CALCINED DIATOMITE PRODUCTS WITH LOW CRISTOBALITE CONTENT

摘要

Described herein is a flux-calcined diatomite composition having a cristobalite content of less than about 5% by weight relative to the total weight of the flux-calcined composition and a whiteness of greater than about 90. Also described herein is a process for producing flux-calcined diatomite compositions including calcining a feed composition including diatomite having an iron content of at least about 0.5% by weight relative to the total weight of the feed composition in the presence of at least one flux including at least one alkali metal.