| 摘要 |
PROBLEM TO BE SOLVED: To readily produce a spherical silica powder having a large average particle diameter while enhancing the sphericity. SOLUTION: This method for producing spherical silica powder by jetting a raw material for the silica powder into a flame comprises mixing the raw material for the silica powder having a particle distribution of 20-80μm average particle diameter d50, >=10μm 10%-accumulated particle diameter d10 and <=5 ratio of d90/d10 (d90 is the 90%-accumulated particle diameter), with a carrier gas, and jetting the mixed materials at 5-40 m/s gas flow rate. Especially, the raw material for the silica powder is jetted between the inner flame and the outer flame.
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