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Recovery of neodymium as (Na, Nd)(SO4)2 from the ferrous fraction of a general WEEE shredder stream. / Peelman, Sebastiaan; Sietsma, Jilt; Yang, Yongxiang.

In: Journal of Sustainable Metallurgy, Vol. 4, No. 2, 2018, p. 276-287.

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Peelman, Sebastiaan ; Sietsma, Jilt ; Yang, Yongxiang. / Recovery of neodymium as (Na, Nd)(SO4)2 from the ferrous fraction of a general WEEE shredder stream. In: Journal of Sustainable Metallurgy. 2018 ; Vol. 4, No. 2. pp. 276-287.

BibTeX

@article{7be16c7f8c034f39a319c6e60ea0a9a6,
title = "Recovery of neodymium as (Na, Nd)(SO4)2 from the ferrous fraction of a general WEEE shredder stream",
abstract = "Neodymium is a critical element used in many high-tech applications. However, despite this, the EU is entirely dependent on China for its Nd supply. This has driven the EU to develop recycling strategies to recover its Nd from end-of-life (EoL) products and wastes, and establish a domestic supply. This paper proposes a process to recycle Nd from NdFeB magnet particles present in the ferrous fraction of shredded “Waste Electrical and Electronic Equipment” (WEEE), after physical upgrading. This WEEE fraction represents a waste stream that has not been previously considered a source of Nd. A three-step process was developed. First, the upgraded ferrous WEEE fraction is oxidized by means of water corrosion. Second, the oxidized WEEE is leached with diluted H2SO4 to selectively extract Nd and other nonferrous elements. And finally, the leach liquor is treated with Na2SO4 to precipitate the Nd as its double sulfate (Nd, Na)(SO4)2. The oxidation process oxidizes 93% of the metallic iron to Fe(OH)3, leaving 7% of the iron unoxidized. The leaching process dissolves between 70 and 99% of the Nd, depending on the temperature and liquid/solid ratio (L/S); this is accompanied by an iron coextraction between 9 and 20%. The precipitation recovers 92% of the leached Nd. The purity of the obtained precipitates is dependent on the pH at which the precipitation takes place. A pH below 0.5 is required to prevent Fe contamination, and a pH below 0 reduces the Ca contamination to below 1 wt%. The developed process provides an effective and low-cost method to recycle Nd from a shredded WEEE stream with an overall Nd recovery of over 90%.",
keywords = "WEEE recycling, Neodymium, Rare earth elements, Secondary resources, Rare earth recycling",
author = "Sebastiaan Peelman and Jilt Sietsma and Yongxiang Yang",
year = "2018",
doi = "10.1007/s40831-018-0165-5",
language = "English",
volume = "4",
pages = "276--287",
journal = "Journal of Sustainable Metallurgy",
issn = "2199-3823",
publisher = "Springer",
number = "2",

}

RIS

TY - JOUR

T1 - Recovery of neodymium as (Na, Nd)(SO4)2 from the ferrous fraction of a general WEEE shredder stream

AU - Peelman, Sebastiaan

AU - Sietsma, Jilt

AU - Yang, Yongxiang

PY - 2018

Y1 - 2018

N2 - Neodymium is a critical element used in many high-tech applications. However, despite this, the EU is entirely dependent on China for its Nd supply. This has driven the EU to develop recycling strategies to recover its Nd from end-of-life (EoL) products and wastes, and establish a domestic supply. This paper proposes a process to recycle Nd from NdFeB magnet particles present in the ferrous fraction of shredded “Waste Electrical and Electronic Equipment” (WEEE), after physical upgrading. This WEEE fraction represents a waste stream that has not been previously considered a source of Nd. A three-step process was developed. First, the upgraded ferrous WEEE fraction is oxidized by means of water corrosion. Second, the oxidized WEEE is leached with diluted H2SO4 to selectively extract Nd and other nonferrous elements. And finally, the leach liquor is treated with Na2SO4 to precipitate the Nd as its double sulfate (Nd, Na)(SO4)2. The oxidation process oxidizes 93% of the metallic iron to Fe(OH)3, leaving 7% of the iron unoxidized. The leaching process dissolves between 70 and 99% of the Nd, depending on the temperature and liquid/solid ratio (L/S); this is accompanied by an iron coextraction between 9 and 20%. The precipitation recovers 92% of the leached Nd. The purity of the obtained precipitates is dependent on the pH at which the precipitation takes place. A pH below 0.5 is required to prevent Fe contamination, and a pH below 0 reduces the Ca contamination to below 1 wt%. The developed process provides an effective and low-cost method to recycle Nd from a shredded WEEE stream with an overall Nd recovery of over 90%.

AB - Neodymium is a critical element used in many high-tech applications. However, despite this, the EU is entirely dependent on China for its Nd supply. This has driven the EU to develop recycling strategies to recover its Nd from end-of-life (EoL) products and wastes, and establish a domestic supply. This paper proposes a process to recycle Nd from NdFeB magnet particles present in the ferrous fraction of shredded “Waste Electrical and Electronic Equipment” (WEEE), after physical upgrading. This WEEE fraction represents a waste stream that has not been previously considered a source of Nd. A three-step process was developed. First, the upgraded ferrous WEEE fraction is oxidized by means of water corrosion. Second, the oxidized WEEE is leached with diluted H2SO4 to selectively extract Nd and other nonferrous elements. And finally, the leach liquor is treated with Na2SO4 to precipitate the Nd as its double sulfate (Nd, Na)(SO4)2. The oxidation process oxidizes 93% of the metallic iron to Fe(OH)3, leaving 7% of the iron unoxidized. The leaching process dissolves between 70 and 99% of the Nd, depending on the temperature and liquid/solid ratio (L/S); this is accompanied by an iron coextraction between 9 and 20%. The precipitation recovers 92% of the leached Nd. The purity of the obtained precipitates is dependent on the pH at which the precipitation takes place. A pH below 0.5 is required to prevent Fe contamination, and a pH below 0 reduces the Ca contamination to below 1 wt%. The developed process provides an effective and low-cost method to recycle Nd from a shredded WEEE stream with an overall Nd recovery of over 90%.

KW - WEEE recycling

KW - Neodymium

KW - Rare earth elements

KW - Secondary resources

KW - Rare earth recycling

UR - http://resolver.tudelft.nl/uuid:7be16c7f-8c03-4f39-a319-c6e60ea0a9a6

U2 - 10.1007/s40831-018-0165-5

DO - 10.1007/s40831-018-0165-5

M3 - Article

VL - 4

SP - 276

EP - 287

JO - Journal of Sustainable Metallurgy

JF - Journal of Sustainable Metallurgy

SN - 2199-3823

IS - 2

ER -

ID: 46785035