Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1991-09-26
1993-11-16
Silverman, Stanley S.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210730, 210734, 210747, 210906, 210907, 209 5, 299 7, C02F 156
Patent
active
052620646
ABSTRACT:
A method of dewatering mineral-containing phosphatic clay sludge comprising adding to the sludge (a) an aqueous solution or emulsion of acrylamide polymer flocculating agent and (b) a microfiber additive. By using this method, such mineral-containing sludges can be quickly dewatered into a cake comprising 25-35% solids which can then be further processed to a 60% solids-containing material. The method is particularly suitable for use in methods for treating, recovering, rehabilitating and recycling residue of mining operations. With modification, the method is also suitable for dewatering organic sludges.
REFERENCES:
patent: 4260488 (1981-04-01), Condolios
patent: 4559143 (1985-12-01), Asada et al.
patent: 4710298 (1987-12-01), Noda
patent: 4931190 (1990-06-01), Laros
Investigation 8611 titled "Large Scale Dewatering of Phosphatic Clay Waste from Central Florida," Schriner et al., U.S. Dept. of Int., Bur. of Mines.
Investigation No. 8349 titled "Flocculation Dewatering of Florida Phospha-Clay Wastes" Smelley et al., pub. U.S. Dept. of Int. Bur. of Mines.
Information Circular 8668 titled "The Florida Phosphate Slimes Problem" pub. by the United States Dept. of Interior, Bureau of Mines.
Pub. 02-017-021 "The state of the Art of Phosphatic Clay Dewatering Technology and Disposal Techniques" Dept. of Interior Bur. of Mines Sep. 1983.
Report No. 661 titled "Disposal of Phosphate Tailing," Davenport et al., published in 1953.
Nalco Chemical Company product bulletin titled "NALCO.RTM. 7877 Mineral Processing Flocculant".
Florida Institute of Phosphate Research
McCarthy Neil M.
Silverman Stanley S.
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