Method for producing lithium-containing solution

Patent metadata

Field	Value
Publication number	US-2022024776-A1
Application number	US-201917297227-A
Country	US
Kind code	A1
Filing date	Dec 6, 2019
Priority date	Dec 7, 2018
Publication date	Jan 27, 2022
Grant date	—

Abstract

Provided is a method for producing a lithium-containing solution that prevents the dissolution of the whole lithium manganese oxide while maintaining the efficiency of an elution step. The method for producing a lithium-containing solution comprises performing an adsorption step of contacting a lithium adsorbent obtained from lithium manganese oxide with a low lithium-containing liquid for adsorption to give post-adsorption lithium manganese oxide, an elution step of contacting the post-adsorption lithium manganese oxide with an acid solution to give a lithium-containing solution with residual manganese, and a manganese oxidation step of oxidating manganese to give a lithium-containing solution with a suppressed manganese concentration, performed in this order. The acid solution is a 0.5 mol/L or more and 4.0 mol/L or less hydrochloric acid solution. According to the production method, in the elution step, the dissolution of the whole lithium manganese oxide can be suppressed while maintaining the efficiency of exchange reaction between cations including Li+ and H+. Thus, the repeated use of the lithium adsorbent becomes possible.

First claim

1 : A method for producing a lithium-containing solution, comprising:
an adsorption step of contacting a lithium adsorbent obtained from lithium manganese oxide with a low lithium-containing liquid for adsorption to give post-adsorption lithium manganese oxide; an elution step of contacting the post-adsorption lithium manganese oxide with an acid solution to give a lithium-containing solution with residual manganese; and a manganese oxidation step of oxidating manganese by adding an oxidant and a pH adjuster to the lithium-containing solution with residual manganese to give a lithium-containing solution with a suppressed manganese concentration, performed in this order, wherein the acid solution is a 0.5 mol/L or more and 4.0 mol/L or less hydrochloric acid solution, and, in the manganese oxidation step, a pH is set to be in a range of 3 or more and 7 or less, and a redox potential vs the silver-silver chloride electrodes is set to 600 mV or more and 1100 mV or less.

2 : The method for producing a lithium-containing solution according to claim 1 , wherein the elution step is performed at 0° C. or higher and 70° C. or lower.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Takano Masatoshi
• Asano Satoshi
• Ikeda Osamu
• Matsumoto Shin-Ya
• Kudo Yohei

Classifications

• C01G45/01

  Preparation or separation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title

• B01J49/06

  containing cationic exchangers · CPC title

• B01J49/53

  for cationic exchangers · CPC title

• B01J39/10

  Oxides or hydroxides · CPC title