Method of extracting coal from a coal refuse pile

Details Method of extracting coal from a coal refuse pile Method of extracting coal from a coal refuse pile

1989-09-18

1991-07-30

Dees, Carl F.

Fuel and related compositions

From vegetation or refuse

44625, C10L 500, C10L 906

Patent

active

050357220

ABSTRACT:
A method of extracting coal from a coal refuse pile comprises soaking the coal refuse pile with an aqueous alkali solution and distributing an oxygen-containing gas throughout the coal refuse pile for a time period sufficient to effect oxidation of coal contained in the coal refuse pile. The method further comprises leaching the coal refuse pile with an aqueous alkali solution to solubilize and extract the oxidized coal as alkali salts of humic acids and collecting the resulting solution containing the alkali salts of humic acids. Calcium hydroxide may be added to the solution of alkali salts of humic acid to form precipitated humates useable as a low-ash, low-sulfur solid fuel.

REFERENCES:
patent: 4054420 (1977-10-01), Loganbach
patent: 4055400 (1977-10-01), Stambaugh et al.
patent: 4522626 (1985-06-01), Espenscheid

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