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JP7706177B2 - Method for obtaining high purity lithium salt from low grade lithium carbonate - Google Patents

Method for obtaining high purity lithium salt from low grade lithium carbonate Download PDF

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JP7706177B2
JP7706177B2 JP2023064857A JP2023064857A JP7706177B2 JP 7706177 B2 JP7706177 B2 JP 7706177B2 JP 2023064857 A JP2023064857 A JP 2023064857A JP 2023064857 A JP2023064857 A JP 2023064857A JP 7706177 B2 JP7706177 B2 JP 7706177B2
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JP2024151486A (en
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慶太 山田
幸雄 佐久間
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Asaka Riken Co Ltd
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Description

本発明は、低品位炭酸リチウムから高純度リチウム塩を得る方法に関する。 The present invention relates to a method for obtaining high-purity lithium salt from low-grade lithium carbonate.

塩湖鹹水、鉱石、廃リチウムイオン電池等から回収される低品位炭酸リチウムから高純度リチウム塩が製造されている。特許文献１は、電気透析装置を使用し、塩室に炭酸リチウム溶液を供給して酸室から繰り返して炭酸リチウム水溶液取り出す水酸化リチウムの製造方法を開示し、更には高純度化する精製工程を付与した製造方法も開示する。 High-purity lithium salts are produced from low-grade lithium carbonate recovered from salt lake brine, ores, waste lithium-ion batteries, etc. Patent Document 1 discloses a method for producing lithium hydroxide using an electrodialysis device, in which a lithium carbonate solution is supplied to a salt chamber and an aqueous lithium carbonate solution is repeatedly extracted from an acid chamber, and further discloses a production method that includes a purification process for increasing the purity.

特許文献２は、炭酸リチウムを水酸化カルシウムと液中で反応させ、水酸化リチウム溶液を得る水酸化工程、当該水酸化工程における水酸化カルシウムの添加に起因して水酸化リチウム溶液中に存在するカルシウムイオンを、陽イオン交換樹脂及び／又はキレート樹脂に吸着して除去するカルシウム除去工程、及び晶析工程を行い、カルシウム含有量の低い高純度水酸化リチウムの製造方法を開示している。 Patent Document 2 discloses a method for producing high-purity lithium hydroxide with a low calcium content, which comprises a hydroxide step in which lithium carbonate is reacted with calcium hydroxide in a liquid to obtain a lithium hydroxide solution, a calcium removal step in which calcium ions present in the lithium hydroxide solution due to the addition of calcium hydroxide in the hydroxide step are removed by adsorption onto a cation exchange resin and/or a chelating resin, and a crystallization step.

特開２０１１－０３２１５１号公報JP 2011-032151 A 特開２０２１－１７２５３７号公報JP 2021-172537 A

特許文献１に開示された水酸化リチウムの製造方法において、炭酸リチウム溶液と炭酸水を混合して生成する炭酸水素リチウムの水に対する溶解度は数ｇ／Ｌであり、電解液量が膨大になる。さらに電気透析で得られる水酸化リチウム水溶液の濃度は高くないので、当該水溶液から水酸化リチウムの結晶を回収するためには、多大なエネルギーを費やして大量の水を蒸発させる必要がある。また、引用文献２に開示された水酸化リチウムの製造方法において、大量の炭酸カルシウムが廃棄物として発生してしまう。 In the method for producing lithium hydroxide disclosed in Patent Document 1, the solubility of lithium hydrogen carbonate produced by mixing lithium carbonate solution with carbonated water in water is several g/L, and the amount of electrolyte is enormous. Furthermore, since the concentration of the lithium hydroxide aqueous solution obtained by electrodialysis is not high, it is necessary to evaporate a large amount of water by expending a great deal of energy in order to recover lithium hydroxide crystals from the aqueous solution. Furthermore, in the method for producing lithium hydroxide disclosed in Cited Document 2, a large amount of calcium carbonate is generated as waste.

