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Article

Distribution Kinetics of Rare Earth Elements in Copper Smelting

1
Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland
2
Geological Survey of Finland, Vuorimiehentie 2, 02150 Espoo, Finland
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(1), 208; https://doi.org/10.3390/su12010208
Received: 30 November 2019 / Revised: 19 December 2019 / Accepted: 20 December 2019 / Published: 25 December 2019
(This article belongs to the Special Issue Sustainable Development and Recycling of Rare Earth Resources)
The use of rare earth elements (REEs) is increasing, mainly due to the growing demand for electric vehicles and new applications in green technology. This results in annual growth of the in-use REE stocks and the amount of End-of-Life (EoL) products containing REEs. REEs are considered critical elements by the EU, mainly because the rest of the world is dependent on China’s supply. Recycling of REEs can help alleviate the criticality of REEs, however, no REEs are currently functionally recycled. In this study, the time-dependent behavior of REEs in copper matte-slag system in primary copper smelting conditions was investigated experimentally at a laboratory scale. Lanthanum and neodymium were chosen to represent all REEs, as they are generally found in the highest concentrations in EoL products, and because REEs all have similar chemical behavior. The experiments were conducted as a function of time in air and argon atmospheres. SEM-EDS, EPMA and LA-ICP-MS methods were used for sample characterization. The results of this work indicate that the REEs strongly favor the slag and the deportment to the slag begins almost instantly when the system reaches high temperatures. With increasing contact times, the REEs distribute even more strongly into the slag phase, where they may be recovered and recycled, if their concentrations are sufficiently high and a suitable hydrometallurgical process can be found. View Full-Text
Keywords: flash smelting; REE; lanthanum; neodymium; kinetics; LA-ICP-MS flash smelting; REE; lanthanum; neodymium; kinetics; LA-ICP-MS
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MDPI and ACS Style

Klemettinen, L.; Aromaa, R.; Dańczak, A.; O’Brien, H.; Taskinen, P.; Jokilaakso, A. Distribution Kinetics of Rare Earth Elements in Copper Smelting. Sustainability 2020, 12, 208. https://doi.org/10.3390/su12010208

AMA Style

Klemettinen L, Aromaa R, Dańczak A, O’Brien H, Taskinen P, Jokilaakso A. Distribution Kinetics of Rare Earth Elements in Copper Smelting. Sustainability. 2020; 12(1):208. https://doi.org/10.3390/su12010208

Chicago/Turabian Style

Klemettinen, Lassi, Riina Aromaa, Anna Dańczak, Hugh O’Brien, Pekka Taskinen, and Ari Jokilaakso. 2020. "Distribution Kinetics of Rare Earth Elements in Copper Smelting" Sustainability 12, no. 1: 208. https://doi.org/10.3390/su12010208

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