Give a brief account of the following processes as used in extraction of metals:
(a) Smelting
(b) Magnetic separation
What do you understand by the following terms: (i) Roasting, (ii) Calcination, (iii) Smelting?
Describe mainly with balanced chemical equations.
(a) Copper from copper pyrites by self reduction.
(b) Zinc from zinc blende by carbon reduction.
(c) Silver from silver glance by cyanide process.
(a) How is aluminium extracted from alumina?
(b) Give balanced equations for the extraction of aluminium from bauxite by electrolysis.
(c) What is the function of cryolite in the extraction of Al from Al2O3.