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A method of purifying phosphoric acid of heavy metals


, : A method of purifying phosphoric acid of heavy metals. International Application Published under the Patent Cooperation Treaty PCT (WO 80/02418): 16

Heavy metals, particularly cadmium, are removed from wet-process phosphoric acid produced by digesting raw phosphate rock with sulphuric acid by precipitating out the heavy metals as sulphides. First, residual sulphuric acid is removed by neutralization with alkali or by precipitation as a not-readily dissolved sulphate.

US$29.90


Other references

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