Process for producing fine-crystalline .alpha.-quartz

Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass

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65 211, 156623Q, 156DIG64, B01J 1704, C01B 3312

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active

045294305

ABSTRACT:
The present invention relates to a process for producing a fine-crystalline .alpha.-quartz with a crystal size of from 0.08 to 0.8 mm.
The process comprises crystallization of amorphous silica in the atmosphere of water vapors in the presence of a crystallization promotor--a surface-active nitrogen-containing substance possessing basic properties in an amount of from 1.times.10.sup.-3 to 1% by weight of amorphous silica at a temperature within the range of from 300.degree. to 500.degree. C. under a pressure of from 20 to 400 atm for 6 to 100 hours.
The process of the present invention is simple as regards its technology and equipment. The resulting product is noted for a low content of impurities and is fit for the manufacture of high-quality quartz glass and quartz ceramics.

REFERENCES:
patent: 2680677 (1954-06-01), Broge et al.
patent: 3356463 (1967-12-01), Ballman et al.
patent: 3936276 (1976-02-01), Balitsky et al.
Synthetic Analogs & Imitations of Naturally-Occurring Precious Stones, Moscow, Nedra Publishers 1981 by U.S. Balitsky, E. E. Lisitsyna.
Methods of Crystal Growing, K. T. Wilke, Nedra Publishers, Leningrad Division, Leningrad 1968.
Polyethylenimine, P. A. Gembitsky, D. S. Zhuk, U. A. Kargin, "Nauka" Publishers, Moscow 1971, Chapter 1, "Methods for Producing Polyethylenimine.
Chemistry of Ethylenimine, Nauka Publishers, Moscow, 1966, USSR Academy of Sciences, P. A. Gembitsky, D. S. Zhuk, U. A. Kargin.

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