使用 D301 阴离子交换树脂和硫脲洗脱从 TCCA 的氯化物浸出液中回收黄金

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Huiqun Niu , Hongying Yang , Linlin Tong
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引用次数: 0

摘要

用于金浸出的三氯异氰尿酸(TCCA)因其毒性低、效率高而成为氰化法的替代品。本研究调查了使用 D301 树脂从高效氯化物浸出液中回收金的程序。这种方法避免了使用活性炭时对金吸附的抑制。研究讨论了金吸附的最佳条件,包括建立吸附动力学和等温线,以及计算吸附活化能。此外,还利用扫描电子显微镜(SEM)、傅立叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)技术揭示了 D301 树脂吸附金的机理。在最佳条件下(pH 值 4.0、温度 25 °C、时间 120 分钟),平均吸附率达到 99.2%。对吸附数据的分析表明,金的吸附遵循伪二阶动力学模型和 Freundlich 吸附等温线。计算得出的活化能为 9.69 kJ mol-1,这表明 D301 树脂珠中的质子化叔胺基团主要是通过离子交换反应进行物理吸附。此外,在解吸实验中测试的各种洗脱液中,含有硫脲和盐酸混合物的溶液(浓度分别为 0.4 mol L-1 和 0.8 mol L-1)表现出更高的效率,在 80 分钟内解吸成功率达到 95.7 ± 0.3%。经过三个树脂再生周期后,再生效率达到 91.2%,平均吸附率保持在 95.3%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gold recovery from chloride leach solution of TCCA using D301 anion exchange resin and elution with thiourea

Trichloroisocyanuric acid (TCCA), which is used for gold leaching, is an alternative to cyanidation due to its lower toxicity and higher efficiency. This study investigated the gold recovery procedures from highly effective chloride leaching solution using the D301 resin. This approach prevented the inhibition of gold adsorption when using activated carbon. Herein, the optimal conditions for gold adsorption were discussed, including establishing adsorption kinetics and isotherms, and calculating adsorption activation energy. Additionally, SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infrared Spectroscopy), and XPS (X-ray Photoelectron Spectroscopy) techniques were used to reveal the mechanism of gold adsorption using D301 resin. Under optimal conditions (pH 4.0, temperature 25 °C, time 120 min), an average adsorption percentage of 99.2% was achieved. Analysis of the adsorption data confirmed that gold adsorption followed the pseudo-second-order kinetic model and Freundlich adsorption isotherm. The calculated activation energy was 9.69 kJ mol−1, indicating a predominance of physical adsorption involving ion exchange reactions with protonated tertiary amine groups in the D301 resin beads. Furthermore, among various eluents tested in desorption experiments, a solution containing a mixture of thiourea and hydrochloric acid with 0.4 mol L−1 and 0.8 mol L−1, respectively, demonstrated superior efficiency, achieving a successful desorption percentage reaching 95.7 ± 0.3% within 80 min. After three cycles of resin regeneration, the regeneration efficiency reached 91.2% while maintaining an average adsorption percentage of 95.3%.

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来源期刊
Hydrometallurgy
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.
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