Fine coal cleaning via the micro-mag process

Details Fine coal cleaning via the micro-mag process Fine coal cleaning via the micro-mag process

1990-01-03

1991-06-11

Medley, Margaret B.

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

C10L 1000

Patent

active

050228927

ABSTRACT:
A method of cleaning particulate coal which is fed with a dense medium slurry as an inlet feed to a cyclone separator. The coal particle size distribution is in the range of from about 37 microns to about 600 microns. The dense medium comprises water and ferromagnetic particles that have a relative density in the range of from about 4.0 to about 7.0. The ferromagnetic particles of the dense medium have particle sizes of less than about 15 microns and at least a majority of the particle sizes are less than about 5 microns. In the cyclone, the particulate coal and dense-medium slurry is separated into a low gravity product stream and a high gravity produce stream wherein the differential in relative density between the two streams is not greater than about 0.2. The low gravity and high gravity streams are treated to recover the ferromagnetic particles therefrom.

REFERENCES:
patent: 3999958 (1976-12-01), Iannicelli
patent: 4081251 (1978-03-01), Colli
patent: 4133747 (1979-01-01), Visman
patent: 4140628 (1979-02-01), Horsfall
patent: 4345994 (1982-08-01), Leonard et al.
patent: 4432868 (1984-02-01), Aldrich
patent: 4470901 (1984-09-01), Burgess

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