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Which unit operation mentioned below is not involved in cement rock beneficiation?

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Which unit operation mentioned below is not involved in cement rock beneficiation?

(a) Grinding

(b) Flotation

(c) Thickening

(d) Compression

I have been asked this question in an interview for job.

My enquiry is from Inorganic Chemical in division Inorganic Chemical Industries of Chemical Technology

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Correct answer is (d) Compression

Easiest explanation: The unit operations which are involved in cement beneficiation are grinding, classification, flotation, thickening etc. Rock is wet-ground, fed to a hydro separator where the overflow goes directly to the final thickener.

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