したがって、本発明が解決しようとする課題は、多大なエネルギーを費やさず、大量の廃棄物を発生させない、低品位炭酸リチウムから高純度リチウム塩を得る方法を提供することである。 Therefore, the problem that the present invention aims to solve is to provide a method for obtaining high-purity lithium salt from low-grade lithium carbonate without consuming a large amount of energy and without generating a large amount of waste.

本発明者らは上記課題に鑑み検討を重ね、低品位炭酸リチウムを鉱酸に溶解し、不純物を除去して得られるリチウム塩水溶液を膜電解すると、多大なエネルギーを費やさず、大量の廃棄物も生成させないで高純度リチウム塩を得られることを見出した。本発明はこれらの知見に基づき完成されるに至ったものである。 The inventors of the present invention have conducted extensive research in light of the above problems and have discovered that by dissolving low-grade lithium carbonate in a mineral acid, removing impurities, and then subjecting the resulting lithium salt aqueous solution to membrane electrolysis, high-purity lithium salt can be obtained without consuming a large amount of energy or generating a large amount of waste. The present invention has been completed based on these findings.

本発明は、鉱物、天然の塩湖から得られる塩水、及び海水からなる群から選ばれる少なくとも１つから低品位炭酸リチウムを得る工程、当該低品位炭酸リチウムを鉱酸に溶解する酸溶解工程、当該酸溶解工程で得られた粗リチウム塩水溶液から不純物を除去する不純物除去工程、及び、当該不純物除去工程で得られた第１のリチウム塩水溶液を膜電解し、第２のリチウム塩水溶液と高純度水酸化リチウム水溶液を生成する膜電解工程を含み、当該不純物が、当該不純物除去工程においてイオン交換樹脂により除去され、当該膜電解工程で生成する鉱酸を当該酸溶解工程で使用し、当該第２のリチウム塩水溶液中のリチウム塩濃度は、当該第１のリチウム塩水溶液中のリチウム塩濃度より小さいことを特徴とする、低品位炭酸リチウムから高純度リチウム塩を回収する方法に関する。
本発明は、好ましくは、前記酸溶解工程で発生する二酸化炭素と前記膜電解工程で生成する高純度水酸化リチウムを反応させて、高純度炭酸リチウムを得る炭酸化工程を更に含む。これにより前記酸溶解工程で生成する二酸化炭素の一部を廃棄することなく有効利用できる。
本発明は、好ましくは、前記第２のリチウム塩水溶液を濃縮し、濃縮されたリチウム塩水溶液を前記第１のリチウム塩水溶液と混合する濃縮混合工程を更に含む。
膜電解に用いる電力は、好ましくは再生可能エネルギーによって得られた電力を含む。
前記再生可能エネルギーによって得られた電力は、好ましくは、太陽光発電によって得られた電力、及び風力発電によって得られた電力からなる群から選ばれる少なくとも１つを含む。 The present invention relates to a method for recovering high-purity lithium salt from low-grade lithium carbonate, comprising: a step of obtaining low-grade lithium carbonate from at least one selected from the group consisting of minerals, salt water obtained from natural salt lakes, and seawater; an acid dissolution step of dissolving the low-grade lithium carbonate in a mineral acid; an impurity removal step of removing impurities from a crude lithium salt aqueous solution obtained in the acid dissolution step; and a membrane electrolysis step of performing membrane electrolysis on a first lithium salt aqueous solution obtained in the impurity removal step to produce a second lithium salt aqueous solution and a high-purity lithium hydroxide aqueous solution, wherein the impurities are removed by an ion exchange resin in the impurity removal step, the mineral acid produced in the membrane electrolysis step is used in the acid dissolution step, and the lithium salt concentration in the second lithium salt aqueous solution is lower than the lithium salt concentration in the first lithium salt aqueous solution.
The present invention preferably further includes a carbonation step in which carbon dioxide generated in the acid dissolution step is reacted with high-purity lithium hydroxide produced in the membrane electrolysis step to obtain high-purity lithium carbonate, thereby making it possible to effectively utilize a part of the carbon dioxide produced in the acid dissolution step without wasting it.
The present invention preferably further comprises a concentrating and mixing step of concentrating the second aqueous lithium salt solution and mixing the concentrated aqueous lithium salt solution with the first aqueous lithium salt solution.
The electricity used for the membrane electrolysis preferably includes electricity obtained from renewable energy.
The electric power obtained by the renewable energy preferably includes at least one selected from the group consisting of electric power obtained by solar power generation and electric power obtained by wind power generation.

