Describe the principle involved in each of the following process of metallurgy.
a) Froth Floatation method
b) Electrolytic Refining of Metals
c) Zone refining of Metal

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Solution

1) Froth flotation is based on the different melting characteristics of the ore and gangue particles with water and oil.

2) Electrolytic refining is used to remove minute impurities and take the purification to $99.9$ % by the use of electricity.

3) Zone refining is based on the principle that an impure metal on solidification will deposit crystals of pure metal and impurities will remain behind in the molten part of metal.

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Outline the principles of refining of metals by the following methods:

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(ii) Electrolytic refining

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Out line the principles of refining metals by the following method:

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Vapour phase refining

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