METHOD OF PRODUCTION OF THE CHEMICALLY DEPOSITED CHALK Russian patent published in 2007 - IPC C01F11/18 

FIELD: chemical industry; other industries; methods of production of the chemically deposited chalk.

SUBSTANCE: the invention is pertaining to the method of production of the chemically deposited chalk may be used in the productions having the wastes in the form of the calcium-containing solutions. The method of production of chemically deposited chalk provides for the alkaline solution carbonization, sedimentation, separation, washing, drying, grinding. In the capacity of the alkaline solution use the caustic liquors produced at the process of production of the chlorine and the caustic soda by the diaphragm electrolysis, and preliminary purified from iron and sulfate-ions. Sedimentation is conducted using the calcium chloride solution - the waste of production of the dibasic salt of calcium hypochlorite preliminary purified from the iron up to reaching рН equal to 10.3. The invention allows to use as the source feedstock the calcium chloride solution - the waste of production of the dibasic salt of the calcium hypochlorite and also the caustic liquors of the chlorine production process and the caustic soda by the diaphragm electrolysis of sodium chloride, that, in turn, will allow to regulate the amount of worked out caustic soda at the constant productivity of chlorine and to reduce the power input used for evaporation of the commercial caustic soda from the caustic liquors.

EFFECT: the invention allows to use calcium chloride solution and the caustic soda to produce the chemically deposited chalk, to regulate the amount of worked out caustic soda at the constant productivity of chlorine, to reduce the power input used for evaporation of the commercial caustic soda from the caustic liquors.

3 cl, 1 tbl, 1 ex