Process for producing unsintered cristobalite silica

Details Process for producing unsintered cristobalite silica Process for producing unsintered cristobalite silica

1988-03-17

1989-08-01

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C01B 312

Patent

active

048531987

ABSTRACT:
There is disclosed a process for producing unsintered cristobalite silica by heating an amorphous silica in the presence of an alkali component, which comprises heating an amorphous silica having a specific surface area (measured according to BET method) of 50 m.sup.2 /g or more at a temperature in the range of 1000.degree. to 1300.degree. C., in the presence of an alkali metal element in a concentration of 5 to 600 ppm to said silica to change it partially or completely into cristobalite and then heating at a temperature of exceeding 1300.degree. C. to eliminate alkali.

REFERENCES:
patent: 4395388 (1983-07-01), Kaduk
patent: 4683128 (1987-07-01), Orii et al.
patent: 4738838 (1988-04-01), Shinpo et al.

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