The advanced treatment of zinc leaching residue (ZLR) is of significance for carbon reduction and sustainable development of zinc smelting industry. Herein, a fast and sufficient hydrometallurgical extraction of metals from zinc leaching residue under mild conditions was proposed via application of metal copper. The results showed that 85.07 % Cu, 97.20 % Cd, 95.05 % As, 96.65 % Mn, 95.86 % In, and 96.81 % Co in ZLR were leached, with Pb and Ag enriched in the residue by over 4 times. Copper powder in the leaching solution enhanced the acid dissolution of zinc ferrite in ZLR. More than 90 % of zinc was extracted within 15 min at 80 ℃, 20 min at 70 ℃, or 40 min at 60 ℃ under the optimal leaching conditions: n(Cu)/n(ZnFeO) = 1, 500 g/L HSO, and 4 mL/g. In addition, copper cemented by zinc powder was reused in the leaching process of ZLR and showed good performance. The proposed copper-assisted leaching process of ZLR was advanced in productivity, the metal recycling rate, and facilities. This study provided an alternative for the treatment of ZLR without use of coal, hopefully contributing to the carbon reduction in zinc smelters.

中文翻译：

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应用铜从锌浸出残渣中充分提取金属：工艺优化和铜的再利用


锌浸渣（ZLR）的深度处理对于锌冶炼行业的碳减排和可持续发展具有重要意义。在此，提出了在温和条件下通过应用金属铜从锌浸出残渣中快速、充分地湿法冶金提取金属。结果表明，ZLR中85.07% Cu、97.20% Cd、95.05% As、96.65% Mn、95.86% In和96.81% Co被浸出，残渣中Pb和Ag富集超过4倍。浸出液中的铜粉增强了ZLR中铁酸锌的酸溶解。在最佳浸出条件：n(Cu)/n(ZnFeO)=1、500 g/L HSO下，80 ℃ 15 min、70 ℃ 20 min、60 ℃ 40 min 锌提取率超过 90%和 4 毫升/克。此外，锌粉胶结的铜在ZLR的浸出过程中得到重复使用，并表现出良好的性能。所提出的 ZLR 铜辅助浸出工艺在生产率、金属回收率和设施方面均取得了进步。这项研究提供了一种不使用煤炭处理 ZLR 的替代方案，有望有助于锌冶炼厂的碳减排。