Phosphate recovery processes

Details Phosphate recovery processes Phosphate recovery processes

1995-06-07

1997-11-18

Lithgow, Thomas M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210738, 210907, 209 5, B03D 306, B01D 2101

Patent

active

056884044

ABSTRACT:
A phosphate feed is separated into an enriched phosphate fraction and a waste aqueous stream which includes recoverable phosphate feed particles in an aqueous clay slime and which is flowed along a flow passage through a settling zone (where recoverable phosphate feed is recovered) into a quiescent sedimentation area where the slime settles, and water soluble polymeric flocculant for the slime is added to the aqueous stream to promote settling of the phosphate feed particles substantially without settling of slime in the settling zone and to accelerate sedimentation of flocculated slime in the sedimentation zone.

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Zhang et al., Minerals Engineering, vol. 8, No. 4/5, pp. 523-534 (1995).
Review of conventional practice in the industry on pp. 1-3 of the above-identified application.
"The Preparation and Evaluation of Superior Flocculating Agents for Phosphate Slimes" Progress Report NYO-7403, Oct. 30, 1956 United States Atomic Energy Commission La Mer et al.
"Chemical and Physical Beneficiation of Florida Phosphate Slimes", Bureau of the Mines Report #6163, 1963, Gary et al.

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