FIELD: chemical or physical processes.
SUBSTANCE: invention relates to filtration materials for fluids. Disclosed is a diatomaceous material subjected to calcination under flux based on sodium carbonate. Diatomite product has content of crystalline silicon dioxide less than 0.1 wt. % and has permeability within 0.8 darsi and about 30 darsi.
EFFECT: diatomite product may contain a certain amount of cristobalite which is determined using a method which distinguishes cristobalite and opal-C, particularly using LH Method.
14 cl, 33 dwg, 20 tbl
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