JP6314814B2 - 廃リチウムイオン電池からの有価金属の回収方法 - Google Patents
廃リチウムイオン電池からの有価金属の回収方法 Download PDFInfo
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- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 2
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- OFOUIYGUOUTLLP-UHFFFAOYSA-N 2,4,4-trimethyl-1-(2,4,4-trimethylpentoxyphosphonoyloxy)pentane Chemical compound CC(C)(C)CC(C)COP(=O)OCC(C)CC(C)(C)C OFOUIYGUOUTLLP-UHFFFAOYSA-N 0.000 description 1
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- 241000080590 Niso Species 0.000 description 1
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- ZLMKQJQJURXYLC-UHFFFAOYSA-N bis(2-ethylhexoxy)-oxophosphanium Chemical group CCCCC(CC)CO[P+](=O)OCC(CC)CCCC ZLMKQJQJURXYLC-UHFFFAOYSA-N 0.000 description 1
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- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Description
2.中和工程
3.溶媒抽出工程
4.逆抽出工程
浸出工程S11では、図1に示すように、廃リチウムイオン電池に前処理を施して得られた有価金属含有物と酸性溶液とを混合及び加温して溶解することにより、有価金属を含んだ浸出液と浸出残渣とを得る。
→ Li3PO4+6LiF+8Ni+6O2 ・・・(1)
中和工程S12では、図1に示すように、浸出工程S11で得られた浸出液を中和剤で中和して中和終液と中和澱物とが得られ、不純物の一部を中和澱物として除去する。
→ 2Al(OH)3+3Na2SO4 ・・・(3)
→ 2Al(OH)3+AlPO4+AlF3+3Na2SO4+3Li2SO4 ・・・(4)
溶媒抽出工程S13では、図1に示すように、中和工程S12で得られた中和終液について、溶媒抽出処理を行うことにより、不純物を含んだ抽出残液と、有価金属を含んだ抽出後の有機溶媒(以下、「抽出後有機溶媒」と称する。)とを得る。
逆抽出工程S14では、図1に示すように、溶媒抽出工程S13で得られた抽出後有機溶媒を硫酸溶液で逆抽出することにより、有価金属を含んだ逆抽出液を得る。
(有価金属含有物の準備)
実施例1では、廃リチウムイオン電池を200℃にて加熱処理したものを、破砕及び選別することにより得られた、廃リチウムイオン電池の有価金属含有物(以下、単に「有価金属含有物」と称する。)を原料として用いた。
実施例1では、表1に化学組成を示した有価金属含有物30gを、300mLの水に装入して撹拌し、ウォーターバスにて80℃に維持しながら、水溶液のpH値が1を維持するように64重量%の硫酸を断続的に添加した。
実施例1では、表2に化学組成を示した浸出液294mLに、水溶液のpH値が5.5となるように8mol/Lの水酸化ナトリウム水溶液を添加して、水溶液中に中和澱物を生成させた。
実施例1では、pH値5.5の中和終液100mLを分液ロートに採取し、ジ(2−エチルヘキシル)ホスホン酸(D2EHPA)濃度が20体積%になるように、テクリーン(登録商標)(JX日石日鉱エネルギー株式会社製)で希釈した有機溶媒900mLを中和終液に加え、溶媒抽出操作を行った。
実施例1では、次いで、ニッケル及びコバルトを含有する抽出後有機溶媒に、pH値が1の硫酸溶液100mLを添加し、逆抽出操作を行った。
Claims (5)
- 廃リチウムイオン電池から、湿式処理法によりニッケル及びコバルトを分離回収する廃リチウムイオン電池からの有価金属の回収方法であって、
前記廃リチウムイオン電池より得られた有価金属含有物を、酸性溶液に混合して溶解した後に、浸出液と浸出残渣とに分離する浸出工程と、
前記浸出工程で得られた浸出液に中和剤を添加して、中和終液とアルミニウムを含有する中和澱物とに分離する中和工程と、
前記中和工程で得られた中和終液について、酸性抽出剤による溶媒抽出処理を行い、ニッケル及びコバルトを含有する抽出後の有機溶媒とリン及びフッ素を含有する抽出残液とを得る溶媒抽出工程と、
前記溶媒抽出工程で得られた抽出後の有機溶媒を、硫酸溶液で逆抽出することでニッケル及びコバルトを含有する逆抽出液を得る逆抽出工程とを含み、
前記酸性抽出剤は、ジ(2−エチルヘキシル)ホスホン酸であることを特徴とする廃リチウムイオン電池からの有価金属の回収方法。 - 前記中和工程において、前記中和剤を添加して前記浸出液のpH値を4.5〜6.0に調整することを特徴とする請求項1に記載の廃リチウムイオン電池からの有価金属の回収方法。
- 前記溶媒抽出工程において、アルカリを添加して溶媒抽出時の水相のpH値を5.0〜6.5に調整することを特徴とする請求項1又は2に記載の廃リチウムイオン電池からの有価金属の回収方法。
- 前記逆抽出工程において、硫酸溶液を添加して逆抽出時の水相のpH値を0〜4.0に調整することを特徴とする請求項1乃至3の何れか1項に記載の廃リチウムイオン電池からの有価金属の回収方法。
- 前記溶媒抽出工程で得られた抽出残液に、中和剤を添加して、リン及びフッ素を含有する沈澱物を生成させ、該リン及びフッ素を分離除去することを特徴とする請求項1乃至4の何れか1項に記載の廃リチウムイオン電池からの有価金属の回収方法。
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