Coal dewatering
AssigneeUnilever Patent Holdings B.V.
InventorMark E. Kenney
Life of this patent
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Abstract
In the vacuum filtering of coal slurries, dewatering of the filter cake is achieved by contacting the coal with a C.sub.8 to C.sub.20 aliphatic carboxylic acid or a derivative thereof, especially sodium oleate. Reductions in moisture levels are thereby achieved in a cost-effective manner.
Claims5
A process for dewatering an aqueous coal slurry filter cake comprising spraying the coal slurry filter cake with at least 5 g per tonne of filtered coal of a dewatering aid consisting essentially of a C.sub.8 to C.sub.20 aliphatic carboxylic acid or a derivative thereof selected from esters, amides and salts of fatty acids and applying a pressure differential across the cake to remove water therefrom.
Dependencies are inferred from the claim text.