Purification of phosphoric acid

Details Purification of phosphoric acid Purification of phosphoric acid

C - Chemistry, Metallurgy

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C01B 25/18 (2006.01) A23K 1/175 (2006.01) C01B 25/238 (2006.01) C05B 17/00 (2006.01)

Patent

CA 1112020

ABSTRACT Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions Or calcium and fluorine to cause precipitation Or, for example, a magnesium-containing precipitate. A preferred precipitant is one containing calcium fluoride, such as the sludge obtained by treating pond water from a phosphoric acid plant with a calcium-containing compound. Preferably, the soluble sulphate content of the phosphoric acid is maintained at at least about 2 by weight. An animal feed can be prepared from the precipitate by combining the precipitate with phosphate rock, water, and a sodium-containing compound, and then calcining the combination.

306165

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