本発明は、多大なエネルギーを費やさず、大量の廃棄物も発生させない、低品位炭酸リチウムから高純度リチウム塩を得る方法を提供する。 The present invention provides a method for obtaining high-purity lithium salt from low-grade lithium carbonate without using a large amount of energy or generating large amounts of waste.

本発明の低品位炭酸リチウムから高純度リチウム塩を得る方法の１実施態様を示す説明図。FIG. 1 is an explanatory diagram showing one embodiment of the method for obtaining a high-purity lithium salt from low-grade lithium carbonate of the present invention. 本発明の低品位炭酸リチウムから高純度リチウム塩を得る方法に用いるイオン交換膜電解槽の構造の１実施態様を示す説明的断面図。FIG. 1 is an explanatory cross-sectional view showing one embodiment of the structure of an ion exchange membrane electrolytic cell used in the method of obtaining a high-purity lithium salt from low-grade lithium carbonate of the present invention.

本発明について更に詳細に説明する。
なお、数値範囲の「～」は、断りがなければ、以上から以下を表し、両端の数値をいずれも含む。また、数値範囲を示したときは、上限値および下限値を適宜組み合わせることができ、それにより得られた数値範囲も開示したものとする。
さらに図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。また、図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる場合がある。 The present invention will now be described in further detail.
In addition, unless otherwise specified, "to" in a numerical range means from above to below, and both ends of the range are included. In addition, when a numerical range is indicated, the upper limit and the lower limit can be appropriately combined, and the numerical range obtained by combining them is also disclosed.
In addition, in the description of the drawings, the same elements are denoted by the same reference numerals, and duplicated description will be omitted. Also, the dimensional ratios of the drawings are exaggerated for the convenience of explanation, and may differ from the actual ratios.

本発明について、図面を参照しながら更に詳細に説明する。
＜低品位炭酸リチウム＞
前記低品位炭酸リチウムの供給源として、例えば、廃リチウムイオン電池からリサイクルされる低品位炭酸リチウム、鉱物、天然の塩湖から得られる塩水、海水等が挙げられる。
本発明の低品位炭酸リチウムから高純度リチウム塩を得る方法（以下、「本発明の方法」と称する）は、図１に示すように、低品位炭酸リチウム１を出発物質とする。 The invention will now be described in more detail with reference to the drawings.
<Low-grade lithium carbonate>
Examples of sources of the low-grade lithium carbonate include low-grade lithium carbonate recycled from waste lithium ion batteries, minerals, salt water obtained from natural salt lakes, seawater, and the like.
The method of the present invention for obtaining a high-purity lithium salt from low-grade lithium carbonate (hereinafter referred to as the "method of the present invention") starts with low-grade lithium carbonate 1 as a starting material, as shown in FIG.

