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Process for the purification of wet-process phosphoric acid by removal of cadmium
Process for the purification of wet-process phosphoric acid by removal of cadmium
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机译:通过去除镉提纯湿法磷酸的方法
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摘要
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.PPThe collector agent is selected from the group of dithiophosphoric acid esters and the alkali metal salts thereof.
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