Leaching of Mine Tailings Flotation Fractions Using Inorganic and Organic Acids for Metals Extraction

A novel approach to metal recovery from mine tailings demonstrates that citric acid can efficiently extract lead (Pb) with up to 86% efficiency, outperforming inorganic acids like sulfuric acid. This study, focusing on the Bollrich tailings pond at Rammelsberg's historic mining site, also shows that while sulfuric acid is effective for copper (Cu) and zinc (Zn), sequential leaching processes are necessary to maximize metal recovery due to inhibitory effects of sulfate compounds. The research highlights citric acid as a promising lixiviant for Pb across different tailing types, with potential co-extraction benefits for Cu and Zn, offering a sustainable solution for managing legacy mine waste and mitigating environmental contamination.

Azevedo Schueler, T., Mettke, L. N., Crutziger, F., Rasenack, K., Yagmurlu, B., & Goldmann, D. (2025). Leaching of Mine Tailings Flotation Fractions Using Inorganic and Organic Acids for Metals Extraction. Journal of Sustainable Metallurgy, 11(3), 3014–3030. https://doi.org/10.1007/s40831-025-01180-6