| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily and inexpensively producing a zinc oxide fine powder having <=0.1μm, preferably <=0.05μm average particle diameter without the need for any heating. SOLUTION: A coating film consisting of a black zinc oxide fine particle is formed on the surface of metallic zinc by anodization, then a coating film consisting of a white zinc oxide fine particle is formed by anodization on the surface of the metallic zinc below the coating film consisting of the black zinc oxide fine particle to release the black zinc oxide fine particle in the form of micropieces, and the micropieces are recovered and crushed. Otherwise, metallic zinc is anodized at >=10 V electrolyzing voltage in an electrolyte contg. 0.05-0.4 M alkali metal hydroxide and 0.05-0.4 M nitrate to form a suspension of a zinc oxide fine particle, and the zinc oxide fine particle is recovered from the suspension.
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