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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
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.
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公开(公告)号：US20240238760A1
公开(公告)日：2024-07-18
申请号：US18007704
申请日：2022-06-16
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Shin-ya MATSUMOTO , Yohei KUDO , Masatoshi TAKANO , Shin-ichi HEGURI , Satoshi ASANO
IPC: B01J20/30
CPC classification number: B01J20/3078 , B01J20/3014 , B01J20/3028
Abstract: Provided is a producing method of granulated body for lithium adsorption that allows sufficiently suppressing a manganese elution in an eluting step when producing lithium on a commercial basis.
A producing method of granulated body for lithium adsorption includes a kneading step of kneading a powder of a lithium adsorbent precursor and a binder to obtain a kneaded product, a granulating step of granulating the kneaded product to obtain a 1st granulated body, and a sintering step of sintering the 1st granulated body to obtain a 2nd granulated body. The configuration allows a manganese valence contained in the lithium adsorbent precursor to change from 2 to 4, and thus allowing the suppressed manganese elution in the eluting step. Further, in production on a commercial basis, the lithium adsorbent can be used repeatedly. In addition, a manganese concentration in an eluent obtained in the eluting step can be suppressed, thus allowing loads in steps after the eluting step to be reduced.-
3.发明公开公开(公告)号：US20240308864A1
公开(公告)日：2024-09-19
申请号：US18681346
申请日：2022-10-17
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Masatoshi TAKANO , Satoshi ASANO , Shin-ichi HEGURI , Yusuke SENBA
Abstract: A method for producing a lithium containing solution includes a neutralization step of obtaining an untreated lithium containing solution by adding alkali to a crude lithium containing solution and an ion-exchange step of obtaining a lithium containing solution in which a predetermined metallic element is reduced compared with an untreated lithium containing solution by using an ion-exchange resin. In the ion-exchange step, the predetermined metallic element is removed by passing the untreated lithium containing solution through a column containing the ion-exchange resin. A portion of the untreated lithium containing solution passing through the column that is a preliminarily determined amount after starting the liquid passing into the column is to be excluded from the lithium containing solution.
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公开(公告)号：US20180134577A1
公开(公告)日：2018-05-17
申请号：US15577521
申请日：2016-05-20
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Hideki OHARA , Satoshi ASANO , Toshirou TAN , Masatoshi TAKANO
CPC classification number: C01G51/08 , C22B3/46 , C22B23/0469 , C22B23/06 , H01M4/525 , Y02P10/234
Abstract: The present invention provides an aqueous cobalt chloride solution refinement method, in which impurities can be efficiently removed from a cobalt salt solution.Disclosed is a method for bringing metallic nickel into contact with an aqueous solution containing cobalt chloride to remove an impurity by a cementation reaction, in which the metallic nickel is washed with an acidic liquid having a pH of not more than 2.5 before the metallic nickel is brought into contact with the aqueous solution containing cobalt chloride. Since the metallic nickel is washed with the acidic liquid having a pH of not more than 2.5, a passive film on a surface of the metallic nickel is removed. The passive film is removed from the metallic nickel, and therefore, when the metallic nickel comes in contact with the aqueous solution containing cobalt chloride, an impurity more noble than the metallic nickel can be precipitated by the cementation reaction. In addition, since the metallic nickel is only washed with acid to be brought into contact with the aqueous solution containing cobalt chloride, the impurity can be easily removed from the aqueous solution containing cobalt chloride.
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公开(公告)号：US20240391786A1
公开(公告)日：2024-11-28
申请号：US18267054
申请日：2022-12-13
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Yusuke SENBA , Masatoshi TAKANO , Satoshi ASANO , Shin-ichi HEGURI
Abstract: To provide a method for producing lithium hydroxide allowing obtaining high purity lithium hydroxide by reducing impurities to a preliminarily determined level in a step before a conversion step by electrodialysis. The method for producing lithium hydroxide includes steps (1) to (5) below: (1) a hydrocarbonating step of blowing carbon dioxide to a slurry of a mixture of water and rough lithium carbonate; (2) a decarbonation step of heating a lithium hydrogen carbonate solution; (3) an acid solution dissolution step of dissolving a purified lithium carbonate in an acid solution; (4) an impurity removal step of removing a part of metal ions from a first lithium containing solution; and (5) a conversion step of converting lithium salt contained in a second lithium containing solution into lithium hydroxide by electrodialysis. This producing method allows reliably removing metals other than lithium, thereby allowing an increased purity of obtained lithium hydroxide.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20210039011A1
公开(公告)日：2021-02-11
申请号：US16979607
申请日：2018-11-21
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Hideki OHARA , Satoshi ASANO , Hiroshi KOBAYASHI , Masatoshi TAKANO , Shota SANJO
Abstract: Provided is a solvent extraction method that allows selectively separating magnesium from an acidic aqueous solution of sulfuric acid. The solvent extraction method includes: bringing an acidic aqueous solution of sulfuric acid containing nickel, cobalt, and magnesium in contact with an organic solvent to extract the magnesium into the organic solvent; and using the organic solvent produced by diluting an extractant made of alkylphosphonic acid ester with a diluent. A concentration of the extractant is set to 40 volume % or more and 60 volume % or less and a pH of the acidic aqueous solution of sulfuric acid is set to 1.5 or more and 2.0 or less, or the concentration of the extractant is set to 20 volume % or more and 50 volume % or less and the pH of the acidic aqueous solution of sulfuric acid is set to 2.0 or more and 2.5 or less.
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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.
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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
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：US20180148344A1
公开(公告)日：2018-05-31
申请号：US15577507
申请日：2016-05-20
Applicant: SUMITOMO METAL MINING CO., LTD.
Inventor： Toshirou TAN , Masatoshi TAKANO , Hideki OHARA , Satoshi ASANO
CPC classification number: C01G51/085 , C22B3/46 , C22B23/00 , C22B23/0469 , C22B23/06 , H01M4/525 , H01M2004/028 , Y02P10/234
Abstract: The present invention provides an aqueous cobalt chloride solution purification method, in which impurities can be efficiently removed from a cobalt salt solution.Provided is a method for bringing metallic nickel into contact with an aqueous solution containing cobalt chloride to remove an impurity by a substitution reaction, in which the pH of the aqueous solution containing cobalt chloride is adjusted to not less than 1.5 and not more than 2.5. Since the pH of the aqueous solution containing cobalt chloride is adjusted to not less than 1.5 and not more than 2.5, a passive film on a surface of the metallic nickel can be effectively removed. When the passive film is removed, the metallic nickel comes in contact with the aqueous solution containing cobalt chloride, so that an impurity more noble than the metallic nickel can be precipitated by the substitution reaction. In addition, since the metallic nickel is only brought into contact with the aqueous solution containing cobalt chloride, the impurity can be easily removed from the aqueous solution containing cobalt chloride.
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