The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?
Correct answer: B. Sand (40%)
- A. Carbon tetrachloride
- B. Sand (40%)
- C. Mineral oil of high viscosity & specific gravity (1.6)
- D. None of these
Explanation
Coal washery liquids commonly use water mixed with sand to form a dense medium for separating coal from heavier mineral matter. The stated mixture is therefore water with about 40% sand.
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