Chemical leaching of coal to remove ash, alkali and vanadium

Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing

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44 1R, 44 15R, C10L 132

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045825122

ABSTRACT:
Powdered coal is upgraded in utility and heat value by removal of ash and pyrite constituents by successively pressure caustic leaching the coal slurry at a temperature of at least about 175.degree. C., hydrochloric acid leaching the caustic leached coal to dissolve ash and pyrite residues not dissolved by the caustic, and pressure leaching the acid leached coal to remove alkali metals and chloride. Vanadium is also removed by the process.

REFERENCES:
patent: 200663 (1878-02-01), Morey
patent: 2162221 (1939-06-01), Kasehagen et al.
patent: 2739105 (1956-03-01), Ford et al.
patent: 2878163 (1959-03-01), Hutchings
patent: 3214346 (1965-10-01), Mason et al.
patent: 3393978 (1968-07-01), Murphy et al.
patent: 3993455 (1976-11-01), Reggel et al.

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