＜酸溶解工程＞
本発明の方法は、前記低品位炭酸リチウム１を鉱酸に溶解する酸溶解工程（ＳＴＥＰ１）を含む。前記鉱酸は、例えば、塩酸、硫酸、及び硝酸からなる群から選択される少なくとも１種を含み、好ましくは塩酸を含み、より好ましくは塩酸である。前記酸溶解工程において、粗リチウム塩水溶液２及び二酸化炭素３が発生する。前記鉱酸が塩酸である場合、前記粗リチウム塩水溶液２は粗塩化リチウム水溶液である。前記酸溶解工程において発生する二酸化炭素３は、好ましくは後述する膜電解工程で生成する高純度水酸化リチウム４と反応させることにより高純度炭酸リチウム７を生成できる。したがって、本発明の方法では、大量の二酸化炭素の一部を廃棄することなく有効活用できる。 <Acid dissolution process>
The method of the present invention includes an acid dissolution step (STEP 1) of dissolving the low-grade lithium carbonate 1 in a mineral acid. The mineral acid includes at least one selected from the group consisting of, for example, hydrochloric acid, sulfuric acid, and nitric acid, preferably includes hydrochloric acid, and more preferably is hydrochloric acid. In the acid dissolution step, a crude lithium salt aqueous solution 2 and carbon dioxide 3 are generated. When the mineral acid is hydrochloric acid, the crude lithium salt aqueous solution 2 is a crude lithium chloride aqueous solution. The carbon dioxide 3 generated in the acid dissolution step can be reacted with high-purity lithium hydroxide 4 generated in a membrane electrolysis step described later to generate high-purity lithium carbonate 7. Therefore, in the method of the present invention, a large amount of carbon dioxide can be effectively utilized without being discarded.

＜不純物除去工程＞
本発明の方法は、前記粗リチウム塩水溶液から不純物を除去する不純物除去工程を含む。前記粗塩化リチウム水溶液は、アルカリ金属、アルカリ土類金属等の不純物を含有している。前記不純物は、前記不純物除去工程において、例えば強酸性陽イオン交換樹脂、キレート樹脂等のイオン交換樹脂により除去され、第１のリチウム塩水溶液が得られる。強酸性陽イオン交換樹脂としては、例えばＳＫ１１０（三菱ケミカル株式会社製）、キレート樹脂としては、例えばＣＲ－１１（三菱ケミカル株式会社製）が挙げられる。 <Impurity removal process>
The method of the present invention includes an impurity removing step of removing impurities from the crude lithium salt aqueous solution. The crude lithium chloride aqueous solution contains impurities such as alkali metals and alkaline earth metals. In the impurity removing step, the impurities are removed by an ion exchange resin such as a strongly acidic cation exchange resin or a chelating resin, to obtain a first lithium salt aqueous solution. An example of the strongly acidic cation exchange resin is SK110 (manufactured by Mitsubishi Chemical Corporation), and an example of the chelating resin is CR-11 (manufactured by Mitsubishi Chemical Corporation).

＜膜電解工程＞
本発明の方法は、前記第１のリチウム塩水溶液を、イオン交換膜を使用して膜電解し、第２のリチウム塩水溶液と高純度の水酸化リチウムを生成する膜電解工程（ＳＴＥＰ３）を含む。前記膜電解は、例えば、図２に示す膜電解槽１１を用いて行うことができる。 <Membrane electrolysis process>
The method of the present invention includes a membrane electrolysis step (STEP 3) of performing membrane electrolysis of the first lithium salt aqueous solution using an ion exchange membrane to produce a second lithium salt aqueous solution and high purity lithium hydroxide. The membrane electrolysis can be performed using, for example, a membrane electrolysis cell 11 shown in FIG. 2.

膜電解槽１１は、一方の内側面に陽極板１２を備え、陽極板１２と対向する内側面に陰極板１３を備え、陽極板１２は電源の陽極１４に接続され、陰極板１３は電源の陰極１５に接続されている。また、膜電解槽１１は、イオン交換膜１６により、陽極板１２を備える陽極室１７と、陰極板１３を備える陰極室１８とに区画されている。 The membrane electrolysis cell 11 has an anode plate 12 on one of its inner surfaces and a cathode plate 13 on the inner surface opposite the anode plate 12. The anode plate 12 is connected to the anode 14 of a power source, and the cathode plate 13 is connected to the cathode 15 of a power source. The membrane electrolysis cell 11 is also partitioned by an ion exchange membrane 16 into an anode chamber 17 containing the anode plate 12 and a cathode chamber 18 containing the cathode plate 13.

