Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1991-10-15
1994-05-24
Lithgow, Thomas M.
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 21, 241 24, 241 77, 209 17, 209 38, 209 39, 2091725, 209214, 423632, 423633, B03B 532, B03B 700, B04C 500
Patent
active
053141245
ABSTRACT:
Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean coal, middlings, and refuse. Middlings are comminuted for beneficiation with the fine fraction. The fine fraction is deslimed in a countercurrent cyclone circuit and then separated as multiple fractions of different size specifications in dense medium cyclones. The dense medium contains ultra-fine magnetite particles of a narrow size distribution which aid separation and improves magnetite recovery. Magnetite is recovered from each separated fraction independently, with non-magnetic effluent water from one fraction diluting feed to a smaller-size fraction, and improving both overall coal and magnetite recovery. Magnetite recovery is in specially designed recovery units, based on particle size, with final separation in a rougher-cleaner-scavenger circuit of magnetic drum separators incorporating a high strength rare earth magnet.
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Genesis Research Corporation
Lithgow Thomas M.
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