Ceca S.a.

Uranium Pechiney

Jacques Bessiere

Pierre Blazy

Antoine Floreancig

Philippe Haicour

Jean C Tracez

El A Jdid

El Aid Jdid

The invention concerns the recovery of heavy metals from concentrated solutions. The process comprises complexing the metals with an organophosphorous complexing agent and recovering the metallic complex by sedimentation, filtration, flotation and the like. The process can be used to recover uranium and rare earths from phosphoric acid solutions.

Process for the recovery of uranium from phosphoric acid solutions

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.

Process for the purification of wet-process phosphoric acid by removal

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Gondreville, France

Jacques Bessiere