Nickel oxide micropowder and method for producing same
AssigneeSumitomo Metal Mining Co., Ltd.
InventorsNorimichi Yonesato, Tai Ito
Life of this patent
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Abstract
Nickel hydroxide obtained by neutralizing an aqueous nickel sulfate solution with an alkali is heat-treated in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles, and a sintered compact of nickel oxide particles that may be formed during the heat treatment is pulverized by preferably allowing the nickel oxide particles to collide with one another. The thus obtained nickel oxide fine powder has a sulfur content of 400 mass ppm or less, a chlorine content of 50 mass ppm or less, a sodium content of 100 mass ppm or less, and a specific surface area of 3 m2/g or more but less than 6 m2/g.
Claims12
A method for producing a nickel oxide fine powder having a sulfur content of 400 mass ppm or less, a specific area of 3 m2/g or more but less than 6 m2/g, a chlorine content of 50 mass ppm or less, and a sodium content of 100 mas ppm or less, said method comprising the steps of:
- neutralizing an aqueous nickel sulfate solution with an alkali to obtain nickel hydroxide particles under controlled conditions of a reaction liquid temperature to be 50 to 70° C. and a reaction liquid pH to be 8.3 to 9.0 such that a sulfur component is incorporated as a sulfate into a surface of or an interface between nickel hydroxide particles;
- heat-treating the obtained nickel hydroxide particles in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles;
- and
- pulverizing a sintered compact of nickel oxide particles that may be formed during the heat treatment.
Dependencies are inferred from the claim text.