Conversion of extraction residues originating from phosphoric ac

Details Conversion of extraction residues originating from phosphoric ac Conversion of extraction residues originating from phosphoric ac

1980-03-07

1981-07-21

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, 423321S, C01B 1516, C01B 2526

Patent

active

042798760

ABSTRACT:
The invention relates to a process permitting acid salt residues, hereinafter called raffinates, which are obtained in the decontamination of phosphoric acid by extraction with a solvent, to be converted to solid deposition 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 aqueous 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 reaction 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.

REFERENCES:
patent: 4104079 (1978-08-01), Fujii et al.

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