METHOD OF OBTAINING LITHIUM CONCENTRATE FROM LITHIUM-BEARING NATURAL BRINES AND ITS PROCESSING Russian patent published in 2014 - IPC C01D15/04 

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry. Lithium-bearing natural brines undergo enrichment on sorption-desorption module with obtaining primary lithium concentrate. To obtain secondary lithium concentrate primary lithium concentrate is concentrated by natural way, after which solution undergoes reagent purification and purification on polyampholyte; or lithium concentrate first undergoes ion-exchange purification, purified lithium chloride solution is subjected to reverse osmosis concentration, intermediate lithium concentrate undergoes evaporation and reagent purification; or concentrate undergoes purification from magnesium and calcium admixtures in contact with lithium carbonate, purified lithium chloride solution is concentrated first in reverse osmosis way with obtaining intermediate lithium concentrate, after that, intermediate lithium concentrate is evaporated to desalt NaCl and subjected to reagent purification; lithium concentrate undergoes ion-exchange purification from magnesium and calcium admixtures, purified solution of lithium and sodium chlorides undergoes reverse osmosis concentration, intermediate concentrate undergoes thermal desalting of NaCl; obtained lithium chloride solution is diluted and subjected to reagent purification. Obtained secondary lithium concentrate is used to obtain lithium carbonate or chloride, or fluoride, or lithium bromide, or lithium hydroxide monohydrate.

EFFECT: invention makes it possible to process lithium-bearing concentrate in complex way.

5 cl, 4 dwg, 2 tbl, 17 ex