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An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste. / Venkatesan, Prakash; Sun, Z.H.I.; Sietsma, Jilt; Yang, Yongxiang.

In: Separation and Purification Technology, Vol. 191, 2018, p. 384-391.

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@article{7950fa2e214442879f437146e1675c60,
title = "An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste",
abstract = "In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(II) in the leachate to Fe(III). Finally, oxalic acid was added directly to the electro-oxidized leachate which selectively precipitated more than 98{\%} of rare earth elements as rare-earth oxalates. The calcination of rare-earth oxalates produced mixed rare-earth oxides of 99.2{\%} purity and a marketable Fe(III) solution as by-product. The electro-oxidized leachate was also subjected to an alternative neutralization route in which ammonium hydroxide was added to remove iron as ferric hydroxide. The iron free leachate with rare earth elements and cobalt was then subjected to oxalic acid precipitation treatment, which finally produced rare-earth oxides of 99.7{\%} purity. Furthermore, a cobalt-rich solution was obtained in the end and electrowinning studies performed on the solution showed the feasibility of recovering pure metallic cobalt.",
author = "Prakash Venkatesan and Z.H.I. Sun and Jilt Sietsma and Yongxiang Yang",
note = "Accepted Author Manuscript",
year = "2018",
doi = "10.1016/j.seppur.2017.09.053",
language = "English",
volume = "191",
pages = "384--391",
journal = "Separation and Purification Technology",
issn = "1383-5866",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - An environmentally friendly electro-oxidative approach to recover valuable elements from NdFeB magnet waste

AU - Venkatesan, Prakash

AU - Sun, Z.H.I.

AU - Sietsma, Jilt

AU - Yang, Yongxiang

N1 - Accepted Author Manuscript

PY - 2018

Y1 - 2018

N2 - In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(II) in the leachate to Fe(III). Finally, oxalic acid was added directly to the electro-oxidized leachate which selectively precipitated more than 98% of rare earth elements as rare-earth oxalates. The calcination of rare-earth oxalates produced mixed rare-earth oxides of 99.2% purity and a marketable Fe(III) solution as by-product. The electro-oxidized leachate was also subjected to an alternative neutralization route in which ammonium hydroxide was added to remove iron as ferric hydroxide. The iron free leachate with rare earth elements and cobalt was then subjected to oxalic acid precipitation treatment, which finally produced rare-earth oxides of 99.7% purity. Furthermore, a cobalt-rich solution was obtained in the end and electrowinning studies performed on the solution showed the feasibility of recovering pure metallic cobalt.

AB - In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(II) in the leachate to Fe(III). Finally, oxalic acid was added directly to the electro-oxidized leachate which selectively precipitated more than 98% of rare earth elements as rare-earth oxalates. The calcination of rare-earth oxalates produced mixed rare-earth oxides of 99.2% purity and a marketable Fe(III) solution as by-product. The electro-oxidized leachate was also subjected to an alternative neutralization route in which ammonium hydroxide was added to remove iron as ferric hydroxide. The iron free leachate with rare earth elements and cobalt was then subjected to oxalic acid precipitation treatment, which finally produced rare-earth oxides of 99.7% purity. Furthermore, a cobalt-rich solution was obtained in the end and electrowinning studies performed on the solution showed the feasibility of recovering pure metallic cobalt.

UR - http://resolver.tudelft.nl/uuid:7950fa2e-2144-4287-9f43-7146e1675c60

UR - http://www.scopus.com/inward/record.url?scp=85030558111&partnerID=8YFLogxK

U2 - 10.1016/j.seppur.2017.09.053

DO - 10.1016/j.seppur.2017.09.053

M3 - Article

VL - 191

SP - 384

EP - 391

JO - Separation and Purification Technology

T2 - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

ER -

ID: 31756751