Rare-earth elements in the circular economy: The case of yttrium.

This paper discusses the economic rationale of recycling exhaustible raw materials and assesses how a circular economy perspective can improve the sustainable use of critical raw materials (CRMs). We use the case study of yttrium, a rare-earth element (REE) on the EU list of CRMs, given its widespread use in the electronics industry and the geopolitical concentration of its supply. Even if recycling REEs from waste electric and electronic equipment is a valid alternative to extraction from mines, as proposed by the circular economy paradigm, less than 1% of REEs used today are recycled. Nevertheless, studies on the economic benefits of recovery REEs are very limited. In this paper, we present the business case of an Italian recycling company, Relight Ltd., and its HydroWEEE project, to recycle REEs such as yttrium, from spent lamps. In environmental terms, recycling REEs has a much lower impact than their extraction from virgin source. In economic terms, it is profitable to recycle yttrium if its market price is above 14€/kg, and above 9.54€/kg taking in consideration the external costs of mining. Therefore, in 2012 and 2013, recycling was profitable thanks to the high price of yttrium, while between 2014 and 2016 recycling was not cost effective. In these cases, policymakers must incentivize recovery and recycling solutions with appropriate policies.

[1]  F. Ferella,et al.  Treatment of exhaust fluorescent lamps to recover yttrium: experimental and process analyses. , 2011, Waste management.

[2]  A. Hu,et al.  Carbon footprint assessment of recycling technologies for rare earth elements: A case study of recycling yttrium and europium from phosphor. , 2015, Waste management.

[3]  F. Ferella,et al.  Rare earths from secondary sources: profitability study , 2016 .

[4]  L. Pietrelli,et al.  Application of solvent extraction operation to recover rare earths from fluorescent lamps , 2018 .

[5]  K. R. Long,et al.  Rare-earth elements , 2017 .

[6]  Ling He,et al.  Study on alkali mechanical activation for recovering rare earth from waste fluorescent lamps , 2018 .

[7]  F Vegliò,et al.  Recovery of yttrium from cathode ray tubes and lamps' fluorescent powders: experimental results and economic simulation. , 2013, Waste management.

[8]  H. Hotelling.  The Economics of Exhaustible Resources , 1931, Journal of Political Economy.

[9]  G. Mudd,et al.  Recycling of the rare earth elements , 2018, Current Opinion in Green and Sustainable Chemistry.

[10]  F. Medici,et al.  A hydrometallurgical process for the recovery of terbium from fluorescent lamps: Experimental design, optimization of acid leaching process and process analysis. , 2016, Journal of environmental management.

[11]  Gérard Gaudet.  Natural Resource Economics Under the Rule of Hotelling , 2007 .

[12]  Saleem H Ali,et al.  Sustainability of the Rare Earths Industry , 2014 .

[13]  Bernd Kopacek,et al.  Environmental impact assessment of hydrometallurgical processes for metal recovery from WEEE residues using a portable prototype plant. , 2013, Environmental science & technology.

[14]  Qijun Zhang,et al.  The recycling of rare earths from waste tricolor phosphors in fluorescent lamps: A review of processes and technologies , 2014 .

[15]  Alessandra Cesaro,et al.  Bioleaching of metals from WEEE shredding dust. , 2018, Journal of environmental management.

[16]  Antonio Massarutto,et al.  The long and winding road to resource efficiency – An interdisciplinary perspective on extended producer responsibility , 2014 .

[17]  J. Bai,et al.  Improvement in rare earth element recovery from waste trichromatic phosphors by mechanical activation , 2017 .

[18]  M. Hekkert,et al.  Conceptualizing the Circular Economy: An Analysis of 114 Definitions , 2017 .

[19]  K. Vatalis,et al.  Rare Earth Elements: Industrial Applications and Economic Dependency of Europe☆ , 2015 .

[20]  F. Medici,et al.  Rare earth elements recovery from fluorescent lamps: A new thermal pretreatment to improve the efficiency of the hydrometallurgical process , 2017 .

[21]  Qing Chang,et al.  The tremendous potential of deep-sea mud as a source of rare-earth elements , 2018, Scientific Reports.

[22]  Helmut Mischo,et al.  Strategic evaluations and mining process optimization towards a strong global REE supply chain , 2016, Journal of Sustainable Mining.

[23]  Thomas Hamacher,et al.  Nonregenerative natural resources in a sustainable system of energy supply. , 2012, ChemSusChem.

[24]  B. Kopacek,et al.  Recovery of yttrium from fluorescent powder of cathode ray tube, CRT: Zn removal by sulphide precipitation. , 2013, Waste management.

[26]  Antonio Nieto,et al.  An economics strategy for criticality – Application to rare earth element Yttrium in new lighting technology and its sustainable availability , 2017 .

[27]  Ernst Worrell,et al.  Mineral resources: Geological scarcity, market price trends, and future generations , 2016 .

[28]  T. Graedel,et al.  Challenges in Metal Recycling , 2012, Science.

[29]  Nabeel A. Mancheri,et al.  World trade in rare earths, Chinese export restrictions, and implications , 2015 .

[30]  Tom Van Gerven,et al.  Recycling of rare earths: a critical review , 2013 .

[31]  Tom Van Gerven,et al.  Towards zero-waste valorisation of rare-earth-containing industrial process residues: a critical review , 2015 .

[32]  Zhongxue Li,et al.  Evaluation of Externalities Associated with Rare Earth Exploitation at Bayan Obo , 2017 .

[33]  S. Ulgiati,et al.  A review on circular economy: the expected transition to a balanced interplay of environmental and economic systems , 2016 .

[34]  Jhy-Chern Liu,et al.  Extraction of yttrium and europium from waste cathode-ray tube (CRT) phosphor by subcritical water , 2018 .

[35]  E. Hultink,et al.  The Circular Economy - A New Sustainability Paradigm? , 2017 .

[36]  Patrice Christmann,et al.  STRENGTHENING THE EUROPEAN RARE EARTHS SUPPLY-CHAIN Challenges and policy options A REPORT BY THE EUROPEAN RARE EARTHS COMPETENCY NETWORK (ERECON) , 2015 .

[37]  Zhanheng Chen,et al.  Global rare earth resources and scenarios of future rare earth industry , 2011 .

[38]  I. D. Michelis,et al.  Design and construction of an industrial mobile plant for WEEE treatment: Investigation on the treatment of fluorescent powders and economic evaluation compared to other e-wastes , 2017 .

[39]  R. Ganguli,et al.  Rare earths: A review of the landscape , 2018 .

[40]  F. Ferella,et al.  Secondary yttrium from spent fluorescent lamps: Recovery by leaching and solvent extraction , 2017 .

[41]  Bernd Kopacek,et al.  Yttrium recovery from primary and secondary sources: a review of main hydrometallurgical processes. , 2014, Waste management.

[42]  K. Vatalis,et al.  Environmental Defects And Economic Impact On Global Market Of Rare Earth Metals , 2016 .

[43]  A. Fortuny,et al.  Rare earths separation from fluorescent lamp wastes using ionic liquids as extractant agents. , 2018, Waste management.