Method for producing silica particles

Details Method for producing silica particles Method for producing silica particles

2006-11-28

2006-11-28

Lopez, Carlos (Department: 1731)

Glass manufacturing

Processes

Sol-gel or liquid phase route utilized

C065S440000

Reexamination Certificate

active

07140201

ABSTRACT:
A hydrous silica gel is dehydrated by freezing, thawing, and removing water separated by thawing, thereby yielding silica particles. In addition, the silica particles thus formed is washed and fired, thereby producing a synthetic quartz glass power.A water glass is dealkalized, an oxidizing agent and an acid are added, the mixture thus formed is passed through a hydrogen type cation exchange resin, the aqueous silica solution thus formed is then gelled, and the gelled material is then washed and fired, thereby producing a synthetic quartz powder.Silica is sequentially held for a predetermined time at each temperature range of 150 to 400° C., 500 to 700° C., and 1,100 to 1,300° C., thereby producing a quartz glass.

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Machine Translation of JP 08-133718, retrieved on Mar. 8, 2005.

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