Methods of treating coal to remove sulfur and ash

Details Methods of treating coal to remove sulfur and ash Methods of treating coal to remove sulfur and ash

1981-06-15

1982-05-04

Dees, Carl F.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

201 17, C10L 906

Patent

active

043280021

ABSTRACT:
Methods of treating coal to remove sulfur and ash are provided which involve the steps of preconditioning coal particles in the presence of an aqueous solution of an oxidizing agent, washing said pretreated coal with water, contacting said coal with an aqueous solution of an oxidizing agent until an exothermic reaction between the coal and oxidizing agent peaks and the pH drops to the range of 2 to 3, removing the coal from the oxidizing agent, contacting the coal with a passivating agent until the temperature of the coal drops and the pH rises into the range 3 to 5, neutralizing the coal up to a pH of about 9, washing said coal with water and drying said coal.

REFERENCES:
patent: 4083940 (1978-04-01), Das
patent: 4097244 (1978-06-01), Burk, Jr. et al.
patent: 4197090 (1980-04-01), Yoo et al.
patent: 4256464 (1981-05-01), Ray

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