COBALT POWDER PRODUCTION METHOD

摘要

Provided is a production method that, using an industrially inexpensive H2 gas, generates coarse-grained high-purity Co powder from a sulfuric acid cobalt amine complex solution by using minute Co powder. A production process is for generating a Co powder from a Co-containing substance, using a sulfuric acid cobalt amine complex solution, wherein the process is characterized by the following steps being carried out: a seed-crystal adding step for forming a mixed slurry by adding seed-crystal Co powder to the complex solution; a reducing step for blowing H2 gas into the mixed slurry and forming a reduced slurry which contains Co powder that precipitated on the seed crystals as a result of reducing the Co component in the slurry; a growing step for blowing H2 gas into the slurry in which the complex solution was added to the Co powder obtained by carrying out liquid-solid separation of the reduced slurry, and for forming a slurry which contains a grown Co powder in which the Co component in the slurry was precipitated on the surface of the Co powder; a recovery step which follows the reducing step and in which the Co powder is recovered by carrying out liquid-solid separation of the reduced slurry that contains the Co powder; and a recovery step which follows the growing step and in which the Co powder is recovered by carrying out liquid-solid separation of the slurry that contains the grown Co powder.