Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K
The development of a recycling process for rare-earth-containing waste is important for improving the resource conservation and resource security of rare-earth metals. Phase equilibria between the molten fluoride and rare-earth oxide were investigated to develop a novel recycling process for neodymi...
Gespeichert in:
| Veröffentlicht in: | Journal of sustainable metallurgy 2022-12, Vol.8 (4), p.1498-1508 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 1508 |
|---|---|
| container_issue | 4 |
| container_start_page | 1498 |
| container_title | Journal of sustainable metallurgy |
| container_volume | 8 |
| creator | Takeda, Osamu Nakano, Kiyotaka Kobayashi, Fumiyoshi Lu, Xin Sato, Yuzuru Zhu, Hogmin |
| description | The development of a recycling process for rare-earth-containing waste is important for improving the resource conservation and resource security of rare-earth metals. Phase equilibria between the molten fluoride and rare-earth oxide were investigated to develop a novel recycling process for neodymium magnets based on the flux-remelting method. LiF—rare-earth fluoride (REF
3
, RE = Nd, Dy) mixtures and rare-earth oxides (RE
2
O
3
, RE = Nd, Dy) were selected, and the phase equilibria in the Nd
2
O
3
−NdF
3
−Li
2
O−LiF and Dy
2
O
3
−DyF
3
−Li
2
O−LiF systems were investigated by differential thermal analysis and chemical equilibrating method. It was revealed that compounds NdOF, Nd
4
O
3
F
6
, DyOF, and Dy
4
O
3
F
6
were stable as an equilibrium phase at 1473 K. In the dissolution of Nd
2
O
3
in molten LiF–NdF
3
, Nd
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of the melt and the compound coexists with the melt. In the same manner, Dy
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of molten LiF-DyF
3
and the compound coexists with the melt. At 1473 K, the solubilities of Nd
2
O
3
in molten LiF—50 mol% NdF
3
and Dy
2
O
3
in molten LiF—50 mol% DyF
3
were determined as 7.4 mass% and 7.6 mass%, respectively. An enhancement device for the dissolution rate of oxyfluorides is required for practical applications owing to the slow dissolution rate. The recycling process can be used to regenerate neodymium magnet waste by adding a small amount of virgin rare-earth metals.
Graphical Abstract |
| doi_str_mv | 10.1007/s40831-022-00617-6 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2747917580</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2747917580</sourcerecordid><originalsourceid>FETCH-LOGICAL-c359t-41d7a77450b7288e8e349748944df90296bcf8d933f2467935067ceec64712be3</originalsourceid><addsrcrecordid>eNp9kE1KA0EQhRtRMEQv4GrAjYKt1T_T1b1QkJioGAxEXTfz0yMTYiZ2TxbZufUWnsWjeBJbR3TnoqhH8d4r-AjZY3DMAPAkSNCCUeCcAiiGVG2QHmfGUBHvm7-ai22yG8IMADgKich65Oyuma_yel63tQtJUyXTIZ-IpF5EMRJ0XI-Sg-nw4-X1NM5teZRcrA-TrE2YRPH-drNDtqpsHtzuz-6Th9HwfnBFx5PL68H5mBYiNS2VrMQMUaaQI9faaSekQamNlGVlgBuVF5UujRAVlwqNSEFh4VyhJDKeO9En-13v0jfPKxdaO2tWfhFfWo4SDcNUQ3TxzlX4JgTvKrv09VPm15aB_UJlO1Q2orLfqKyKIdGFQjQvHp3_q_4n9QmNqmeh</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2747917580</pqid></control><display><type>article</type><title>Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K</title><source>SpringerLink Journals - AutoHoldings</source><creator>Takeda, Osamu ; Nakano, Kiyotaka ; Kobayashi, Fumiyoshi ; Lu, Xin ; Sato, Yuzuru ; Zhu, Hogmin</creator><creatorcontrib>Takeda, Osamu ; Nakano, Kiyotaka ; Kobayashi, Fumiyoshi ; Lu, Xin ; Sato, Yuzuru ; Zhu, Hogmin</creatorcontrib><description>The development of a recycling process for rare-earth-containing waste is important for improving the resource conservation and resource security of rare-earth metals. Phase equilibria between the molten fluoride and rare-earth oxide were investigated to develop a novel recycling process for neodymium magnets based on the flux-remelting method. LiF—rare-earth fluoride (REF
3
, RE = Nd, Dy) mixtures and rare-earth oxides (RE
2
O
3
, RE = Nd, Dy) were selected, and the phase equilibria in the Nd
2
O
3
−NdF
3
−Li
2
O−LiF and Dy
2
O
3
−DyF
3
−Li
2
O−LiF systems were investigated by differential thermal analysis and chemical equilibrating method. It was revealed that compounds NdOF, Nd
