SELECTIVE PURIFICATION OF ARSENICAL MATERIAL DURING AN ALKALINE PROCESS FOR THE TREATMENT OF A URANIUM-BEARING AND/OR MOLYBDENUM-BEARING MINERAL BY MEANS OF A MAGNESIUM COMPOUND

摘要

Process for the selective purification during a hot oxidizing treatment of a uranium-bearing and/or molybdenum-bearing mineral containing arsenical materials, comprising the etching of such mineral by means of an aqueous liquor of sodium or potassium carbonate and/or bicarbonate, said etching being carried out according to conditions of concentrations, temperatures and pressures causing the solubilization of the uranium and/or molybdenum and the arsenic present in the mineral, and collecting a suspension of a solid phase in a liquid phase, and finally separating said phases, the purification process being characterized in that the solubilized arsenic during the etching is extracted in the form of magnesium arseniate by treatment of the medium containing the arsenic by means of a magnesium compound.