Ceca S.a.

Societe Nationale Elf Aquitaine

Philippe Haicour

Pierre Blazy

Jean C Tracez

Henri Grangette

Jacques Bessiere

El Aid Jdid

Robert Joussemet

Michel Crambes

Pierre Pivette

Robert Houot

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

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

The method for the inhibition of corrosion of ferrous metals in an aqueous medium consists in adding to the aqueous medium 10 to 2000 ppm of a mixture constituted by a water-soluble complex salt of a metal of groups II to VIII of the periodic table and of a hydroxycarboxylic acid and by a phosphoric ester of alkanolamine.

Method for the inhibition of corrosion of ferrous metals in an aqueous

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Paris, France

Philippe Haicour