Enhanced gallium and germanium recovery from zinc pressure leachate via zinc powder cementation

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-07-26 DOI:10.1016/j.hydromet.2025.106549

Dongfeng Zhou , Shuai Rao , Xingbin Li , Niangao Teng , Zhigan Deng , Hongyang Cao , Dongxing Wang , Zhiyuan Ma , Zhiqiang Liu

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引用次数: 0

Abstract

Industrial extraction of Ga and Ge from zinc concentrate has been achieved; however, their recoveries remain relatively low because of dispersion during various procedures. This study thoroughly investigated the distribution behavior and precipitation mechanism of Ga and Ge from zinc pressure leachate into refinery residue. Process mineralogical investigations demonstrated that Ga primarily precipitated through the formation of jarosite, while Ge enrichment was driven by reduction using zinc powder. Controlling the terminal acidity within the range of 6.0–7.0 g/L during pre-neutralization effectively minimized jarosite formation, thereby reducing Ga loss to below 2.0 mg/L. The cementation process was further improved by introducing secondary zinc oxide, followed by zinc powder in a sequential manner. Strategic adjustment of the pH profile—beginning at 1.9–2.1 and concluding at 3.0–3.5—led to residual Ga and Ga concentrations of less than 2.0 mg/L and 1.0 mg/L, respectively. These conditions enabled production trials to achieve recovery efficiencies above 85 % for Ga and over 96 % for Ge.

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锌粉胶结法提高锌压渗滤液中镓锗的回收率

从锌精矿中实现了镓和锗的工业提取；然而，由于在各种程序中的分散，它们的回收率仍然相对较低。研究了锌压渗滤液中Ga和Ge在炼油厂废渣中的分布行为和沉淀机理。工艺矿物学研究表明，Ga主要通过黄钾铁矾的形成沉淀，而Ge的富集则是由锌粉的还原作用驱动的。在预中和过程中，将终端酸度控制在6.0 ~ 7.0 g/L范围内，可以有效地减少黄钾铁矾的形成，从而将Ga损失降低到2.0 mg/L以下。通过引入二次氧化锌，再依次引入锌粉，进一步改进了胶结工艺。战略性地调整pH分布（从1.9-2.1开始，到3.0 - 3.5结束）导致残留Ga和Ga浓度分别小于2.0 mg/L和1.0 mg/L。这些条件使得生产试验的回收率达到了85%以上的Ga和96%以上的Ge。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.