公开(公告)号：US20240375971A1

公开(公告)日：2024-11-14

申请号：US18691381

申请日：2022-09-26

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Masatoshi TAKANO ,  Satoshi ASANO ,  Shin-ichi HEGURI ,  Osamu IKEDA ,  Shin-ya MATSUMOTO ,  Yohei KUDO ,  Akihiro MURAKAMI ,  Yusuke SENBA ,  Kyohei MAEDA

IPC: C01D15/02

Abstract: To provide a method for producing lithium hydroxide allowing increasing a purity of an obtained lithium hydroxide. The method for producing lithium hydroxide includes a lithium adsorption step, a lithium elution step, an impurity removal step, and a conversion step. The impurity removal step includes: (3A) a carbonating step of a step of adding a carbonic acid source to a second lithium containing solution to obtain rough lithium carbonate; (3B) a hydrocarbonating step of a step of blowing carbon dioxide to a slurry containing rough lithium carbonate to obtain a lithium hydrogen carbonate solution; (3C) a decarbonation step of a step of heating the lithium hydrogen carbonate solution to obtain purified lithium carbonate; and (3D) an acid solution dissolution step of a step of dissolving the purified lithium carbonate in an acid solution to obtain a third lithium containing solution. Since this aspect allows reliably removing a metal other than lithium, the purity of the obtained lithium hydroxide is allowed to be increased.

公开(公告)号：US20230174385A1

公开(公告)日：2023-06-08

申请号：US17923111

申请日：2022-03-30

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Osamu IKEDA ,  Masatoshi TAKANO ,  Satoshi ASANO ,  Shin-ichi HEGURI ,  Shin-ya MATSUMOTO ,  Yohei KUDO ,  Yusuke SENBA ,  Kyohei MAEDA

IPC: C01D15/04 ,  B01J39/02 ,  B01J39/10 ,  B01J49/53

CPC classification number: C01D15/04 ,  B01J39/02 ,  B01J39/10 ,  B01J49/53

Abstract: Provided is a method for producing a lithium-containing solution that allows increasing a content rate of lithium in a solution after an eluting step, and suppressing an amount of an eluted solution used in a process after the eluting step, thus suppressing production cost of lithium.
A method for producing a lithium-containing solution includes an adsorption step of bringing a lithium adsorbent obtained from lithium manganese oxide in contact with a low lithium-containing solution to obtain post-adsorption lithium manganese oxide, an eluting step of bringing the post-adsorption lithium manganese oxide in contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step of oxidating manganese to obtain a lithium-containing solution with a suppressed manganese concentration. The adsorption step, the eluting step, and the manganese oxidation step are performed in this order, and the acid-containing solution includes the eluted solution with acid added. The method allows the usage amount of the acid in the eluting step to be suppressed, the content rate of lithium in the eluted solution after the eluting step to be increased, and thus the production cost of the lithium-containing solution to be suppressed.

公开(公告)号：US20220024776A1

公开(公告)日：2022-01-27

申请号：US17297227

申请日：2019-12-06

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Masatoshi TAKANO ,  Satoshi ASANO ,  Osamu IKEDA ,  Shin-ya MATSUMOTO ,  Yohei KUDO

IPC: C01D15/04 ,  B01D15/42 ,  B01D15/36 ,  C01G45/02 ,  B01J20/06 ,  B01J20/34 ,  C22B26/12

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.

公开(公告)号：US20230079295A1

公开(公告)日：2023-03-16

申请号：US17797397

申请日：2021-01-08

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Shin-ya MATSUMOTO ,  Masatoshi TAKANO ,  Shin-ichi HEGURI ,  Satoshi ASANO ,  Osamu IKEDA ,  Yohei KUDO

IPC: C01D15/02 ,  C01D15/04 ,  B01J39/05 ,  B01J39/18 ,  B01J47/02 ,  B01D61/44 ,  B01D15/36

Abstract: A method for producing lithium hydroxide that allows reducing a load of removing divalent or more ions with an ion-exchange resin is provided. The method for producing lithium hydroxide includes steps (1) to (3) below. (1) a neutralization step: a step of adding an alkali to a first lithium chloride containing liquid to obtain a post-neutralization liquid, (2) an ion-exchange step: a step of bringing the post-neutralization liquid into contact with an ion-exchange resin to obtain a second lithium chloride containing liquid, and (3) a conversion step: a step of electrodialyzing the second lithium chloride containing liquid to obtain a lithium hydroxide containing liquid. Since this producing method allows roughly removing divalent or more ions in the neutralization step, a load of metal removal with the ion-exchange resin is reducible.