Phosphorus recovery from phosphorus-containing pond sludge

Details Phosphorus recovery from phosphorus-containing pond sludge Phosphorus recovery from phosphorus-containing pond sludge

C - Chemistry, Metallurgy

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C01B 25/01 (2006.01) C01B 25/02 (2006.01) C01B 25/027 (2006.01)

Patent

CA 1287478

Case 4944 WGG/smk 10/02/86 PHOSPHORUS RECOVERY FROM PHOSPHORUS-CONTAINING POND SLUDGE ABSTRACT A process is described for recovering phosphorus from pond sludge found in ponds located near phosphorus plants. An aqueous solution of the sludge, which has a phosphorus concentration in the range of 5% to 70% by weight, is heated at a temperature in the range of 165°F to 212°F, preferably for about 1/2 hour to about 6 hours, washed with water at an elevated temperature, and then reheated. A phosphorus layer having an enhanced concentration of recoverable elemental phosphorus is formed as a result of this process.

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