Highly purified biogenic silica product
AssigneeAdvanced Minerals Corporation
InventorsJerome C. Shiuh, Scott K. Palm, Timothy R. Smith, George A. Nyamekye, Jeffrey D. Taniguchi, Qun Wang
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Abstract
This invention relates to highly purified biogenic silica product obtained from diatomite and methods for preparing same. More particularly, this invention pertains to highly purified non-calcined, calcined, and flux-calcined diatomite products which bear the distinguishing porous and intricate structure of silica unique to diatomite and which have an extraordinarily high silica (i.e., silicon dioxide, SiO.sub.2) content and low density, resulting in high silica specific volume. These products often also exhibit exceptionally low soluble metals content and/or extreme brightness.
Claims24
A highly purified non-calcined diatomite product having an intricate and porous diatomaceous silica structure, said product having a silica specific volume greater than 3.5.
A highly purified calcined diatomite product having an intricate and porus diatomaceous silica structure, said product having a silica specific volume greater than 3.6, said product having a total silica content of greater than 98% (w/w) SiO.sub.2 on an ignited basis.
A highly purified flux calcined diatomite product having an intricate and porous diatomaceous silica structure, said product having a silica specific volume greater than 3.3.
A highly purified diatomite product having an intricate and porous diatomaceous silica structure, said product having a blue light reflected brightness greater than 99%.
Dependencies are inferred from the claim text.