4
O
3
F
6
, DyOF, and Dy
4
O
3
F
6
were stable as an equilibrium phase at 1473 K. In the dissolution of Nd
2
O
3
in molten LiF–NdF
3
, Nd
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of the melt and the compound coexists with the melt. In the same manner, Dy
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of molten LiF-DyF
3
and the compound coexists with the melt. At 1473 K, the solubilities of Nd
2
O
3
in molten LiF—50 mol% NdF
3
and Dy
2
O
3
in molten LiF—50 mol% DyF
3
were determined as 7.4 mass% and 7.6 mass%, respectively. An enhancement device for the dissolution rate of oxyfluorides is required for practical applications owing to the slow dissolution rate. The recycling process can be used to regenerate neodymium magnet waste by adding a small amount of virgin rare-earth metals.
Graphical Abstract</description><identifier>ISSN: 2199-3823</identifier><identifier>EISSN: 2199-3831</identifier><identifier>DOI: 10.1007/s40831-022-00617-6</identifier><language>eng</language><publisher>Cham: Springer International Publishing</publisher><subject>Differential thermal analysis ; Dissolution ; Dysprosium ; Earth and Environmental Science ; Environment ; Fluorides ; Lithium oxides ; Melting ; Metallic Materials ; Mixing ratio ; Neodymium ; Oxyfluorides ; Permanent magnets ; Phase equilibria ; Rare earth oxides ; Recycling ; Resource conservation ; Solubility ; Sustainable Development ; Thematic Section: REWAS 2022: Developing Tomorrow's Technical Cycles</subject><ispartof>Journal of sustainable metallurgy, 2022-12, Vol.8 (4), p.1498-1508</ispartof><rights>The Minerals, Metals & Materials Society 2022</rights><rights>The Minerals, Metals & Materials Society 2022.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c359t-41d7a77450b7288e8e349748944df90296bcf8d933f2467935067ceec64712be3</citedby><cites>FETCH-LOGICAL-c359t-41d7a77450b7288e8e349748944df90296bcf8d933f2467935067ceec64712be3</cites><orcidid>0000-0002-5257-6680</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s40831-022-00617-6$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s40831-022-00617-6$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Takeda, Osamu</creatorcontrib><creatorcontrib>Nakano, Kiyotaka</creatorcontrib><creatorcontrib>Kobayashi, Fumiyoshi</creatorcontrib><creatorcontrib>Lu, Xin</creatorcontrib><creatorcontrib>Sato, Yuzuru</creatorcontrib><creatorcontrib>Zhu, Hogmin</creatorcontrib><title>Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K</title><title>Journal of sustainable metallurgy</title><addtitle>J. Sustain. Metall</addtitle><description>The development of a recycling process for rare-earth-containing waste is important for improving the resource conservation and resource security of rare-earth metals. Phase equilibria between the molten fluoride and rare-earth oxide were investigated to develop a novel recycling process for neodymium magnets based on the flux-remelting method. LiF—rare-earth fluoride (REF
3
, RE = Nd, Dy) mixtures and rare-earth oxides (RE
2
O
3
, RE = Nd, Dy) were selected, and the phase equilibria in the Nd
2
O
3
−NdF
3
−Li
2
O−LiF and Dy
2
O
3
−DyF
3
−Li
2
O−LiF systems were investigated by differential thermal analysis and chemical equilibrating method. It was revealed that compounds NdOF, Nd
4
O
3
F
6
, DyOF, and Dy
4
O
3
F
6
were stable as an equilibrium phase at 1473 K. In the dissolution of Nd
2
O
3
in molten LiF–NdF
3
, Nd
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of the melt and the compound coexists with the melt. In the same manner, Dy
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of molten LiF-DyF
3
and the compound coexists with the melt. At 1473 K, the solubilities of Nd
2
O
3
in molten LiF—50 mol% NdF
3
and Dy
2
O
3
in molten LiF—50 mol% DyF
3
were determined as 7.4 mass% and 7.6 mass%, respectively. An enhancement device for the dissolution rate of oxyfluorides is required for practical applications owing to the slow dissolution rate. The recycling process can be used to regenerate neodymium magnet waste by adding a small amount of virgin rare-earth metals.
