Metallugical operations-Step 3-Reduction of oxide(Electrometallury of aluminium)

Question 1

Name the Process of electrometallurgy of aluminium

Answer 1

Hall-heroult process

Question 2

What is the role of cryolite in the metallurgy of aluminium?

Answer 2

Cryolite Na3AlF6 lowers the melting point of the alumina and brings conductivity.

Question 3

What is the tole of the graphite anodes?

Answer 3

The oxygen liberated at anode reacts with the carbon of anode producing CO and CO2. In this way the combination of molten aluminium produced at cathode and oxygen at anode to form alumina is prevented

Question 4

What is alumina?

Answer 4

Pure Al2O3 obtained by leaching of bauxite(ore of aluminium)

Question 5

What is electrometallurgy?

Answer 5

The process of extraction of metals by the electrolysis of their fused salts.

Question 6

When is electrometallurgy used?

Answer 6

When the metals to be extracted are highly electropositive.

Question 7

Name another metal that is extracted by electrometallurgy

Answer 7

sodium. calcium

Question 8

Name the process of extraction of sodium by electrolysis

Answer 8

Down’s process