METHOD FOR IMPROVING GRANULOMETRIC COMPOSITION OF PARTICLES CONTAINING A CALCIUM CARBONATE MATERIAL Russian patent published in 2018 - IPC C09C1/02 C01F11/18 C09C3/04 D21H19/38 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Aqueous suspension containing calcium carbonate is preheated to a temperature of 40 to 95 °C. and wet milling is carried out. pH of the aqueous suspension is adjusted by adding the base to a pH value of ≥ 9.0. Resulting aqueous suspension is kept at a temperature of from 70 to 140 °C from 0.25 to 8 hours. Calcium carbonate-containing material has a particle-to-particle ratio d₈₀ average particle size, to particles of importance d₂₀ average particle size, [d₈₀/d₂₀], in the range from 1.5 to 4.

EFFECT: resulting material is characterized by a narrow particle size distribution, low sensitivity to moisture absorption and a low specific surface area of BET, and is used as a filler in the production of paper and paperboard, in cosmetics, in waterproofing and sealing materials, in glue materials, in paints and coatings, in fibrous materials, in plastic materials.

24 cl, 10 tbl, 5 ex, 2 dwg