Production of high silica glass microspheres

Details Production of high silica glass microspheres Production of high silica glass microspheres

1988-08-02

1990-02-27

Lindsay, Robert L.

Glass manufacturing

Processes

Self-supporting particle making

65 22, 65 31, C03B 1910

Patent

active

049042939

ABSTRACT:
Production of microspheres having a very high silica content produced from a starting glass whose silica content is less than 80% by weight, with the remainder being essentially made up of boron oxide and one or more alkaline oxide(s). This starting glass is reduced into fine particles by grinding, optionally mixed with a fluidizing agent, and then passed through the flame of a burner at a temperature at least equal to 1500.degree. C. to form molten hollow microspheres which are suddenly cooled to form solid hollow microspheres. The microspheres produced thereby are recovered and contacted with a dealkalization agent to increase the silica content thereof to at least 92%.

REFERENCES:
patent: 2221709 (1940-11-01), Hood et al.
patent: 3061495 (1962-10-01), Alford
patent: 4547233 (1985-10-01), Delzant
patent: 4778502 (1988-10-01), Garnier et al.

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