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Which types of ores are purified by hydr...

Which types of ores are purified by hydraulic washing ? Give two examples also.

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Heavy ores like `Fe_(2)O_(3)`. Haematitie, `CuCO_(3)*Cu(OH)_(2)` Malachite.
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AAKASH INSTITUTE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Try Yourself
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