| 摘要 |
<p>PURPOSE:To separate and extract platinum groups from the insoluble residues generated in nuclear fuel reprocessing by converting platinum group elements to fluorides. CONSTITUTION:The insoluble residues 1 are heated together with gaseous O2/N2 3 and thereafter, gaseous fluorine is fed thereto to effect fluorination reaction in a fluorinating and evaporating device 2. The formed and evaporated gas is sent to a cooling condenser 7. The fluorides of the solidified platinum group elements (ruthenium, rhodium, palladium, etc.) are separated from the carrier gas to obtain fine particles 9 of the fluorides in a cyclone capturing device 8. The fine particles 9 of the fluorides are charged into a fused salt electrolytic bath 10 which has the fused salt compsn. consisting of 66mol.% LiF and 34mol.% BeF and is heated to a high temp. Electrolytic refining is executed by inserting an anode electrode 11 and a cathode electrode 12 into the bath. Platinum group element-deposited lumps 13 deposited on the cathode electrode 12 are stripped and recovered. The platinum group elements are economically and efficiently recovered.</p> |
