Process for the purification of wet-process phosphoric acid by removal of cadmium
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United States of America Patent
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Jan 6, 1987
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N/A
app pub date -
Dec 14, 1984
filing date -
Dec 23, 1983
priority date (Note) -
Expired
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Abstract
A process for the removal of cadmium contained in wet-process phosphoric acid by flotation by means of a cadmium-collector anionic surface active agent and an injected gas in the presence of other impurities including iron and possibly uranium which is characterized in that, in order to improve the removal of cadmium, the iron contained in the phosphoric acid in the trivalent state is reduced to the divalent state before the cadmium collector is introduced into the medium to be purified by flotation. The collector agent is selected from the group of dithiophosphoric acid esters and the alkali metal salts thereof.
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