Method for cleaning fine coal

Details Method for cleaning fine coal Method for cleaning fine coal

1983-08-08

1985-07-16

Nozick, Bernard

Classifying, separating, and assorting solids

Plural, diverse separating operations

Aqueous suspension, sifting, and stratifying

209172, 209173, 209211, B03B 700

Patent

active

045295069

ABSTRACT:
A method for cleaning fine coal is provided which includes: mixing the coal with a fluid of such a specific gravity that clean coal particles would float while refuse particles would sink therein, pretreating the coal-fluid slurry by adding a surfactant, subjecting the mixture to ultrasonic dispersion, and separating the entire mixture into higher and lower specific gravity fluid streams by means of centrifugal separation. The fluid of the chosen specific gravity and the surfactant may be recovered from the fluid streams and recycled if desired.

REFERENCES:
patent: 1656270 (1928-01-01), Downs et al.
patent: 2109234 (1938-02-01), Keenan
patent: 2571835 (1951-10-01), Cleeman
patent: 2896922 (1959-07-01), Pohlman
patent: 2907455 (1959-10-01), Sasaki
patent: 3992288 (1976-11-01), Kling
patent: 4252639 (1981-02-01), Smith et al.
patent: 4410423 (1983-10-01), Walsh

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