Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2011-05-03
2011-05-03
Lorengo, J. A. (Department: 1731)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C423S340000, C204S155000, C204S158200, C209S038000, C209S039000, C209S040000
Reexamination Certificate
active
07935326
ABSTRACT:
To provide a treatment method having excellent purification effect, in which impurities having high ionicity in a silica powder can be removed in a short time, a apparatus thereof, and a purified silica powder.A purification method of a silica powder comprises: making a silica powder into a fluid state; contacting a purified gas to the silica powder in the fluid state at high temperature; and thereby removing impurity components of the silica powder. In the method, the silica powder in the fluid state is positioned in a magnetic field region. Further, the silica powder is contacted with the purified gas, while applying voltage to the silica powder by an electric field generated by moving of the silica powder. Preferably, the silica powder in a fluid state is positioned in the magnetic region of 10 gausses or more, and contacted with the purification gas at a temperature of 1000° C. or more.
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Kanda Minoru
Tsuji Yoshiyuki
Darji Pritesh
Japan Super Quartz Corporation
Lorengo J. A.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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