Beneficiation of low-rank coals by immersion in residuum

Details Beneficiation of low-rank coals by immersion in residuum Beneficiation of low-rank coals by immersion in residuum

1983-02-28

1984-07-24

Gantz, Delbert E.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

44 1R, 44 1C, 208 8LE, 34 9, C10L 516, C10L 900, F26B 300

Patent

active

044616244

ABSTRACT:
A method of improving the calorific value and preventing autogenous heating of low-rank coals is disclosed which comprises crushing the coal into a particle size range from 0.1 cm to 3 cm, immersing the particles in a distillation residuum of petroleum crude oil at a temperature between 240.degree. C. and decomposition temperature of the coal, and draining excess residuum from the particles to give a product preferably containing 2% to 15% by weight of the residuum. Some suitable residua are the vacuum residuum of a hydrogen donor-refined Athabasca bitumen and low-penetration asphalt. The residuum coating material must have a softening point of at least 80.degree. C. The decomposition temperature is defined as the temperature for a particular coal at which its rate of weight loss upon heating first reaches a maximum value, and is in the range of 340.degree. C. to 350.degree. C. for most low-rank coals.

REFERENCES:
patent: 1808340 (1931-06-01), Botch
patent: 1912697 (1933-06-01), Fife
patent: 3961914 (1976-06-01), Kindig et al.
patent: 3985516 (1976-10-01), Johnson et al.
patent: 4192650 (1980-03-01), Seitzer
patent: 4214875 (1980-07-01), Kromrey

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