This study investigates the use of novel alcoholic ammoniacal systems for the extraction of Cu, Zn, and Pb from Fe-rich residue materials as an alternative technology to traditional aqueous ammoniacal extraction. To this purpose, methanol- and ethanol-based ammoniacal solutions were prepared with several ammonium salts (ammonium chloride, -acetate, -carbonate, and -sulfate) and tested for their metal extraction potential (i.e., metal solubility and selectivity) in synthetic systems with metal sulfate salts of Cu, Zn, Pb, and Fe. The obtained metal solubility results were interpreted by modeling the conditions of the different alcoholic ammoniacal systems (NH3 concentration, pH), and used to select the most promising extraction systems. Furthermore, the initial alkalinity of these selected ammoniacal systems was adapted with stoichiometric NaOH additions, which proved to be a determining factor for the NH3 concentration and the pH and, thus, also for the metal solubility and selectivity. Finally, in a case study on the extraction of Cu, Zn, and Pb from a roasted sulfidic tailing, the ammonium acetate NaOH methanol solution and the ammonium chloride methanol solution showed promising metal extraction efficiencies for Zn (> 40%) and Cu (> 27%), while a very low Fe concentration in the extraction solution was assured (< 0.3 mM). These results warrant further research to reveal the full potential of non-aqueous ammoniacal metal extraction.
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The authors would like to thank Wendy Wouters for the microwave-assisted roasting and the extraction experiment with the roasted tailing, Myrjam Mertens for the XRD analysis, Raymond Kemps for the SEM-EDX analysis, and Warre Van Dun for the assistance with the ICP-OES measurements. Nor Kamariah is thankful for the funding from the European Union’s EU Framework Program for Research and Innovation Horizon 2020 under Grant Agreement No 812580 (MSCA-ETN SULTAN). This publication reflects only the authors' view, exempting the Commission from any liability.
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Everaert, M., Guerrero, F., Kamariah, N. et al. Fundamental Insights in Alcoholic Ammoniacal Systems for Selective Solvometallurgical Extraction of Cu, Zn, and Pb from Tailings. J. Sustain. Metall. (2021). https://doi.org/10.1007/s40831-021-00382-y
- Ammoniacal leaching
- Alcoholic extraction systems
- Selective metal leaching
- Sulfidic tailings