METHOD OF LITHIUM CHLORIDE PURIFICATION Russian patent published in 2008 - IPC C01D15/04 

FIELD: chemistry.

SUBSTANCE: method of lithium chloride purification from admixtures involves obtaining processing medium of lithium chloride with lithium oxychloride residues by dissolution of processing lithium hydroxide in water or by preparation of processing lithium carbonate slurry, followed by chlorination of lithium hydroxide solution or lithium carbonate slurry by waste chlorine air mix of electrolytic cells in the presence of a catalyst used for lithium oxychloride reduction. pH of the obtained lithium chloride solution is corrected before continuous sorption purification with lithium hydroxide solution or lithium carbonate till hydroxyl ion (OH^-) content is within 0.0002-0.005 mol/dm³. Lithium chloride solution undergoes sorption purification with cation exchange resin based on cross-linked macroporous polystyrol featuring subacid iminodiacetate groups inserted into the polymer matrix of subacid iminodiacetate groups with linear throughput rate of 3-20 m/h. The method improves purity degree of the processing lithium chloride solution and prolongs performance lifetime of cation exchange resin.

EFFECT: purified lithium chloride solution allows obtaining high-quality metal lithium.

2 ex, 1 tbl, 3 dwg