Method of manufacturing articles of extremely pure synthetic par

Details Method of manufacturing articles of extremely pure synthetic par Method of manufacturing articles of extremely pure synthetic par

1988-02-26

1989-05-02

Stoll, Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65901, 423338, 501 4, 501 12, C03B 2320, C03C 2700, C03C 2900, C01B 3312

Patent

active

048265217

ABSTRACT:
In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed into the desired article, the improvement which comprises employing a ratio of silicon tetrachloride to water so that the hydrolysis product is in the form of a gel, distilling by-product hydrochloric acid out of the gel, preliminarily drying the gel at 100.degree. to 1000.degree. C. to produce an initial product, milling the initial product into a fine granulate at room temperature, separating from the milled granulate a fraction with a particle size of about 40 to 1000 .mu.m, and drying the screened-out granulate fraction while slowly heating to no more than 1400.degree. C. to form the resulting dried particulate product that is further processed into the desired article. As a result, high quality bubble free articles are produced.

REFERENCES:
patent: 3959174 (1976-05-01), Winyall et al.
patent: 4228260 (1980-10-01), Scholten et al.
patent: 4228261 (1980-10-01), Scholten et al.
patent: 4278632 (1981-07-01), Yoldas
patent: 4368846 (1983-01-01), Rau et al.
patent: 4572729 (1986-02-01), Lang et al.
Abstract of Japanese Patent '797, 4/27/76.

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