Classifying – separating – and assorting solids – With heat treatment
Patent
1985-03-28
1986-04-01
Hart, Charles
Classifying, separating, and assorting solids
With heat treatment
209172, 203 96, B03B 100
Patent
active
045796505
ABSTRACT:
A process for enhancing coal by removing the gangue (rock, shale, iron pyrites and the like) associated with the mined coal as it comes from the crushers before further treatment. The process described slurries the crushed run of the mine (ROM) coal with a heavy medium, such as perchloroethylene, for a short period of time at ambient or below temperatures, (i.e. slurry times of 5-30 minutes and temperatures of 90.degree. C. to below -10.degree. C.); thereafter allowing, in a substantially quiescent environment, the solids to settle or float as their inherent densities are greater or lesser respectively than the density of the heavy medium. After settling the float solids (mostly coal of lower sulfur and ash content) are separated from the heavy medium as one stream and the sink solids (mostly the gangue) as a second stream. These solids are each washed with hot (90.degree. C.-100.degree. C.) water and the vapor azeotrope which forms from the water and heavy medium mixture (azeotrope) removed. The now water wet solids are separated from the body of hot water and sent for further processing or loading. The solids, both the coal and the gangue, have a heavy medium content of less than about 400 parts heavy medium per million parts solids.
REFERENCES:
patent: 3347370 (1967-10-01), Rampacek
patent: 4173530 (1979-11-01), Smith et al.
patent: 4198289 (1980-04-01), Elliott et al.
patent: 4324560 (1982-04-01), Fenseca
Nankee Robert J.
Vivian Thomas A.
Baker Glwynn R.
Hart Charles
The Dow Chemical Company
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