Recovery of phosphorus from waste ponds

Details Recovery of phosphorus from waste ponds Recovery of phosphorus from waste ponds

C - Chemistry, Metallurgy

01

B

209/2, 23/324, 2

C01B 25/04 (2006.01) B03B 9/00 (2006.01) C01B 25/027 (2006.01)

Patent

CA 1197071

ABSTRACT OF THE DISCLOSURE Process for recovery of elemental phosphorus from waste ponds by dredging the waste pond to obtain an aqueous phosphorus slurry, separating particles larger than 2 mm from the slurry, treating the remaining slurry in an initial hydrocyclone and removing an overflow of solids larger than 500 micrometers, treating the under- flow from the initial hydrocyclones in smaller diameter hydrocyclones, removing a second overflow enriched in slimes and diminished in phosphorus, removing a second underflow enriched in phosphorus and diminished in slimes and heating it sufficiently to melt the phosphorus therein, treating the heated second underflow in a centrifugal separator, and separating and recovering a stream of coal- esced phosphorus from a heavy fraction of impurities.

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