METHOD OF PRODUCING MAGNESIUM CHLORIDE AND CALCIUM NITRATE IN CLOSED CYCLE Russian patent published in 2010 - IPC C01F5/34 C01F11/36 

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry and can be used in production of mineral salts. An aqueous solution of a mixture of calcium chloride and magnesium nitrate and/or its crystalline hydrate is heated until complete dissolution of the solid phase, where concentration of calcium chloride and magnesium nitrate is 60 wt % and mass ratio of calcium chloride and magnesium nitrate is 37.0:63.0 respectively. The prepared mixture is cooled to extract the crystalline hydrate of magnesium chloride which is separated from the mother solution through filtration. Calcium chloride is added to the remaining mother solution. The obtained mother solution is heated and then cooled to extract the crystalline hydrate of calcium nitrate and the remaining mother solution is returned to the beginning of the initial cycle. Magnesium chloride and calcium nitrate are crystallised at 0-25°C. A seeding agent in form of calcium nitrate crystals is added in order to extract the crystalline hydrate of calcium nitrate.

EFFECT: invention enables to obtain several products in a single cycle.

3 cl, 1 dwg, 2 ex