Method for producing highly pure lithium salts

Details Method for producing highly pure lithium salts Method for producing highly pure lithium salts

C - Chemistry, Metallurgy

01

D

C01D 15/08 (2006.01) B01J 39/04 (2006.01) C01D 15/04 (2006.01)

Patent

CA 2322544

The invention relates to a method for producing a highly pure lithium salt using lithium carbonate. Said method comprises the following steps: A: treating a mixture comprising lithium carbonate and water with CO2 to produce an aqueous mixture containing lithium hydrogencarbonate; B: passing the aqueous mixture containing lithium hydrogencarbonate through an ion-exchange module; C: precipitating out the lithium carbonate from the aqueous mixture containing lithium hydrogencarbonate obtained in step B after treatment with the ion-exchange module and D: reprocessing the precipitated lithium carbonate or converting the precipitated lithium carbonate into another highly pure lithium salt.

L'invention concerne un procédé de production d'un sel de lithium de grande pureté à partir de carbonate de lithium. Ce procédé consiste A) à traiter une composition de carbonate de lithium et d'eau au CO¿2? pour obtenir une composition aqueuse contenant de l'hydrocarbonate de lithium; B) à faire transiter la composition aqueuse contenant de l'hydrocarbonate de lithium par un module d'échange d'ions; C) à extraire par précipitation le carbonate de lithium de la composition contenant l'hydrocarbonate de lithium obtenue en B après traitement à l'aide du module d'échange d'ions et D) à retraiter le carbonate de lithium précipité ou transformer le carbonate de lithium précipité en un autre sel de lithium de grande pureté.

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