膜電解槽１１では、陽極室１７に前記第１のリチウム塩水溶液として、例えば塩化リチウムを供給して膜電解を行うと、塩化物イオンが陽極板１２上で塩素ガス（Ｃｌ２）を生成する一方、リチウムイオンはイオン交換膜１６を介して陰極室１８に移動する。 In the membrane electrolysis cell 11, when membrane electrolysis is performed by supplying, for example, lithium chloride as the first lithium salt aqueous solution to the anode chamber 17, chloride ions generate chlorine gas (Cl 2 ) on the anode plate 12, while lithium ions move to the cathode chamber 18 through the ion exchange membrane 16.

陰極室１８では水（Ｈ２Ｏ）が水酸化物イオン（ＯＨ－）と水素イオン（Ｈ＋）とに電離し、水素イオンが陰極板１３上で水素ガス（Ｈ２）を生成する一方、水酸化物イオンがリチウムと化合して高純度水酸化リチウム水溶液４を生成する。 In the cathode chamber 18, water (H 2 O) is ionized into hydroxide ions (OH − ) and hydrogen ions (H + ), and the hydrogen ions generate hydrogen gas (H 2 ) on the cathode plate 13, while the hydroxide ions combine with lithium to generate a high-purity lithium hydroxide aqueous solution 4.

前記膜電解工程に付されるリチウム塩水溶液が硫酸イオンを含む場合、陽極室１７で硫酸を得ることができる。前記膜電解工程に付されるリチウム塩水溶液が硝酸イオンを含む場合、陽極室１７で硝酸を得ることができる。すなわち、前記膜電解工程で鉱酸５を得ることができ、当該鉱酸５をＳＴＥＰ１の前記酸溶解工程で使用してよい。 When the lithium salt aqueous solution subjected to the membrane electrolysis process contains sulfate ions, sulfuric acid can be obtained in the anode chamber 17. When the lithium salt aqueous solution subjected to the membrane electrolysis process contains nitrate ions, nitric acid can be obtained in the anode chamber 17. In other words, mineral acid 5 can be obtained in the membrane electrolysis process, and the mineral acid 5 can be used in the acid dissolution process of STEP 1.

前記膜電解工程で得られた高純度水酸化リチウム水溶液４は、ＳＴＥＰ４で晶析により高純度水酸化リチウム一水和物（ＬｉＯＨ・Ｈ２Ｏ）６として回収することもでき、ＳＴＥＰ５で炭酸化することにより、高純度炭酸リチウム（Ｌｉ２ＣＯ３）７として回収することもできる。前記炭酸化は、好ましくは、高純度水酸化リチウム水溶液４を前記酸溶解工程（ＳＴＥＰ１）で発生する二酸化炭素３と反応させることにより実施される。 The high-purity lithium hydroxide aqueous solution 4 obtained in the membrane electrolysis step can be recovered as high-purity lithium hydroxide monohydrate (LiOH.H 2 O) 6 by crystallization in STEP 4, or can be recovered as high-purity lithium carbonate (Li 2 CO 3 ) 7 by carbonation in STEP 5. The carbonation is preferably carried out by reacting the high-purity lithium hydroxide aqueous solution 4 with carbon dioxide 3 generated in the acid dissolution step (STEP 1).

