Opaline flux-calcined diatomite products
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United States of America Patent
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Feb 8, 2022
Grant Date -
Feb 21, 2019
app pub date -
Jun 16, 2016
filing date -
Oct 23, 2015
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Abstract
A diatomite product and method of using such is disclosed. The diatomite product may comprise sodium flux-calcined diatomite, wherein the diatomite product has a crystalline silica content of less than about 1 wt %, and the diatomite product has a permeability between 0.8 darcy and about 30 darcy. In some embodiments, the diatomite product may be in particulate or powdered form. This disclosure also concerns flux-calcined silica products containing low or non-detectable levels of crystalline silica. Some of these products can be further characterized by high permeabilities and a measurable content of opal-C, a hydrated form of silicon dioxide.
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