Coal purification

Details Coal purification Coal purification

C - Chemistry, Metallurgy

01

B

196/11

C01B 31/02 (2006.01) C09C 1/48 (2006.01) C09C 1/56 (2006.01) C10C 1/20 (2006.01) C25C 3/12 (2006.01) H05B 7/085 (2006.01)

Patent

CA 1081150

Abstract of the Disclosure A process for purification of coal comprises forming an aqueous leaching solution containing nitric and hydrofluoric acid. Impurities are removed by contacting coal having a mesh size not greater than 8 (Tyler Series) with the leaching solution for a period of 15 to 120 minutes at a temperature of 20 to 100°C. During the contacting of coal with leaching solution, a gaseous material such as air can be bubbled therethrough to provide additional mixing action and oxidant material. There- after, the solution is removed and the leached coal washed with water.

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