METHOD FOR OBTAINING GRANULAR SORBENT FOR EXTRACTION OF LITHIUM FROM LITHIUM-CONTAINING BRINES Russian patent published in 2023 - IPC B01J20/30 C01D15/02 C01D15/04 C01F7/02 C01F7/56 B01J20/02 B01J2/00 

FIELD: inorganic and hetero-organic sorbents.

SUBSTANCE: method for producing granular sorbent for extracting lithium from lithium-containing brines includes obtaining a chlorine-containing version of double hydroxide of aluminum and lithium (DHAL-Cl) from a solution of aluminum chloride with an AlCl₃ concentration level of 45-220 kg/m³ containing lithium, at an atomic ratio of Al:Li =2.0-2.3:1 with the addition of sodium hydroxide, according to the invention, the pH of the mixed solution is 4-5, the resulting DHAL-Cl is mixed with an aqueous solution of polyvinyl alcohol, taken in an amount of 10-15% (in terms of polyvinyl alcohol) from mass of LiCl⋅2Al(OH)₃, stirred at a temperature of 60-80°C until a homogeneous mass is obtained, dried to a paste-like state and extruded, the extrudate is rolled, giving a rounded shape to the granules, the granules are heat treated at 105-120°C for 12-24 hours.

EFFECT: development of a technological method for producing granular sorbent for extracting lithium from lithium-containing brines.

3 cl, 2 ex