| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate the treatment of a raw material, to dissolve environmental deterioration caused by odors and moreover to increase the recovering ratio of Pd at the time of recovering Pd from a Pd waste solution. SOLUTION: This method is provided with a Pd waste solution separating stage in which a Pd waste solution is mixed with an intermediate including Ag recovered in a stage in which the raw material including noble metals has been subjected to wet treatment and the resultant mixture is heated under reduced pressure to separate and recover solid Pd residue and liquid oil, a raw silver plate producing stage in which the solid Pd residue is charged to an oxidizing furnace together with the intermediate to obtain a raw silver plate, a precipitate recovering stage in which, while the raw silver plate is formed into electric silver by silver electrolysis, precipitates containing Pd are recovered, and a precipitation treating stage in which the Pd-containing precipitates are subjected to a parting treatment to obtain Pd.</p> |