Graphical Abstract</description><subject>Differential thermal analysis</subject><subject>Dissolution</subject><subject>Dysprosium</subject><subject>Earth and Environmental Science</subject><subject>Environment</subject><subject>Fluorides</subject><subject>Lithium oxides</subject><subject>Melting</subject><subject>Metallic Materials</subject><subject>Mixing ratio</subject><subject>Neodymium</subject><subject>Oxyfluorides</subject><subject>Permanent magnets</subject><subject>Phase equilibria</subject><subject>Rare earth oxides</subject><subject>Recycling</subject><subject>Resource conservation</subject><subject>Solubility</subject><subject>Sustainable Development</subject><subject>Thematic Section: REWAS 2022: Developing Tomorrow's Technical Cycles</subject><issn>2199-3823</issn><issn>2199-3831</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp9kE1KA0EQhRtRMEQv4GrAjYKt1T_T1b1QkJioGAxEXTfz0yMTYiZ2TxbZufUWnsWjeBJbR3TnoqhH8d4r-AjZY3DMAPAkSNCCUeCcAiiGVG2QHmfGUBHvm7-ai22yG8IMADgKich65Oyuma_yel63tQtJUyXTIZ-IpF5EMRJ0XI-Sg-nw4-X1NM5teZRcrA-TrE2YRPH-drNDtqpsHtzuz-6Th9HwfnBFx5PL68H5mBYiNS2VrMQMUaaQI9faaSekQamNlGVlgBuVF5UujRAVlwqNSEFh4VyhJDKeO9En-13v0jfPKxdaO2tWfhFfWo4SDcNUQ3TxzlX4JgTvKrv09VPm15aB_UJlO1Q2orLfqKyKIdGFQjQvHp3_q_4n9QmNqmeh</recordid><startdate>20221201</startdate><enddate>20221201</enddate><creator>Takeda, Osamu</creator><creator>Nakano, Kiyotaka</creator><creator>Kobayashi, Fumiyoshi</creator><creator>Lu, Xin</creator><creator>Sato, Yuzuru</creator><creator>Zhu, Hogmin</creator><general>Springer International Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-5257-6680</orcidid></search><sort><creationdate>20221201</creationdate><title>Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K</title><author>Takeda, Osamu ; Nakano, Kiyotaka ; Kobayashi, Fumiyoshi ; Lu, Xin ; Sato, Yuzuru ; Zhu, Hogmin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c359t-41d7a77450b7288e8e349748944df90296bcf8d933f2467935067ceec64712be3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Differential thermal analysis</topic><topic>Dissolution</topic><topic>Dysprosium</topic><topic>Earth and Environmental Science</topic><topic>Environment</topic><topic>Fluorides</topic><topic>Lithium oxides</topic><topic>Melting</topic><topic>Metallic Materials</topic><topic>Mixing ratio</topic><topic>Neodymium</topic><topic>Oxyfluorides</topic><topic>Permanent magnets</topic><topic>Phase equilibria</topic><topic>Rare earth oxides</topic><topic>Recycling</topic><topic>Resource conservation</topic><topic>Solubility</topic><topic>Sustainable Development</topic><topic>Thematic Section: REWAS 2022: Developing Tomorrow's Technical Cycles</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Takeda, Osamu</creatorcontrib><creatorcontrib>Nakano, Kiyotaka</creatorcontrib><creatorcontrib>Kobayashi, Fumiyoshi</creatorcontrib><creatorcontrib>Lu, Xin</creatorcontrib><creatorcontrib>Sato, Yuzuru</creatorcontrib><creatorcontrib>Zhu, Hogmin</creatorcontrib><collection>CrossRef</collection><jtitle>Journal of sustainable metallurgy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Takeda, Osamu</au><au>Nakano, Kiyotaka</au><au>Kobayashi, Fumiyoshi</au><au>Lu, Xin</au><au>Sato, Yuzuru</au><au>Zhu, Hogmin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K</atitle><jtitle>Journal