METHOD OF ELECTROCHEMICAL OXIDATION OF CERIUM

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FIELD : chemistry. SUBSTANCE : invention relates to the processing of a concentrate of REM with separation of cerium from it by the method of electrooxidation, namely to the method of electrochemical oxidation of cerium (III) in nitrate solutions during the processing of rare-earth metal concentrates (REM), followed by extraction or precipitation of cerium carbonate or oxalate. The method involves the electrochemical oxidation of cerium in a nitrate solution in a two-cell electrolysis cell with a ceramic porous diaphragm made by the plasma chemical method. An insoluble titanium anode coated with iridium dioxide is used. The process is carried out at an operating temperature of 35-47°C and a gradual decrease in the anode current density as the concentration of cerium (+III) decreases. Cathode cell space, the catholyte level is supported above the level of anolyte. EFFECT : process simplification, increase in current output by increasing the speed of oxidation of cerium. 3 cl, 3 ex