| Title | Recovery of rare earths from glass polishing waste for the production of aluminium-rare earth alloys |
|---|---|
| ID_Doc | 7744 |
| Authors | Borra, CR; Vlugt, TJH; Yang, YX; Spooren, J; Nielsen, P; Amirthalingam, M; Offerman, SE |
| Title | Recovery of rare earths from glass polishing waste for the production of aluminium-rare earth alloys |
| Year | 2021 |
| Published | |
| 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. |
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