

Vapour phase refining requirements

Answer 13

Metal should convert to its volatile form easily

Volatile compound should be easily decomposable

Question 14

Van arkel is used to remove which impurities

Answer 14

O and N impurities

from Zr, Ti

Question 15

Metal used in extraction of Cr and Mn from their oxides

Answer 15

Al

Question 16

Coinage alloy

Answer 16

Cu and Ni

Question 17

German silver

Answer 17

Ni(mainly)
Cu
Zn

Question 18

Role of Na3AlF6 and CaF2 in Al metallurgy

Answer 18

Lowers MP, brings conductivity