Write the principle of the following :
(a) Hydraulic washing
(b) Chromatography
(c) Froth-floatation process
(a)Hydraulic washing
Principle: It is based on the difference in the specific gravities of the gangue particles and the ore particles.
(b) Chromatography
Principle: It is based on selective distribution of the various constituents of a mixture between two phases, a stationary phase and a moving phase.
(c) Froth- floatation process
Principle: It is based on the difference in the wetting properties of the ores particles and gangue particles by oil and water respectively.