Method for the preparation of vitrified silica particles
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United States of America Patent
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Oct 2, 2001
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N/A
app pub date -
Dec 30, 1994
filing date -
Dec 30, 1994
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Expired
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Abstract
An efficient method is proposed for the utilization of heretofore useless extremely fine fluffy silica particles obtained as a flue dust in the flame-hydrolysis of vaporizable silicon compound in an oxyhydrogen flame in the manufacturing process of fused silica glass. The method comprises the steps of (a) uniformly mixing the silica particles with water, (b) drying the wet mixture under specified conditions to give dried cakes of the silica particles, (c) disintegrating the dried cakes into porous silica beads having an appropriate particle diameter, (d) semi-sintering the porous silica beads at 800 to 1300.degree. C. and (e) vitrifying the semi-sintered silica beads at 1350 to 1550.degree. C. into vitrified poreless silica glass particles which can be used as a base material for the production of fused silica glass articles.
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