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Leaching

The process b...

Question

The process by which lighter earthy particles are freed from the heavier particles using water is/are ________________.

A

gravity separation

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B

Levigation

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C

hydraulic washing

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D

leaching

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Solution

The correct options are
A gravity separation
B Levigation
C hydraulic washing
Gravity separation/ Levigation/Hydraulic washing. All these methods are based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind. In leaching a suitable reagent (not water) dissolves the ore and not the impurities.Thus leaching is a chemical method of separation/ concentratlon of the ore from impurities.

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