Flocculation of coal fines with polyelectrolytes and electrolyte

Details Flocculation of coal fines with polyelectrolytes and electrolyte Flocculation of coal fines with polyelectrolytes and electrolyte

1988-11-03

1990-03-06

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

209 5, 210734, 210735, C02F 156

Patent

active

049063863

ABSTRACT:
Coal fines are flocculated from an aqueous suspension by adding an anionic polyelectrolyte, a soluble calcium salt, and a cationic polyelectrolyte to the suspension. The anionic polyelectrolyte is preferably a high charge density, high molecular weight acrylic acid/acrylamide copolymer or a high charge density high molecular weight terpolymer of acrylic acid/methacrylic acid/ethylacrylate. The cationic polyelectrolyte is preferably a high molecular weight, low charge density dimethylamino methylmethacrylate methyl chloride quaternary ammonium salt/acrylamide copolymer, an N,N dimethyl 2 hydroxy propyl imine homopolymer or low molecular weight, a diallyl dimethyl ammonium chloride polymer, or ter polyepichlorohydrin dimethyl amine.

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