Centre National De La Recherche Scientifique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Universitè De Montpellier

Universite Dé Lorraine

Ecole Nationale Superieure De Chimie De Montpellier

Areva Mines

Université De Chambéry

Guilhem Arrachart

Stéphane Pellet-Rostaing

Antoine Leydier

Fanny Mary

Raphaël Turgis

Raphael Turgis

Veronique Dubois

Manuel Miguirditchian

Agnès Grandjean

Gilles Bernier

Frédéric Goettmann

Jean Duhamet

Fabien Burdet

David Virieux

Christian Thomas

Elisabeth Zekri

Sophie Legeai

Micheline Draye

Véronique Dubois

Sabah El Mourabit

Nicolas Aychet

Gabriel Plancque

Julien Rey

Sandrine Dourdain

Sefkan Atak

Stephane Pellet-Rostaing

Moussa Toure

An extractant which makes it possible to extract both light rare earths and heavy rare earths from an aqueous phosphoric acid solution, likely to be present in this solution, and which is characterised in that it comprises: a compound of formula (I) below: wherein R1 and R2, identical or different, are a hydrocarbon group, saturated or unsaturated, linear or branched, in C6 to C12; R3 is a hydrocarbon group, in C1 to C6, or a hydrocarbon group, saturated or unsaturated, monocyclic, in C3 to C8; R4 and R5, identical or different, are a hydrogen atom or a hydrocarbonate group, saturated or unsaturated, linear or branched, in C2 to C8; and a surfactant. Applications of this extractant include treatment of aqueous solutions from the leaching of natural phosphates by sulphuric acid and aqueous solutions from the leaching of urban minerals by phosphoric acid, in view of making profitable use of the rare earths present in these solutions.

Extractant for rare earth extraction from aqueous phosphoric acid solutions and method of extraction

The invention relates to the use, as an extraction agent for extracting at least one rare earth from an aqueous phase including phosphoric acid, of at least one compound of the following general formula (I): where   The invention also relates to a method for recovering at least one rare earth using said compound, as well as to specific compounds as such.

Use of novel compounds for selectively extracting rare earths from aqueous solutions including phosphoric acid and associated extraction method

A method for extracting the tantalum from an acid aqueous phase A1 comprising at least one step comprising the bringing of the aqueous phase A1 into contact with a phase A2 not miscible with water, and then the separation of the aqueous phase A1 from the phase A2, the phase A2 consisting of one ionic liquid or a mixture of ionic liquids as an extractant. A method for recovering the tantalum that implements this extraction method and to a use of an ionic liquid or of a mixture of ionic liquids as an extractant, in order to extract the tantalum from such an aqueous phase A1.

Process for extracting and recovering tantalum present in an acid aqueous phase by means of an ionic liquid, and use of such an ionic liquid for extracting the tantalum from an acid aqueous phase

The invention relates to compounds which correspond to the general formula (I) below:  The invention also relates to the uses of these compounds as uranium(VI) ligands, in particular for extracting uranium(VI) from an aqueous solution of sulphuric acid, and also to a method that makes it possible to recover the uranium(VI) present in an aqueous solution of sulphuric acid resulting from the attack of a uranium ore by sulphuric acid and using said the compounds.

Compounds with phosphine oxide and amine functions, useful as uranium (VI) ligands, and uses thereof, in particular for extracting uranium(VI) from aqueous solutions of sulphuric acid

The invention relates to an organic-inorganic hybrid material which comprises an inorganic solid support on which are grafted organic molecules of the general formula (I) hereafter: and relates to methods allowing preparation of this hybrid material as well as to the uses of the hybrid material for extracting uranium(VI) from an aqueous medium comprising phosphoric acid.

Organic-inorganic hybrid material of use for extracting uranium (VI) from aqueous media containing phosphoric acid, processes for preparing same and uses thereof

New compounds which meet general formula (I): where:

Bifunctional compounds useful as ligands of uranium (VI), methods of synthesising same and uses thereof

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Saint-Laurent-des-Arbres, France

Guilhem Arrachart