Synthetic microspheres comprising aluminosilicate and methods of making same
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United States of America Patent
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Feb 23, 2010
Grant Date -
Apr 29, 2004
app pub date -
Aug 25, 2003
filing date -
Aug 23, 2002
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Abstract
A synthetic microsphere having a low alkali metal oxide content and methods of forming the microsphere and its components are provided. The synthetic microsphere is substantially chemically inert and thus a suitable replacement for natural cenospheres, particularly in caustic environments such as cementitious mixtures. The synthetic microsphere can be made from an agglomerate precursor that includes an aluminosilicate material, such as fly ash, a blowing agent such as sugar, carbon black, and silicon carbide, and a binding agent. The synthetic microsphere is produced when the precursor is fired at a pre-determined temperature profile so as to form either solid or hollow synthetic microspheres depending on the processing conditions and/or components used.
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