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|1. (WO2017038589) PROCESS FOR PRODUCING NICKEL POWDER|
|Applicants:||SUMITOMO METAL MINING CO., LTD.
|Title:||PROCESS FOR PRODUCING NICKEL POWDER|
Provided is a production process by which a so-called high-purity nickel powder made up of coarse particles and reduced in the content of impurities, in particular, in sulfur content, is produced from a nickel sulfate ammine complex solution using a fine nickel powder. This process is for producing a nickel powder from a nickel sulfate solution, and is characterized by conducting the following treatment steps (1) to (4): (1) a hydroxylation step in which a sediment of nickel hydroxide is yielded; (2) a complexation step in which a mixed slurry comprising a nickel sulfate ammine complex solution, seed crystals, and the nickel hydroxide is formed; (3) a reduction step in which a reduction slurry containing a nickel powder formed by the deposition of nickel matter on the seed crystals is formed; and (4) a solid-liquid separation step in which the reduction slurry formed in the reduction step (3) is subjected to solid-liquid separation to recover the nickel powder and a reduction end liquid.