[논문]Recycling of Rare Earth Elements

Lorenz, Tom; Bertau, Martin

doi:10.1515/psr-2016-0067

Recycling of Rare Earth Elements 원문보기

Physical sciences reviews, v.2 no.1, 2017년, pp.20160067 -

Lorenz, Tom , Bertau, Martin

Abstract

AbstractAny development of an effective process for rare earth (RE) recycling has become more and more challenging, especially in recent years. Since 2011, when commodity prices of REs had met their all-time maximum, prices have dropped rapidly by more than 90 %. An economic process able to offset these fluctuations has to take unconventional methods into account beside well-known strategies like acid/basic leaching or solvent extraction. The solid-state chlorination provides such an unconventional method for mobilizing RE elements from waste streams. Instead of hydrochloric acid this kind of chlorination decomposes NH4Cl thermally to release up to 400 °C hot HCl gas. After cooling the resulting solid metal chlorides may be easily dissolved in pH-adjusted water. Without producing strongly acidic wastes and with NH4Cl as cheap source for hydrogen chloride, solid-state chlorination provides various advantages in terms of costs and disposal. In the course of the SepSELSA project this method was examined, adjusted and optimized for RE recycling from fluorescent lamp scraps as well as Fe14Nd2B magnets. Thereby many surprising influences and trends required various analytic methods to examine the reasons and special mechanisms behind them.

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참고문헌 (66)

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상세보기
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상세보기
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Method for recovering rare-earth elements from a solid mixture containing a halophosphate and a compound of one or more rare-earth elements
Resource recovery from Nd-Fe-B sintered magnet by hydrothermal treatment 1382 J Alloys Compd 408-412 2006
Verordnung EG Nr EG 245 2009
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Umicore Battery Recycling: Recycling of NiMH and Li-ion batteries 2011
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상세보기
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Recycling of Rare Earth Elements 원문보기

Abstract

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참고문헌 (66)

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