METHOD OF PROCESSING INDUSTRIAL PRODUCTS OF AFFINAGE OF PLATINUM GROUP METALS Russian patent published in 1995 - IPC

FIELD: procession of industrial products of affinage of platinum metals. SUBSTANCE: method comprises steps of sintering an initial material with barium peroxide, leaching the cake by water and acidifying a pulp, had been formed, by nitric acid at air blowing up to pH less, than 2; neutralizing the pulp, had been produced, by alkali up to pH 6-9; maintaining before filtration process S:L, being equal to 14-15; depositing barium sulfate by sulfuric acid from nitric acid solution, had been formed after filtration, until setting pH 0.3-0.5; performing leaching of platinum metals by hydrochloric acid from a residue of nitric acid leaching; using for the nitric acid leaching a filtrate, had been received after deposition of barium sulfate; feeding gases, had been formed upon the nitric acid leaching, through an absorbing solution. EFFECT: enhanced efficiency of procession. 3 cl, 6 tbl