Conversion of extraction residues originating from...

Details Conversion of extraction residues originating from... Conversion of extraction residues originating from...

C - Chemistry, Metallurgy

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B

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C01B 25/26 (2006.01) C01B 25/46 (2006.01) C02F 11/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 1136830

ABSTRACT OF THE DISCLOSURE The invention relates to a process permitting raffinates, which are obtained in the decontamination of phosphoric acid by extraction with a solvent, to be converted to solid de- position products, wherein the raffinates are admixed with a quantity of water necessary for them to ensure, after reaction with hydrate of lime or quicklime, the formation of an aquious filterable suspension. More particularly, the raffinates are admixed with a quantity of hydrate of lime or quicklime necessary for them to ensure, after reaction and filtration of the suspension, the formation of a filter cake having a pH-value within the range 9 to 14. The reac- tion suspension is filtered as soon as it has assumed a pH- value within the range 5 to 8 and the resulting filter cake is allowed to react completely and deposited.

347425

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