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    • 5. 发明专利
    • PRODUCTION OF SUPERFINE METAL OXIDE PARTICLE
    • JPH09100105A
    • 1997-04-15
    • JP25504995
    • 1995-10-02
    • MITSUBISHI CHEM CORP
    • YOSHIE KENICHI
    • C01B13/32B01J19/08C01B33/18
    • PROBLEM TO BE SOLVED: To provide a method for producing superfine metal oxide particles capable of effectively generating superfine particles in the case of using large sized particles as a raw material, and without using a difficult-to-handle raw material by introducing specific dried gel particles into a high temperature plasma-atmosphere gas. SOLUTION: The method for producing superfine metal oxide particles is to use a compound which can be converted to a gel by hydrolysis, e.g. one or more kinds of compound of Si, Zn, Ti, niobium and tin, but especially a silicon alkoxide such as tetramethoxysilane and tetraethoxysilane is easily hydrolyzed to give a gel excellent in characteristics. The gelation by hydrolysis is performed by using 1mol silicon alkoxide with 2-10mols of water at pH2-8 during the gelation, and since the gelation reaction is so rapid in the acidic region, the reaction is controlled by adding an alcohol. The reaction temperature is 20-80 deg.C and the temperature is kept at the reaction temperature for several hrs. after gelation until its completion, and gel particles having 50-500μm particle diameter and 0.5-20wt.% water content are obtained by crushing the obtained gel and sieving. The obtained particles are introduced into an electrode less-type thermal plasma at >=2000 deg.C.