USE OF COMPOUNDS COMPRISING AMIDE AND PHOSPHONATE FUNCTIONS FOR EXTRACTING URANIUM(VI) FROM AQUEOUS SOLUTIONS OF SULPHURIC ACID, RESULTING IN PARTICULAR FROM SULPHURIC ACID LEACHING OF URANIUM-COMPRISING ORES

摘要

The invention relates to the use of compounds of general formula (I) hereinafter in which: R1 and R2 represent a linear or branched, saturated or unsaturated C6 to C12 hydrocarbon-based group; R3 represents H, a linear or branched, saturated or unsaturated C1 to C12 hydrocarbon-based group optionally comprising one or more heteroatoms, or a monocyclic saturated or unsaturated C3 to C8 hydrocarbon-based group optionally comprising one or more heteroatoms; while R4 represents a linear or branched, saturated or unsaturated C2 to C­8 hydrocarbon-based group, or a monocyclic aromatic group; as extractants, for extracting uranium(VI) from an aqueous solution of sulphuric acid. It also relates to a process which makes it possible to recover the uranium present in an aqueous solution of sulphuric acid resulting from the leaching of an uranium-comprising ore with sulphuric acid and which uses said compounds as extractants. Uses: treatment of uranium-comprising ores with a view to exploiting the uranium present in these ores.