Expanded mineral particles and apparatus and method of production
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United States of America Patent
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Mar 26, 1991
Grant Date -
N/A
app pub date -
Aug 1, 1988
filing date -
Aug 1, 1988
priority date (Note) -
Expired
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Abstract
A non-porous, substantially hollow, expanded mineral product, such as expanded perlite, is produced by uniformly and indirectly heating ore for about 1 to 30 seconds in an expansion chamber maintained at about 1400.degree. F.-2100.degree. F. to produce uncoated particles which exhibit superior short term and long term density stability characterics in liquid systems, and which may subsequently be coated to provide enhanced density stability characteristics.
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