PREFACE FOR THEMATIC SECTION: GREEN RARE EARTH ELEMENTS—INNOVATIONS IN ORE PROCESSING, HYDROMETALLURGY, AND ELECTROLYSIS

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PREFACE FOR THEMATIC SECTION: GREEN RARE EARTH ELEMENTS—INNOVATIONS IN ORE PROCESSING, HYDROMETALLURGY, AND ELECTROLYSIS

Rare earth elements (REEs) can be obtained from both natural resources and by recycling. Currently, more than 95 % of the global demand are mined and processed into rare earth metals in China. The demand for REEs for applications in the high-tech sector will increase steadily in the future. Hence, the supply chain of the western industries is entirely dependent on imports. Due to this uncertainty, it is of high economic and social interest to identify alternative supply structures for REEs. The aim of many ongoing research projects around the globe is the identification of new supply chains. In addition, innovative and sustainable methods for their implementation are developed within these projects. While dealing with these issues, it is crucial to consider the superordinate economic, environmental, and social aspects. Currently, the recycling of post-consumer-waste (‘‘old scrap’’) accounts for only 1 % to the supply with REEs. The extent, to which post-production-waste (‘‘new scrap’’) is recycled, is currently not reported. Europe, Japan, and the US are increasing their activities in tapping new primary and secondary resources in order to raise their raw material potential. In order to illustrate the holistic examination that the ongoing research projects have provided so far, this thematic section ‘‘Green REEs—innovations in ore processing, hydrometallurgy and electrolysis’’ in the Journal of Sustainable Metallurgy was launched. The goal of all the research work presented within is the investigation of methods and procedures to ensure the sustainable supply with REEs. The predominantly technically oriented research projects as a whole cover the entire process chain. Topics addressed range from the exploitation of REEs from alternative deposits or by recycling of process waste, to the processing of ores, their extraction, and metallurgical refining and the processing of rare earth metals by electrolysis. Regarding the exploitation of deposits, a structured assessment and evaluation of deposits is examined. Within the research on the mining of REEs, treatment processes enabling the reduction of consumables—especially energy and chemicals—and process wastes for disposal are investigated. Another emphasis within the research of REE mining is the possibility to reduce the risk of accompanying radioactive elements. In addition, the potential for recycling of process waste and post-consumerThe contributing editor for this article was Yiannis Pontikes.

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