GRANULAR FILTER MATERIAL Russian patent published in 2017 - IPC B01D39/06 B01J20/28 

FIELD: chemistry.

SUBSTANCE: grounded diatomite particles are mixed with bonding additives and sent to the layer-by-layer granulating in the disk granulator or the fluidised bed granulator up to the spherical isotropic granules production. The resulting granules are dried and then calcined. Ready-made diatomite granules have the porous structure, formed from the spherical-shaped layers, the rough surface of which has the abrasive properties. The granules size is in the range from 0.3 to 6.0 mm. The size of the roughness protuberances on the surface of the granules is in the range from 1.0 to 150.0 mcm. The granule strength of uniaxial compression is not less than 5.0/d_g MPa, where d_g- diameter of the granule, mm. The strength of the granules is enhanced by vitrification during the calcination process. With this purpose 0.1 to 10.0% of glass forming oxides of alkali and/or alkaline-earth metals are added to the granules content.

EFFECT: finished product quality improvement.

5 cl, 1 ex