Nickel powder production method

摘要

Provided is a method for producing fine nickel powder suitable for use as a seed crystal in the production of nickel powder from a solution containing a nickel sulfate ammine complex. The production method for nickel powder is characterized by producing nickel powder by performing, in order: a mixing step in which a solution containing the nickel sulfate ammine complex has added thereto an insoluble solid that is insoluble in the solution and a dispersant including a sulfonate, and a mixed slurry is formed; a reduction/precipitation step in which after the mixed slurry is introduced into a reaction tank, hydrogen gas is blown into the mixed slurry inside the reaction tank, nickel complex ions contained in the mixed slurry are reduced, and a nickel precipitate is formed on the surface of the insoluble solid; and a separation step in which the nickel precipitate on the surface of the insoluble solid is separated from the surface of the insoluble solid and nickel powder is formed.