Method of removing phosphorus from sludge

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/02 (2006.01) C01B 25/02 (2006.01) C01B 25/027 (2006.01) C02F 1/58 (2006.01) C02F 11/00 (2006.01) C02F 1/38 (2006.01)

Patent

CA 2447123

A method of recovering elementary phosphorus from an aqueous sludge containing about 1 to about 15 wt% dispersed particles of phosphorus is disclosed. To the sludge is added about 1 to about 20 wt%, based on the weight of the phosphorus present in said sludge, of a phosphate salt that has the general formula (I) where R is an alkali metal or ammonium and n is 0 to 30. The phosphorus in the sludge is melted and the solids in the sludge are separated from liquid phosphorus and water. Liquid phosphorus is then separated from the water.

La présente invention concerne un procédé pour récupérer du phosphore élémentaire à partir d'une boue aqueuse contenant d'environ 1 à environ 15 % en poids de particules de phosphore dispersées. Selon ce procédé, on ajoute à cette boue d'environ 1 à environ 20 % en poids, sur la base du poids du phosphore présent dans la boue, d'un sel de phosphate de formule générale (I), dans laquelle R représente un métal alcalin ou de l'ammonium et n vaut de 0 à 30. Le phosphore présent dans la boue entre alors en fusion et les solides présents dans la boue sont séparés du phosphore liquide et de l'eau. Le phosphore liquide est ensuite séparé de l'eau.

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