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US 4,290,896 AGranted
Dewatering fine coal slurries using organopolysiloxanes
AssigneeDow Corning Corporation
InventorsDavid J. Gordon, James K. Wessel
Life of this patent
Estimating the term…
Abstract
Aqueous slurries of fine coal are dewatered by a process which comprises mixing an organopolysiloxane with the slurry, separating the slurry to recover the fine coal and further drying the fine coal, if desired. The use of water-soluble organopolysiloxanes or water-emulsifiable organopolysiloxanes provides improved separating and/or improved drying of fine coal in the dewatering process that is disclosed.
Claims13
A process for dewatering an aqueous slurry of fine coal, said process comprising
- (I) mixing a dewatering-improving amount of a water-dispersible organopolysiloxane with the aqueous slurry of fine coal, said organopolysiloxane having the formula R.sub.a H.sub.b SiO.sub.(4-a-b)/2 wherein a and b are numbers, the sum of which has an average value of from greater than zero to less than four, b has an average value of from zero to a and R denotes an organic radical bonded to a silicon atom by a silicon-carbon bond,
- (II) separating the organopolysiloxane-containing aqueous slurry of fine coal into an aqueous portion and a fine coal portion, said fine coal portion having a water content of less than 20 percent by weight,
Dependencies are inferred from the claim text.