Device for doping silica powder

Details Device for doping silica powder Device for doping silica powder

1997-05-20

1999-12-28

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

422197, 422198, 422199, 422209, 4222501, 65144, 65157, B01J 800, C03B 1906

Patent

active

060077867

ABSTRACT:
A device for doping silica powder with a dopant includes an arrangement for receiving silica soot particles or previously fabricated silica granules. The particles or granules contained in the receiving arrangement are heated to a temperature sufficient to allow agglomeration of the soot particles into granules followed by densification of the granules. The receiving arrangement is fed with a precursor gas of the dopant so that the granules are heated in an atmosphere containing the precursor gas, which causes the dopant to be incorporated into the granules during their densification to produce densified and doped silica grains. The receiving arrangement is mobile so that, during their movement, each of the granules that it contains is subject to movement such that substantially all of its outside surface is exposed to the atmosphere containing the precursor gas.

REFERENCES:
patent: 5131936 (1992-07-01), Cognolato et al.
Database WPI, Week 8737, Derwent Publications Ltd., London, GB, corresponding to JP 62 182 127 A (Nippon Teleg & Teleph) dated Aug. 10, 1987.

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