Method for removing cadmium from phosphoric acid

Details Method for removing cadmium from phosphoric acid Method for removing cadmium from phosphoric acid

C - Chemistry, Metallurgy

01

B

C01B 25/238 (2006.01) B01D 11/00 (2006.01) B01F 17/00 (2006.01) C01G 11/00 (2006.01) C22B 3/38 (2006.01)

Patent

CA 2062942

ABSTRACT Method for removing cadmium from phosphoric acid by the use of the permeation process through a liquid membrane. The method is comprised of: a) formulating an emulsion of the aqueous-in-organic type wherein the dispersed aqueous phase is the re-extraction phase and the organic phase contains an extraction agent of formula (1) wherein R1 and R2 are aliphatic, arylic or aromatic radicals and n can be simultaneously 1 or 0; b) dispersing said emulsion in a phosphoric acid solution; c) removing the aqueous phase which contains the cadmium-free phosphoric acid; and d) breaking the cadmium-laden emulsion to recycle the extraction agent. The obtained phosphoric acid may have a cadmium content of 1.5 ppm and may be used in the production of fertilizers. A preferred emulsion contains bis (2,4,4- trimethylpentyl) monothiophosphinic acid as agent for the selective extraction of cadmium.

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