前記膜電解工程では、前記第１のリチウム塩水溶液が膜電解される結果、前記第１のリチウム塩水溶液中のリチウム塩濃度より小さいリチウム塩濃度を有する第２のリチウム塩水溶液と、高純度水酸化リチウム水溶液４が生成する。前記高純度水酸化リチウム水溶液４を晶析して得られる高純度水酸化リチウムの１水塩の純度は、例えば９９．５質量％以上である。
本発明の方法は、好ましくは、前記第２のリチウム塩水溶液を濃縮し（ＳＴＥＰ６）、濃縮されたリチウム塩水溶液を前記第１のリチウム塩水溶液と混合する濃縮混合工程を更に含む。前記濃縮の方法として、例えば逆浸透膜法が挙げられる。 In the membrane electrolysis step, the first lithium salt aqueous solution is subjected to membrane electrolysis to produce a second lithium salt aqueous solution having a lithium salt concentration lower than the lithium salt concentration in the first lithium salt aqueous solution, and a high-purity lithium hydroxide aqueous solution 4. The purity of the high-purity lithium hydroxide monohydrate obtained by crystallizing the high-purity lithium hydroxide aqueous solution 4 is, for example, 99.5 mass % or more.
The method of the present invention preferably further comprises a concentrating and mixing step of concentrating the second lithium salt aqueous solution (STEP 6) and mixing the concentrated lithium salt aqueous solution with the first lithium salt aqueous solution. As a method for the concentration, for example, a reverse osmosis membrane method can be mentioned.

前記膜電解工程に用いる電力は、例えば、太陽光発電により得られた電力、及び風力発電により得られた電力からなる群から選ばれる少なくとも１つの再生可能エネルギーを含んでいてよい。 The electricity used in the membrane electrolysis process may include at least one renewable energy source selected from the group consisting of electricity obtained by solar power generation and electricity obtained by wind power generation.

１…低品位炭酸リチウム、 ２…租リチウム塩水溶液、 ３…二酸化炭素、
４…高純度水酸化リチウム水溶液、 ５…鉱酸、 ６…高純度水酸化リチウム一水和物、７…高純度炭酸リチウム、１１…膜電解槽、 １６…イオン交換膜、 １７…陽極室、
１８…陰極室。
 1...Low-grade lithium carbonate, 2...Lithium salt aqueous solution, 3...Carbon dioxide,
4...High-purity lithium hydroxide aqueous solution, 5...Mineral acid, 6...High-purity lithium hydroxide monohydrate, 7...High-purity lithium carbonate, 11...Membrane electrolytic cell, 16...Ion exchange membrane, 17...Anode chamber,
18...Cathode chamber.

Claims (5)

