METHOD FOR RECOVERING LITHIUM FROM LITHIUM PRECIPITATION MOTHER LIQUOR

• Main Authors: YAN, Hudao, LI, Suidang, FAN, Lili, WEI, Yuyun, LYU, Weiqiang, YU, Jia, LIU, Qiong, GUO, Fumin, GAO, Junlin, KOU, Xiaokang
• Format: Patent
• Language: English; French; German
• Published: 17.04.2024
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; SEPARATION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method for recovering lithium from a mother liquor after lithium carbonate precipitation reaction, the method using the following cycle steps including adsorption, displacement, desorption and transformation: a. adding a lithium-sodium separation resin into resin columns, and feeding the mother liquor after lithium carbonate precipitation reaction to the resin columns for adsorption, wherein the adsorption rate can reach 90% or more; b. after adsorption, washing the resin with water, displacing the sodium ion with a lithium ion by lithium solution to wash out residual sodium from the resin; c. after displacement, desorbing the resin by means of an acid solution to obtain a qualified desorption solution with a high lithium and low sodium content; and d. after desorption, carrying out reverse transformation in the resin by means of a transformation solution in order to ensure that no bubbles appear and then maintain the adsorption effect during the adsorption process. During the cycle, the lithium in the mother liquor after lithium carbonate precipitation reaction was separated from the solution with a high sodium-to-lithium ratio to obtain the solution with the high lithium-to-sodium ratio.