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US 4,391,608 AGranted
Process for the beneficiation of carbonous materials with the aid of ultrasound
OwnerMichael A. Dondelewskiinventor
Life of this patent
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Abstract
A process for reducing the sulfur and ash content of coal and the like by treatment in an aqueous slurry with ultrasound followed by subsequent separating steps.
Claims7
A method of treating coal to reduce ash and sulfur content comprising the steps for:
- (a) combining the coal with water and oil to form a slurry, said oil being a semi-reactive oil containing esters of fatty acids,
- (b) applying ultrasound to said slurry to cause separation of ash from coal and sulfur including organic sulfur from coal,
- (c) physically separating coal and adhered oil from the slurry and washing to separate ash and sulfur from the coal to recover coal with reduced sulfur and ash content.
Dependencies are inferred from the claim text.