METHOD OF OBTAINING CALCIUM CARBONATE WITH SURFACE SUBJECTED TO REACTION PROCESSING, WITH APPLICATION OF WEAK ACID, FINAL PRODUCTS AND THEIR APPLICATION Russian patent published in 2014 - IPC C09C1/02 C01F11/18 C09C3/06 C09C3/08 C08K3/26 D21H17/67 

FIELD: chemistry.

SUBSTANCE: invention can be used in production of paper, paints and plastics. A method of obtaining calcium carbonate with a surface subjected to reaction processing in water medium includes a) supply of at least one type of ground natural calcium carbonate (GNCC); b) supply of at least one water-soluble acid; c) supply of gaseous CO₂; d) contact of the said GNCC with the said acid and CO₂. The said acid of stage b) has pK_a higher than 2.5 and lower or equal to 7, measured at 20°C, connected with ionisation of the first available hydrogen, and respective anion, formed with a loss of the said first available hydrogen, capable of forming water-soluble calcium salts. After the contact of the said acid with GNCC supplied is at least one water-soluble salt, which has pK_a higher than 7, measured at 20°C, connected with ionisation of the first available hydrogen. The salt anion is capable of forming water-insoluble calcium salts, with cation of the said water-soluble salt being selected from the group, consisting of potassium, sodium, lithium and their mixtures. The anion of the said water-soluble salt is selected from the group, consisting of phosphate, dihydrophosphate, monohydrophosphate, oxalate, silicate, their mixtures and hydrates.

EFFECT: invention makes it possible to increase specific surface of calcium carbonate surface without application of moderately strong and strong acids.

28 cl, 1 tbl, 7 ex