Q.
The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as
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General Principles and Processes of Isolation of Elements
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Solution:
Hydraulic washing is based on the difference between specific gravities of the ore and the gangue particles. It is, therefore, a type of gravity separation. In one such process, an upward stream of running water is used to wash the powdered ore. The lighter gangue particles are washed away and the heavier ore particles are left behind.