Decontamination of wet-processed phosphoric acid

Details Decontamination of wet-processed phosphoric acid Decontamination of wet-processed phosphoric acid

C - Chemistry, Metallurgy

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B

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C01B 25/234 (2006.01) C01B 25/46 (2006.01)

Patent

CA 1141941

DECONTAMINATION OF WET-PROCESSED PHOSPHORIC ACID ABSTRACT OF THE DISCLOSURE: The invention relates to the decontamination of wet-processed phosphoric acid with the use of organic solvents in a plurality of extraction zones, of which each is comprised of a mixing zone and a separating zone, the solvent being immiscible or partially miscible with water. Resulting organic phase and the aqueous phase are contacted countercurrently with respect to one another, the organic solvent phase being dispersed in the aqueous phase. To this end, the invention provides for the aqueous phase to be admitted to the mixing zone at the onset of the extraction, and for organic phase an aqueous phase to be continuously admitted in a volume ratio of at least 2.5 : 1 to the respective extracting zones in an overall quantity sufficient to provide, in the mixing zones of the extraction zones, a volume ratio of organic phase to aqueous phase of at most 1 : 1, which is maintained therein.

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