of sustainable metallurgy</jtitle><stitle>J. Sustain. Metall</stitle><date>2022-12-01</date><risdate>2022</risdate><volume>8</volume><issue>4</issue><spage>1498</spage><epage>1508</epage><pages>1498-1508</pages><issn>2199-3823</issn><eissn>2199-3831</eissn><abstract>The development of a recycling process for rare-earth-containing waste is important for improving the resource conservation and resource security of rare-earth metals. Phase equilibria between the molten fluoride and rare-earth oxide were investigated to develop a novel recycling process for neodymium magnets based on the flux-remelting method. LiF—rare-earth fluoride (REF
3
, RE = Nd, Dy) mixtures and rare-earth oxides (RE
2
O
3
, RE = Nd, Dy) were selected, and the phase equilibria in the Nd
2
O
3
−NdF
3
−Li
2
O−LiF and Dy
2
O
3
−DyF
3
−Li
2
O−LiF systems were investigated by differential thermal analysis and chemical equilibrating method. It was revealed that compounds NdOF, Nd
4
O
3
F
6
, DyOF, and Dy
4
O
3
F
6
were stable as an equilibrium phase at 1473 K. In the dissolution of Nd
2
O
3
in molten LiF–NdF
3
, Nd
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of the melt and the compound coexists with the melt. In the same manner, Dy
4
O
3
F
6
formed when the mixing ratio exceeds the solubility limit of molten LiF-DyF
3
and the compound coexists with the melt. At 1473 K, the solubilities of Nd
2
O
3
in molten LiF—50 mol% NdF
3
and Dy
2
O
3
in molten LiF—50 mol% DyF
3
were determined as 7.4 mass% and 7.6 mass%, respectively. An enhancement device for the dissolution rate of oxyfluorides is required for practical applications owing to the slow dissolution rate. The recycling process can be used to regenerate neodymium magnet waste by adding a small amount of virgin rare-earth metals.
Graphical Abstract</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s40831-022-00617-6</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-5257-6680</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 2199-3823 |
| ispartof | Journal of sustainable metallurgy, 2022-12, Vol.8 (4), p.1498-1508 |
| issn | 2199-3823 2199-3831 |
| language | eng |
| recordid | cdi_proquest_journals_2747917580 |
| source | SpringerLink Journals - AutoHoldings |
| subjects | Differential thermal analysis Dissolution Dysprosium Earth and Environmental Science Environment Fluorides Lithium oxides Melting Metallic Materials Mixing ratio Neodymium Oxyfluorides Permanent magnets Phase equilibria Rare earth oxides Recycling Resource conservation Solubility Sustainable Development Thematic Section: REWAS 2022: Developing Tomorrow's Technical Cycles |
| title | Solubilities of RE2O3 in REF3-LiF (RE = Nd, Dy) at 1473 K |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-05T18%3A08%3A27IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Solubilities%20of%20RE2O3%20in%20REF3-LiF%20(RE%E2%80%89=%E2%80%89Nd,%20Dy)%20at%201473%C2%A0K&rft.jtitle=Journal%20of%20sustainable%20metallurgy&rft.au=Takeda,%20Osamu&rft.date=2022-12-01&rft.volume=8&rft.issue=4&rft.spage=1498&rft.epage=1508&rft.pages=1498-1508&rft.issn=2199-3823&rft.eissn=2199-3831&rft_id=info:doi/10.1007/s40831-022-00617-6&rft_dat=%3Cproquest_cross%3E2747917580%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2747917580&rft_id=info:pmid/&rfr_iscdi=true |