Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1991-12-02
1994-05-17
Hastings, Karen M.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 71, 65302, 65335, 65DIG8, 373 20, 373 27, 373 63, C03B 1904, C03B 2000
Patent
active
053124715
ABSTRACT:
The disclosed process involves the feeding of particulate SiO.sub.2 into a rotating cylindrical furnace in which a gas plasma arc has been established, for melting the feed at a temperature of at least 2400.degree. C. The feed rate is regulated so that the rate of growth of the radius of the ingot melt will not exceed the rate at which bubbles move through the melt to the inner cylindrical surface. The preferred apparatus is a rotating horizontal furnace having a pair of opposing hollow electrodes mounted in its opposing end surfaces for establishment of an arc therebetween. A feeding device introduces the SiO.sub.2 feed through the open bore of one of the electrodes for melting by the plasma arc.
REFERENCES:
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patent: 2106022 (1938-01-01), Seil
patent: 3652245 (1972-03-01), Jung
patent: 3674904 (1972-07-01), Jung
patent: 3821455 (1974-06-01), Greenewald
patent: 4122293 (1978-10-01), Grigorenko et al.
patent: 4188201 (1980-02-01), Jung
patent: 4935046 (1990-06-01), Uchikawa et al.
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