Patent ID: 7063826
Filing Date: 2006-06-20
Classification: C03B,C03C

Abstract:
1. A process for producing a synthetic quartz powder which comprises hydrolyzing an alkoxysilane to obtain a silica gel having an average particle diameter of from 10 to 500 μm and bringing said silica gel into contact with at least one of helium and hydrogen gas at a temperature of from 400° C. to 1,300° C., wherein before or after said bringing said silica gel into contact with at least one of helium and hydrogen gas, said silica gel is heat-treated at a temperature of 1,000° C. or higher for from 10 to 50 hours in an oxygen-containing atmosphere, and wherein said synthetic quartz powder, upon heating from room temperature to 1,700° C., generates gases in which the amount of CO is 300 nl/g or smaller and the amount of CO