METHOD FOR MANUFACTURING NICKEL AND COBALT MIXED SULFIDE AND NICKEL OXIDE ORE HYDROMETALLURGICAL METHOD

摘要

Provided is a method for manufacturing a nickel and cobalt mixed sulfide that is capable of stabilizing nickel and cobalt concentrations in the sulfidation end solution at low levels and of limiting decreases in nickel and cobalt recovery rates without increasing cost even when processing with a sulfuric acid-acidic solution containing nickel and cobalt and a high iron concentration as the sulfidation start solution. This method for manufacturing a nickel and cobalt mixed sulfide is a method for generating a sulfidation reaction by blowing hydrogen sulfide gas into a sulfuric acid-acidic solution comprising nickel and cobalt to obtain a mixed sulfide, wherein: the sulfuric acid-acidic solution, which is the sulfidation start solution, contains iron at a rate of 1.0-4.0 g/L; and the sulfidation reaction is generated by blowing hydrogen sulfide gas into the sulfidation start solution and adding sodium hydrogensulfide (NaHS) obtained by absorbing hydrogen sulfide gas-containing exhaust gas, generated by the sulfidation, in an alkaline solution.