Process for deashing coal

Details Process for deashing coal Process for deashing coal

C - Chemistry, Metallurgy

10

L

44/1, 361/2

C10L 5/16 (2006.01) B03B 9/00 (2006.01) B03D 1/02 (2006.01) C10L 9/10 (2006.01)

Patent

CA 1296898

Abstract A process for deashing coal is disclosed, which comprises the following steps (a) to (e): (a) crushing coal to form crushed coal having a particle size under 15 mm, (b) producing an aqueous slurry comprising the crushed coal, 1 to 4 wt.% of a binder based on the crushed coal, and water, (c) agitating the aqueous slurry of crushed coal to allow ash in the crushed coal to disperse in the water and, at the same time, allow the coal particles in the crushed coal to tumble and agglomerate to thereby obtain an aqueous slurry of agglomerated coal, (d) separating the aqueous slurry of agglomerated coal by means of a solid-liquid separator into coarse agglomerated clean coal on a separating medium and an aqueous flurry of fine agglomerated clean coal and ash under the separating medium, and (e) adding a frother or a frother-based flotation reagent to the aqueous slurry of fine agglomerated clean coal and ash, and recovering the fine agglomerated clean coal by flotation.

493267

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