| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of reducing a sulfur component produced in a process of recovering valuable metal included in a waste battery.SOLUTION: There is provided a method for recovering valuable metals where, from a waste battery or a process scrap including valuable metal of at least one kind of cobalt or nickel, the valuable metal is recovered, comprising: (1) a primary concentration step where the primary concentrate of the valuable metal is obtained through preliminary roasting treatment, pulverization treatment and sieving treatment; (2) a secondary concentration step where the primary concentrate is subjected to dissolution treatment with sulfuric acid and the solution is obtained as a secondary concentrate; (3) a tertiary concentration step where the secondary concentrate is added with an aqueous solution of alkali metal, after hydroxylation treatment, sulfur reduction treatment is performed by oxidation roasting treatment and water-washing treatment to obtain the tertiary concentrate of the valuable metal; and (4) a quaternary concentration step where the tertiary concentrate is melted to recover the valuable metal.SELECTED DRAWING: Figure 1 |
