Coal purification and electrode formation

Details Coal purification and electrode formation Coal purification and electrode formation

1976-02-23

1978-04-11

Vertiz, O. R.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

423461, 44 1R, 204294, C01B 3102, C09C 148, C09C 156, C10G 2904

Patent

active

040839400

ABSTRACT:
A process for purification of coal comprises forming an aqueous leaching solution containing nitric and hydrofluric 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.degree. to 100.degree. 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. Thereafter, the solution is removed and the leached coal washed with water.

REFERENCES:
patent: 1489830 (1924-04-01), Illingworth
patent: 1840491 (1932-01-01), Dietsche
patent: 3279935 (1966-10-01), Daniell et al.
patent: 3393978 (1968-07-01), Murphy et al.
patent: 3501272 (1970-03-01), Benak
Coal as a Source of Electrode Carbon in Aluminum Production, Bureau of Mines Report of Investigations, pp. 7, 8, and 1-6.

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