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Open AccessArticle

Valorization of Rare Earth Elements from a Steenstrupine Concentrate Via a Combined Hydrometallurgical and Pyrometallurgical Method

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Hangzhou Water Technology Co., Ltd., Kejiguan Street 1600, Binjiang District, Hangzhou 310051, China
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IME Process Metallurgy and Metal Recycling, Intzestrasse 3, 52056 Aachen, Germany
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Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 248; https://doi.org/10.3390/min10030248
Received: 30 December 2019 / Revised: 2 March 2020 / Accepted: 5 March 2020 / Published: 9 March 2020
(This article belongs to the Special Issue Advances in Valorization of Valuable Metals)
Due to their unique characteristics, Lanthanides series (15 elements) together with scandium and yttrium are used as critical metals in numerous applications such as energy sources, catalysts, hybrid cars, medical technology, and military industry. The significance of rare earth elements has been continuously increasing because the global demand for producing high-tech devices is continuously rising. The recovery of rare earth oxide from concentrate based on eudialyte and steenstrupine was performed using a hydrometallurgical and pyrometallurgical method. Eudialyte and steenstrupine are a complex Na-Ca-zirconosilicate mineral containing rare earth elements (REEs), Zr, Hf and Nb, thus serving as a potential source of Zr. Because of the presence of silica in eudialyte, the main challenge in its processing is avoiding silica gel formation, which is an unfilterable solid residue. The influence of leaching temperature, time and solid–liquid ratio on leaching efficiency was studied in laboratory conditions. A new research strategy was developed in order to recover rare earth elements using hydrochloric acid, avoiding silica gel formation. View Full-Text
Keywords: rare earth elements; leaching; silica gel; hydrometallurgy; pyrometallurgy rare earth elements; leaching; silica gel; hydrometallurgy; pyrometallurgy
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MDPI and ACS Style

Yun, Y.; Stopic, S.; Friedrich, B. Valorization of Rare Earth Elements from a Steenstrupine Concentrate Via a Combined Hydrometallurgical and Pyrometallurgical Method. Minerals 2020, 10, 248.

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