Method of purifying phosphoric acid of heavy metals

Details Method of purifying phosphoric acid of heavy metals Method of purifying phosphoric acid of heavy metals

C - Chemistry, Metallurgy

01

B

23/76

C01B 25/222 (2006.01)

Patent

CA 1156427

A B S T R A C T A method of removing heavy metals, particularly cadmium, from wet- process phosphoric acid produced by digesting raw phosphoric mate- rial with sulphuric acid, by precipitating out the heavy metals in sulphide form. The residual sulphuric acid is removed first by neu- tralization with alkali or as a not-readily dissolved sulphate precipitate. Alkali is added to obtain an Me/P ratio within the range of about 0.05-0.3, where Me is the number of cation equivalents in the alkali and P is the number of phosphorous atoms in the phos- phoric acid , whereafter the heavy metals are precipitated out by adding a sulphide compound which is soluble in the phosphoric acid, and the sulphide precipitate removed.

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