低品位炭酸リチウムから高純度リチウム塩を得る方法であって、
鉱物、天然の塩湖から得られる塩水、及び海水からなる群から選ばれる少なくとも１つから低品位炭酸リチウムを得る工程、
当該低品位炭酸リチウムを鉱酸に溶解する酸溶解工程、
当該酸溶解工程で得られた粗リチウム塩水溶液から不純物を除去する不純物除去工程、及び
当該不純物除去工程で得られた第１のリチウム塩水溶液を膜電解し、第２のリチウム塩水溶液と高純度水酸化リチウム水溶液を生成する膜電解工程を含み、
当該不純物が、当該不純物除去工程においてイオン交換樹脂により除去され、
当該膜電解工程で生成する鉱酸を当該酸溶解工程で使用し、
当該第２のリチウム塩水溶液中のリチウム塩濃度は、当該第１のリチウム塩水溶液中のリチウム塩濃度より小さいことを特徴とする低品位炭酸リチウムから高純度リチウム塩を得る方法。 A method for obtaining a high-purity lithium salt from low-grade lithium carbonate, comprising the steps of:
Obtaining low-grade lithium carbonate from at least one selected from the group consisting of minerals, salt water obtained from a natural salt lake, and seawater;
an acid dissolution step of dissolving the low-grade lithium carbonate in a mineral acid;
an impurity removing step of removing impurities from the crude lithium salt aqueous solution obtained in the acid dissolution step; and a membrane electrolysis step of subjecting the first lithium salt aqueous solution obtained in the impurity removing step to membrane electrolysis to produce a second lithium salt aqueous solution and a high-purity lithium hydroxide aqueous solution,
The impurities are removed by an ion exchange resin in the impurity removal step,
The mineral acid produced in the membrane electrolysis step is used in the acid dissolution step;
A method for obtaining a high-purity lithium salt from low-grade lithium carbonate, characterized in that the lithium salt concentration in the second lithium salt aqueous solution is lower than the lithium salt concentration in the first lithium salt aqueous solution. 請求項１に記載された低品位炭酸リチウムから高純度リチウム塩を得る方法において、前記酸溶解工程で発生する二酸化炭素と前記膜電解工程で生成する高純度水酸化リチウムを反応させて、高純度炭酸リチウムを得る炭酸化工程を更に含むことを特徴とする低品位炭酸リチウムから高純度リチウム塩を得る方法。 The method for obtaining high-purity lithium salt from low-grade lithium carbonate described in claim 1 further includes a carbonation step in which carbon dioxide generated in the acid dissolution step reacts with high-purity lithium hydroxide generated in the membrane electrolysis step to obtain high-purity lithium carbonate. 請求項１に記載された低品位炭酸リチウムから高純度リチウム塩を得る方法において、前記第２のリチウム塩水溶液を濃縮し、濃縮されたリチウム塩水溶液を前記第１のリチウム塩水溶液と混合する濃縮混合工程を更に含むことを特徴とする低品位炭酸リチウムから高純度リチウム塩を得る方法。 The method for obtaining high-purity lithium salt from low-grade lithium carbonate according to claim 1, further comprising a concentrating and mixing step of concentrating the second lithium salt aqueous solution and mixing the concentrated lithium salt aqueous solution with the first lithium salt aqueous solution. 請求項１～３のいずれか１項に記載された低品位炭酸リチウムから高純度リチウム塩を得る方法であって、
膜電解に用いる電力が再生可能エネルギーによって得られた電力を含むこと特徴とする炭酸リチウムからリチウムを回収する方法。 A method for obtaining a high-purity lithium salt from the low-grade lithium carbonate according to any one of claims 1 to 3, comprising the steps of:
A method for recovering lithium from lithium carbonate, characterized in that the electricity used in membrane electrolysis includes electricity obtained from renewable energy. 請求項４に記載された低品位炭酸リチウムから高純度リチウム塩を得る方法であって、
前記再生可能エネルギーによって得られた電力が、太陽光発電によって得られた電力、及び風力発電によって得られた電力からなる群から選ばれる少なくとも１つを含むこと特徴とする低品位炭酸リチウムから高純度リチウム塩を得る方法。 A method for obtaining a high-purity lithium salt from low-grade lithium carbonate according to claim 4, comprising the steps of:
The method for obtaining a high-purity lithium salt from low-grade lithium carbonate, wherein the electricity obtained by renewable energy includes at least one selected from the group consisting of electricity obtained by solar power generation and electricity obtained by wind power generation.
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JP2001508925A (en) 1997-06-23 2001-07-03 パシフィック・リシアム・リミテッド Lithium recovery and purification
WO2021256732A1 (en) 2020-06-18 2021-12-23 에스케이이노베이션 주식회사 Method for recovering active metal of lithium secondary battery
JP7060899B1 (en) 2021-09-30 2022-04-27 株式会社アサカ理研 Lithium recovery system from waste lithium-ion batteries
WO2022230861A1 (en) 2021-04-26 2022-11-03 株式会社アサカ理研 Method for processing waste lithium ion battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001508925A (en) 1997-06-23 2001-07-03 パシフィック・リシアム・リミテッド Lithium recovery and purification
WO2021256732A1 (en) 2020-06-18 2021-12-23 에스케이이노베이션 주식회사 Method for recovering active metal of lithium secondary battery
WO2022230861A1 (en) 2021-04-26 2022-11-03 株式会社アサカ理研 Method for processing waste lithium ion battery
JP7060899B1 (en) 2021-09-30 2022-04-27 株式会社アサカ理研 Lithium recovery system from waste lithium-ion batteries

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