Method of solution mining of coal

Details Method of solution mining of coal Method of solution mining of coal

1973-12-19

1976-11-09

Purser, Ernest R.

Wells

Processes

Separating material entering well

44 1B, 166303, 175 64, 299 4, E21B 4325, E21C 4100

Patent

active

039905136

ABSTRACT:
A solvent of coal is pumped through pipes drilled into the earth to a coal seam. The coal is digested or dispersed into the solvent and solvent recycle, and is thereafter pumped as a solution up to the surface and processed to remove the coal from the solvent. The method produces low-ash coal, stripped of all the extraneous ash, leaving the inherent ash, and stripped of all the sulfur except the organic type. The method comprises making a coal solution in situ and bringing it to the earth surface economically, without the hazards and environmental problems of conventional coal mining and without the need of coal washing facilities.

REFERENCES:
patent: 1532826 (1925-04-01), Lessing
patent: 2595979 (1952-05-01), Pevere et al.
patent: 3010707 (1961-11-01), Craighead
patent: 3240566 (1966-03-01), Bullough et al.
patent: 3341447 (1967-09-01), Bull et al.
patent: 3375188 (1968-03-01), Bloomer
patent: 3594304 (1971-07-01), Seitzer et al.
patent: 3645885 (1972-02-01), Harris et al.
patent: 3726785 (1973-04-01), Keller et al.
patent: 3766982 (1973-10-01), Justheim
Van Krevelen, "Coal Constitution and Solvent Extraction," Fuel July 1965, pp. 229-241.

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