Which of the following benefication processes is used for the mineral, $A l_{2} O_{3} .2 H_{2} O$ ?

Froth-flotation

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Liquation

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Leaching

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Magnetic separation

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Solution

The correct option is D Leaching
Leaching: It involves treatment of ore with leaching agents (like $N a O H, N a C N, K C N$ or other reagents) due to which ore becomes soluble and their impurities remain insoluble. The leaching process is basically done in the extraction of Al from $A l_{2} O_{3} .2 H_{2} O$ (Alumina).

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