Crystalline silica-free diatomaceous earth filter aids and...

Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent – Silicon containing

Reexamination Certificate

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C423S335000, C423S336000, C423S337000, C423S338000, C423S339000, C423S340000

Reexamination Certificate

active

08084392

ABSTRACT:
A method of producing a range of diatomaceous earth filter aids having selectable permeabilities and less than about 1 percent by weight total 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; and milling the calcined diatomaceous earth in an adjustable milling and classification system to produce diatomaceous earth filter aids. Systems to implement such methods and compositions produced by such methods are also described.

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Australian office action on application No. 2008275241 issued on May 25, 2011.

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