Flocculation of high solids mineral slurries

Details Flocculation of high solids mineral slurries Flocculation of high solids mineral slurries

1986-06-11

1988-05-03

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

106288B, 209 5, 210727, 210734, 501148, C02F 156

Patent

active

047418389

ABSTRACT:
Aqueous mineral slurries containing 10% by weight or more of finely divided mineral solids are flocculated prior to dewatering and/or thickening to obtain improved throughput and/or to reduce moisture in the dewatered product, by treating the slurries with polymers comprising at least about 1% by weight 2-acrylamido-2-methyl propyl sulfonic acid copolymerized with acrylamide and/or other suitable water-soluble monomers. The polymers must have a Brookfield viscosity of at least 7000 cps at 7.5% concentration in water. Flocculation of the mineral slurries with these polymers also provides improved re-dispersibility of the dewatered mineral in the filter cake. During redispersion, additional dry mineral may be added to obtain a final solids content as high as 70% or more. The Brookfield viscosity of the final high solids slurry comprising a significant portion of filter cake treated with the flocculants of this invention is not detrimentally affected.

REFERENCES:
patent: 3539003 (1970-11-01), Bidwell
patent: 3617573 (1971-11-01), Monagle
patent: 3692673 (1972-09-01), Hoke
patent: 3737333 (1973-06-01), Sawyer, Jr.
patent: 3879283 (1975-04-01), Mercade
patent: 4077930 (1978-03-01), Lim et al.
patent: 4186027 (1980-01-01), Bell et al.
patent: 4334985 (1982-06-01), Turner, Jr.
patent: 4372653 (1982-08-01), Halverson
patent: 4509987 (1985-04-01), Farrar et al.

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