Hollow spheres produced from natural zeolites
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United States of America Patent
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May 15, 1984
Grant Date -
N/A
app pub date -
Mar 22, 1982
filing date -
Mar 22, 1982
priority date (Note) -
Expired
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Abstract
A process is described for the formation of hollow glassy generally spherical particles ('microspheres') from natural mineral zeolites. A zeolite (or a mixture of zeolites) is rapidly heated to a temperature above its liquidus temperature to melt its surfaces, vaporize its combined water and cause it to expand to form the microspheres. The microspheres have diameters in the range of 1 to 500 millimeters and densities of about 0.1 to 2.0 g/cm.sup.3. They are useful as fillers and extenders in many materials such as plastics, and, because of their resistance to alkaline attack, are especially useful as fillers in cementitious materials.
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