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2 041 173

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IPC

(21) (22)

Application

4238664/33, 1987-05-04

(22)

Actual filing date

1987-05-04

(45)

Published

1995-08-09

(72)

Inventor

Boganov A.G.Rudenko V.S.Bogdanova M.S.Popov S.A.Vil'Tsen E.G.

(73)

Holder

Orlova Galina FedorovnaRudenko Viktorija StanislavovnaBogdanova Margarita SemenovnaPopov Sergej Artem'EvichVil'Tsen Elena Genrikhovna

METHOD FOR PRODUCTION OF POWDERED CRISTOBALITE Russian patent published in 1995 - IPC

Abstract RU 2041173 C1

FIELD: civil engineering. SUBSTANCE: method involves treating amorphous silicon dioxide with alkaline crystallization catalyst followed by heat treatment, first up to 1000-1050 C for 6-10 h in oxygen atmosphere, then up to 1180-1220 C, then heating to 1330-1370 C for 7-9 h with alternating blowing with oxygen an hydrogen chloride. Crystallization degree of the product, 100% EFFECT: higher cleanness of raw material. 1 tbl

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RU 2 041 173 C1

Authors

Boganov A.G.

Rudenko V.S.

Bogdanova M.S.

Popov S.A.

Vil'Tsen E.G.

Dates

1995-08-09—Published

1987-05-04—Filed