Extraction of gallium and indium from zinc refinery residue (ZRR) has continued to attract attention because of different mineralogy of residues and occurrences of trace elements in ZRR. About 90% of gallium is currently extracted from Bayer liquor, whereas, ZRR has been a primary source for indium recovery. The primary production of gallium and indium in USA is currently zero. However, zinc residues are a promising resource for the extraction of critical metals such as gallium, germanium and indium. The major problem in ZRR is the concentration of zinc ferrite (ZF) which is refractory to leaching. The current study introduces a method to enhance the leaching kinetics of ZRR having ZF as major constituent. In this study, ZF was partially reduced with reducing gas containing 10% H₂ and the roasting product was then leached under different conditions. The effect of reduction roasting was found to have a significant impact on the leaching kinetics of ZRR. The decomposition of ZF eased the leaching of zinc, gallium and indium. More than 90% extraction of the target elements was achieved with this process. The manuscript also discusses the characterization of ZRR using laser ablation inductively coupled plasma-mass spectrometry (LA ICP-MS), scanning electron microscopy (SEM), x-ray diffraction (XRD) and automated mineralogy.

从锌精炼残渣 (ZRR) 中提取镓和铟一直受到关注，因为 ZRR 中残渣的矿物学不同和微量元素的存在。目前大约 90% 的镓是从拜耳液中提取的，而 ZRR 一直是铟回收的主要来源。美国镓和铟的初级产量目前为零。然而，锌渣是提取关键金属（如镓、锗和铟）的有前途的资源。ZRR 的主要问题是难以浸出的铁酸锌 (ZF) 的浓度。目前的研究介绍了一种提高以 ZF 为主要成分的 ZRR 浸出动力学的方法。在这项研究中，ZF 被部分还原，还原气体含有 10% H ₂然后在不同条件下浸出焙烧产品。发现还原焙烧的效果对 ZRR 的浸出动力学有显着影响。ZF 的分解减轻了锌、镓和铟的浸出。通过该过程实现了 90% 以上的目标元素提取。手稿还讨论了使用激光烧蚀电感耦合等离子体质谱 (LA ICP-MS)、扫描电子显微镜 (SEM)、X 射线衍射 (XRD) 和自动矿物学对 ZRR 的表征。