Nickel oxide fine powder and process for producing the same, nickel hydroxide powder for the nickel oxide fine powder production raw material and a process for producing the same

摘要

PROBLEM TO BE SOLVED: To provide a nickel oxide fine powder that is suitable for use as an electronic component material or an electrode material of a solid oxide type fuel battery, has a low sulfur content and a low chlorine content and has a fine particle size and to provide an industrially stable method for producing the nickel oxide fine powder.SOLUTION: The method for producing a nickel oxide fine powder comprises neutralizing an aqueous nickel sulfate solution with an alkali to produce a nickel hydroxide powder; washing the nickel hydroxide powder with an aqueous solution containing a carbonate radical; and then subjecting the nickel hydroxide powder to heat treatment in a non-reducing atmosphere at a temperature of more than 850°C to less than 980°C and crushing the powder to produce a nickel oxide fine powder. The resultant nickel oxide fine powder has a sulfur content of 50 mass ppm or less, a chlorine content of 50 mass ppm or less and a sodium content of 100 mass ppm or less, and has a D50 of 0.5 μm or less as measured by the laser scattering method.SELECTED DRAWING: None