Ceca S.a.

Jean C Tracez

Pierre Blazy

Philippe Haicour

Jacques Bessiere

Robert Houot

Rene A Brouard

Robert Joussemet

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

The present invention relates to novel mixtures based on fatty diamines used for the preparation of surface active agents intended for the preparation of emulsions of hydrocarbon binders, wherein the fatty diamines of said mixtures have the formula: ##STR1## in which R is a saturated or non-saturated alkyl radical having from 8 to 22 carbon atoms, and 2.ltoreq.n.ltoreq.6.

Use of novel amines as bases for the preparation of emulsions of

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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Arras, France

Jean C Tracez