Granulated foamed glass and process for the production thereof
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United States of America Patent
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-
Jun 1, 1982
Grant Date -
N/A
app pub date -
Jun 6, 1980
filing date -
Oct 6, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An expanded glass aggregate has a granulometry of 0.2 to 3 mm and 10.sup.6 to 10.sup.7 cavities filled with gas per cm.sup.3. The diameter of the larger cavities is substantially smaller than 0.1 mm. All or a majority of the cavities are closed cells having a similar size. The expanded glass aggregate may contain in addition up to 85% of concrete, lava and/or tuff. For the preparation, the raw material is ground into a flour, mixed with a blowing organic and/or inorganic material appropriate to hot release gas, and a semi-finished aggregate is formed with a diameter of the granules of 0.1 to 1.5 mm. This aggregate is heated in a vibrating or suspended furnace during 5 to 180 seconds at a temperature of 600.degree. to 900.degree. C. The expanded glass aggregate is removed away from the furnace before a significant number of small cavities formed during the blowing gather to form larger cavities.
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