Process for producing high-purity coal

Details Process for producing high-purity coal Process for producing high-purity coal

1976-02-02

1979-01-16

Dees, Carl

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

201 17, C10L 910, C10B 5700

Patent

active

041347374

ABSTRACT:
High-purity coal useful in the production of high-purity carbon is produced by treating coal to remove the impurities therein. The coal, which may be subject to conventional pretreatment processes such as beneficiation processes or the like, digested in a caustic solution to solubilize certain of the impurities in the coal and to chemically react with other impurities to form acid soluble products. The digested coal is then filtered to separate the partially purified coal from the caustic and soluble impurities dissolved therein. The coal is then treated with a mineral acid to dissolve the acid soluble products contained in the coal. Finally, the coal is subjected to a nitric acid treatment to remove metal sulfides. The resultant high-purity carbon contains less than 0.1% by weight ash or metal sulfides.

REFERENCES:
patent: 3393978 (1968-07-01), Murphy et al.
Reggel et al, Preparation of Ash-Free, Pyrite-Free Coal by Mild Chemical Treatment, ACS, Div. of Fuel Preprints, vol. 17, pp. 44-48 (1972).

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