METHOD OF OBTAINING CHEMICALLY DEPOSITED CHALK Russian patent published in 2010 - IPC C01F11/18 

FIELD: chemistry.

SUBSTANCE: invention can be used in production of chemically deposited chalk for the pulp and paper, food, perfume and cosmetic, medical, pharmaceutical industries etc. The method involves preparation of water containing calcium hydroxide, treatment in a carbonator with carbon dioxide or its mixture with another gas, extraction of a chalk suspension from the carbonator, its extraction from the aqueous medium and drying. The carbonator used is a flow reactor made in form of a cylindrical housing the inside of which is divided by porous partitions into two coaxial longitudinal cavities linked to each other through the porous partitions. Water containing calcium hydroxide is fed into the outer cavity under pressure and gas under pressure is fed into the inner cavity. Pressure in the cavity containing gas is higher than pressure in the cavity with water containing calcium hydroxide. The water containing calcium hydroxide used is lime water or lime milk.

EFFECT: invention increases efficiency of the process, purity and dispersion of the obtained product.

3 cl, 2 ex