Ceca S.a.

Uranium Pechiney

Institut National De Recherche Chimique Applique

Pierre Blazy

Jean C Tracez

Philippe Haicour

El A Jdid

Jacques Bessiere

Antoine Floreancig

Robert Houot

Michele Prevost

Marc Lebon

Robert Joussemet

El Aid Jdid

Separation and recovery of solids from liquids containing them using the

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

The present invention relates to an enrichment process, by flotation, of sedimentary ores containing phosphate, and comprising a gangue of the carbonated type and in some cases a gangue of the siliceous type, wherein an amphoteric product of formula ##STR1## is at least used as collecting agent, in which formula: R is of form R.sub.1 or R.sub.1 O--, R.sub.1 being a saturated or unsaturated alkyl radical, either linear or branched, and comprising between 5 and 19 carbon atoms.

Enrichment process by flotation of phosphate-containing ores with

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Nancy, France

Pierre Blazy