Advances in environmental research

  • 제5권2호
  • /
  • Pages.125-140
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  • 2016
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  • 2234-1722(pISSN)
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  • 2234-1730(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Rare earths from secondary sources: profitability study

  • Innocenzi, Valentina (Department of Industrial Engineering, Information and Economy, University of L'Aquila Via Giovanni Gronchi) ;
  • De Michelis, Ida (Department of Industrial Engineering, Information and Economy, University of L'Aquila Via Giovanni Gronchi) ;
  • Ferella, Francesco (Department of Industrial Engineering, Information and Economy, University of L'Aquila Via Giovanni Gronchi) ;
  • Veglio, Francesco (Department of Industrial Engineering, Information and Economy, University of L'Aquila Via Giovanni Gronchi)
  • 투고 : 2016.07.21
  • 심사 : 2016.09.30
  • 발행 : 2016.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

The paper is focused on the economic analysis of two hydrometallurgical processes for recovery of yttrium and other rare earth elements (REEs) from fluorescent phosphors of spent lamps. The first process includes leaching with sulphuric acid and precipitation of a mixture of oxalates by oxalic acid, the second one includes leaching with sulphuric acid, solvent extraction with D2EHPA, stripping by acid and recovery of yttrium and traces of other rare earths (REs) by precipitation with oxalic acid. In both cases the REEs were recovered as oxides by calcination of the oxalate salts. The economic analysis was estimated considering the real capacity of the HydroWEEE mobile's plant ($420kg\;batch^{-1}$). For the first flow-sheet the cost of recycling comes to $4.0{\euro}kg^{-1}$, while the revenue from the end-product is around $5.40{\euro}kg^{-1}$. The second process is not profitable, as well as the first one, taking into account the composition of the final oxides: the cost of recycling comes to $5.2{\euro}kg^{-1}$, while the revenue from the end-product is around $3.56{\euro}kg^{-1}$. The process becomes profitable if the final RE oxide mixture is sold for nearly $50{\euro}kg^{-1}$, a value rather far from the current market prices but not so unlikely since could be achieved in the incoming years, considering the significant fluctuations of the Res' market.

키워드

참고문헌

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피인용 문헌

  1. Treatment of WEEE industrial wastewaters: Removal of yttrium and zinc by means of micellar enhanced ultra filtration 2017, https://doi.org/10.1016/j.wasman.2017.12.018
  2. Secondary yttrium from spent fluorescent lamps: Recovery by leaching and solvent extraction vol.168, 2017, https://doi.org/10.1016/j.minpro.2017.09.017