METHOD OF PRODUCTION OF LITHIUM CHLORIDE Russian patent published in 2007 - IPC C01D15/04 C01D3/14 

FIELD: production of lithium chloride.

SUBSTANCE: proposed method includes interaction of lithium carbonate in form of aqueous suspension with chlorine in double-stage absorbers in presence of iron-nickel catalyst, cleaning from admixtures, evaporation and drying. Lithium carbonate aqueous suspension used for realization of this method has mass ratio to water of from 1:5 to 1:6.5; process is continued to content of lithium chloride in liquid phase between 180-220 g/l at transformation of solution into acid medium to pH lesser than 7 and periodic change of delivery of chlorine-air mixture from first absorption chain to second and vice versa. Cleaning from admixtures of potassium, sodium, calcium and barium is performed through contact of two liquid phases- lithium amalgam and aqueous solution of lithium chloride which interact in contact system in counter-flow; contact system consists of several columns with vinyl plastic Raschig rings packing. Lithium contained in amalgam is shifted to aqueous solution upon escaping from contact system by passing the amalgam in contact with water through amalgam decomposer, after which lithium hydroxide solution is introduced into contact system in counter-flow relative to amalgam where it is mixed with flow of aqueous solution of lithium chloride introduced into contact system for cleaning. Aqueous solution of mixture of lithium chloride and lithium hydroxide escaping from contact system is directed to third and fourth finish chains of absorption where repeated chlorination is carried out.

EFFECT: reduction of labor input; reduction of power requirements; enhanced cleaning.

1 dwg, 3 tbl