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

PCT No. PCT/FR82/00128 Sec. 371 Date Mar. 7, 1983 Sec. 102(e) Date Mar. 7, 1983 PCT Filed Jul. 27, 1982 PCT Pub. No. WO83/00509 PCT Pub. Date Feb. 17, 1983.A process for the selective removal of arsenical material in the course of a process for the hot oxidizing attack on a uraniferous and/or molybdeniferous ore containing arsenical materials, comprising attacking said ore with an aqueous liquor of sodium or potassium carbonate and/or bicarbonate, said attack operation being carried out under conditions with respect to levels of concentration, temperatures and pressures which cause solubilization of the uranium and/or molybdenum and the arsenic present in the ore, then collecting a suspension of a solid phase in a liquid phase, and finally, separating said phases, wherein the arsenic which is solubilized in the attack operation is extracted in the form of magnesium arsenate by treating the material containing the arsenic with a magnesium compound.