Process for after-treating extraction residues originating from

Details Process for after-treating extraction residues originating from Process for after-treating extraction residues originating from

1982-08-27

1984-07-03

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210906, 423321R, 423321R, 423321S, 423166, C02F 152, C01B 2526

Patent

active

044578482

ABSTRACT:
The disclosure relates to a process for after-treating extraction residues, termed raffinates, originating from the extractive decontamination of crude phosphoric acid. To this end, the disclosure provides for the raffinates to be converted to two separate solid matter fractions of differant chemical composition by admixing the raffinates with a calcium compound so as to establish a pH-value of 1.2 up to 2.5. Next, the resulting precipitate consisting essentially of gypsum is filtered off as a first solid matter fraction, and washed with water. The resulting filtrate and the wash water are made into a mixture and predetermined proportions of calcium compound are added so as to obtain, after complete reaction, a fully reacted filter cake with a pH-value of 9 up to 12, the resulting suspension being filtered off at a pH-value of 6 to 8. The filter cake consisting essentially of calcium phosphate is separated as the second solid matter fraction, and allowed to react completely.

REFERENCES:
patent: 4256716 (1981-03-01), Skidar
patent: 4279876 (1981-07-01), Schrodter et al.
patent: 4285921 (1981-08-01), Mamourian et al.
patent: 4320012 (1982-03-01), Palm et al.
patent: 4374810 (1983-02-01), O'Neill

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