CRYSTALLINE SILICA-FREE DIATOMACEOUS EARTH BLENDED FILTER AIDS AND METHODS OF MANUFACTURING THE SAME
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United States of America Patent
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app pub date -
Mar 20, 2009
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Jul 6, 2007
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Abstract
A method of producing a range of diatomaceous earth blended filter aids having selectable permeabilities and less than about 1 percent by weight total of crystalline silica and less than about 0.1% by weight total of respirable crystalline silica. The method includes milling diatomaceous earth ore to a size range of between about 100 micrometers and about 1400 micrometers; calcining the milled diatomaceous earth in a calciner; milling the calcined diatomaceous earth in an adjustable milling and classification system to produce diatomaceous earth filter aids, and blending the diatomaceous earth with expanded perlite to form a low bulk density and low solubility filter aid.
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