METHOD FOR PURIFYING LITHIUM AQUEOUS SOLUTION

• Main Author: YOKOTA HARUO
• Format: Patent
• Language: English; Japanese
• Published: 26.01.2023
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; 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; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

To provide a method, in removing metals other than lithium in a lithium aqueous solution by using a strongly acidic cation exchange resin in a lithium-ion form, for efficiently regenerating the strongly acidic cation exchange resin having captured the metals other than the lithium into a lithium-ion form.SOLUTION: A method for purifying a lithium aqueous solution includes: a purification step of removing metals other than lithium in a lithium aqueous solution containing lithium and metals other than the lithium, which is a treatment target solution, by using a strongly acidic cation exchange resin in a lithium-ion form; and a regeneration step of regenerating the strongly acidic cation exchange resin having captured the metals other than the lithium into a lithium-ion form, wherein a lithium aqueous solution having a lithium concentration of 0.1 to 1.5 eq/L is used as a regeneration agent in the regeneration step.SELECTED DRAWING: None 【課題】リチウム水溶液中のリチウム以外の金属を、リチウムイオン形の強酸性陽イオン交換樹脂を用いて除去するにあたり、該リチウム以外の金属を捕捉した強酸性陽イオン交換樹脂のリチウムイオン形への再生を効率良く行う方法を提供する。【解決手段】被処理液であるリチウムおよびリチウム以外の金属を含有するリチウム水溶液中の前記リチウム以外の金属を、リチウムイオン形の強酸性陽イオン交換樹脂を用いて除去する精製工程と、前記リチウム以外の金属を捕捉した前記強酸性陽イオン交換樹脂をリチウムイオン形に再生する再生工程と、を有するリチウム水溶液の精製方法であって、前記再生工程において、再生剤としてリチウム濃度が０．１～１．５ｅｑ／Ｌであるリチウム水溶液を用いることを特徴とするリチウム水溶液の精製方法。【選択図】なし