Print Email Facebook Twitter Recovery of rare earths from glass polishing waste for the production of aluminium-rare earth alloys Title Recovery of rare earths from glass polishing waste for the production of aluminium-rare earth alloys Author Borra, C.R. (TU Delft (OLD) MSE-1; Indian Institute of Technology Madras) Vlugt, T.J.H. (TU Delft Engineering Thermodynamics) Yang, Y. (TU Delft Team Yongxiang Yang) Spooren, Jeroen (Flemish Institute for Technological Research) Nielsen, Peter (Flemish Institute for Technological Research) Amirthalingam, Murugaiyan (Indian Institute of Technology Madras) Offerman, S.E. (TU Delft Team Erik Offerman) Date 2021 Abstract The circular economy demands waste utilization for the production of high-value products, and this requires the development of novel processing routes. In this study, rare earth (La and Ce) oxides were completely (>99%) recovered from polishing waste by a combined novel reductive acid leaching and alkali treatment process. About 70% of rare earths were dissolved during the first leaching step. The undissolved rare earth compounds are converted to oxides/hydroxides by alkali treatment and dissolved in the acid solution – the 2nd leaching step – for the complete recovery of rare earths. The recovered rare earth oxides were used for producing in-situ high-value Al-La-Ce alloys with fused salt electrolysis. Mechanical properties of our Al-La-Ce alloys are similar to the known high temperature Al-Ce alloys. This development of new alloys by our novel process helps in utilization of both overproduced primary La and Ce oxides as well as La and Ce recovered from polishing waste. Subject Aluminium-rare earth alloyGlass polishing wasteLeachingRare earthsWaste utilization To reference this document use: http://resolver.tudelft.nl/uuid:231389c9-4e9f-4997-b472-d014ec37fb28 DOI https://doi.org/10.1016/j.resconrec.2021.105766 Embargo date 2022-01-05 ISSN 0921-3449 Source Resources, Conservation and Recycling, 174 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2021 C.R. Borra, T.J.H. Vlugt, Y. Yang, Jeroen Spooren, Peter Nielsen, Murugaiyan Amirthalingam, S.E. Offerman Files PDF 1_s2.0_S092134492100375X_main.pdf 5.22 MB Close viewer /islandora/object/uuid:231389c9-4e9f-4997-b472-d014ec37fb28/datastream/OBJ/view