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Near-zero-waste processing of low-grade, complex primary ores and secondary raw materials in Europe: technology development trends

Spooren Jeroen, Binnemans Koen, Björkmalm Johanna, Breemersch Koen, Dams Yoko, Folens Karel, González-Moya María, Horckmans Liesbeth, Komnitsas Konstantinos, Kurylak Witold, Lopez Maria, Mäkinen Jarno, Onisei Silviana, Oorts Koen, Peys Arne, Pietek Grzegorz, Pontikes Yiannis, Snellings Ruben, Tripiana María, Varia Jeet, Willquist Karin, Yurramendi Lourdes, Kinnunen Päivi

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Year 2020
Type of Item Review
Bibliographic Citation J. Spooren, K. Binnemans, J. Björkmalm, K. Breemersch, Y. Dams, K. Folens, M. González-Moya, L. Horckmans, K. Komnitsas, W. Kurylak, M. Lopez, J. Mäkinen, S. Onisei, K. Oorts, A. Peys, G. Pietek, Y. Pontikes, R. Snellings, M. Tripiana, J. Varia, K. Willquist, L. Yurramendi, and P. Kinnunen, “Near-zero-waste processing of low-grade, complex primary ores and secondary raw materials in Europe: technology development trends,” Resour. Conserv. Recycl., vol. 160, Sep. 2020. doi: 10.1016/j.resconrec.2020.10
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With an increasing number of low-grade primary ores starting to be cost-effectively mined, we are at the verge of mining a myriad of low-grade primary and secondary mineral materials. At the same time, mining practices and mineral waste recycling are both evolving towards sustainable near-zero-waste processing of low-grade resources within a circular economy that requires a shift in business models, policies and improvements in process technologies. This review discusses the evolution towards low-grade primary ore and secondary raw material mining that will allow for sufficient supply of critical raw materials as well as base metals. Seven low-grade ores, including primary (Greek and Polish laterites) and secondary (fayalitic slags, jarosite and goethite sludges, zinc-rich waste treatment sludge and chromium-rich neutralisation sludge) raw materials are discussed as typical examples for Europe. In order to treat diverse and complex low-grade ores efficiently, the use of a new metallurgical systems toolbox is proposed, which is populated with existing and innovative unit operations: (i) mineral processing, (ii) metal extraction, (iii) metal recovery and (iv) matrix valorisation. Several promising novel techniques are under development for these four unit-operations. From an economical and environmental point of view, such processes must be fitted into new (circular) business models, whereby impacts and costs are divided over the entire value chain. Currently, low-grade secondary raw material processing is only economic and environmentally beneficial when the mineral residues can be valorised and landfill costs are avoided and/or incentives for waste processing can be taken into account.

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