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

C - Chemistry, Metallurgy

10

L

44/6

C10L 9/10 (2006.01)

Patent

CA 1183349

ABSTRACT BENEFICIATION OF LOW-RANK COALS BY IMMERSION IN RESIDUUM 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°C and the 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 residuum 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°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°C to 350°C for most low-rank coals.

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