Method of manufacturing granulated silica powder, method of manufacturing vitreous silica crucible
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United States of America Patent
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Mar 15, 2016
Grant Date -
Jun 7, 2012
app pub date -
Nov 30, 2011
filing date -
Dec 1, 2010
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Abstract
The present invention provides a method of manufacturing a vitreous silica crucible having a transparent layer by use of waste vitreous silica, and silica powder suitable for the manufacturing. According to the present invention, there is provided a method of manufacturing granulated silica powder comprising a process for pulverizing waste vitreous silica generated in the manufacturing process of a crucible to form silica fine powder having an average particle diameter of 100 μm or less, and a process for granulating the silica fine powder to obtain granulated silica powder having an average particle diameter of 50 μm or more under helium atmosphere.
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