MIXTURE FOR DISSOLVING METAL OXIDES AND DISSOLVING METHOD Russian patent published in 1997 - IPC

FIELD: metal purification. SUBSTANCE: invention focuses on purifying metals before subjected to subsequent treatment, removal of deposits from equipment, treatment of radioactive materials, etc. Mixture for dissolving metal oxides contains di- or polyphosphonic acid and reducing agent: sodium dithionite or formaldehyde- sodium sulfoxylate. Amounts of components contained in mixture are sufficient to ensure synergistic effect in respect to metal oxide dissolving process. Mixture may be supplemented by corrosion inhibitors or pH controlling agents. EFFECT: intensified procedure. 21 cl, 8 tbl