Process for the preparation of very low content of crystalobalite diatomite-based filtration agents by agglomeration with silicate or silicon binders and corresponding filtration agents

摘要

Unique pink/salmon diatomite agglomerates, well suited as filtering agents/aids, have a cristobalite content of less than 1.5%, a permeability ranging from 20 to 500 millidarcys, a cake density of less than 0.400 g/cm3, and are prepared by homogeneously intimately admixing a diatomite with a binder solution of silicic acid or of an alkali metal silicate, drying and optionally gently grinding the agglomerates thus formed, and then calcining the agglomerates at a temperature no greater than 850 DEG C., preferably no greater than 600 DEG C.