PRODUCTION OF CALCIUM CARBONATE WITH SURFACE SUBJECTED TO REACTIVE PROCESSING AND IT APPLICATION Russian patent published in 2014 - IPC C09C1/02 C09C3/08 C01F11/18 C08K3/26 C09C3/06 D21H17/67 

FIELD: process engineering.

SUBSTANCE: this invention can be used for production of paper, plastics and dyes. Proposed method comprises provision of calcium carbonate, provision of acid in amount of 5-50 wt % per calcium carbonate mass with pK_a smaller than or equal to 2.5; provision of gaseous CO₂, provision of at least one water-soluble non-polymer organic and/or inorganic weak acid and/or acid salt of said at least one water-soluble non-polymer organic and/or inorganic weak acid. Then, calcium carbonate is brought in contact with at least acid with pK_a smaller than or equal to 2.5; provision of gaseous CO₂, provision of at least one water-soluble non-polymer organic and/or inorganic weak acid and/or acid salt of said at least one water-soluble non-polymer organic and/or inorganic weak acid. Note here said water-soluble non-polymer organic and/or inorganic weak acid features pK_a larger than 2.5 while anion of appropriate acid can form water-insoluble calcium salts.

EFFECT: controlled particle size, higher specific surface and yield.

23 cl, 7 tbl, 7 ex