Copper leaching from water-quenched slag using an ethylenediamine-enhanced ammonia leaching system

IF 6.3 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2026-01-01 Epub Date: 2025-11-11 DOI:10.1016/j.hydromet.2025.106608

Jianjun Sun , Tianfu Zhang , Peilun Shen , Dianwen Liu

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引用次数: 0

Abstract

Large quantities of copper-rich water-quenched slag (WQS) are generated during copper smelting. However, the efficient recovery of copper from WQS faces significant challenges, resulting in extensive stockpiling of WQS in slag yards for extended periods without prior copper recovery. This not only causes resource waste but also poses potential environmental pollution risks. To achieve efficient copper recovery from WQS, this study innovatively incorporates ethylenediamine (EDA) into the WQS ammonia leaching system—EDA acts as a bidentate ligand that not only exhibits strong coordination ability with copper ions but also forms stable and highly soluble complexes with them.

This study employed process mineralogy, single-factor experiments, response surface methodology (RSM), and thermodynamic analyses to characterize WQS mineralogical properties, identify factors influencing copper leaching efficiency, determine the significance order of the effects of individual factors and interactions between different factors on copper leaching efficiency, and clarify the mechanism of EDA-enhanced leaching. The results demonstrated that EDA addition enhanced copper leaching efficiency from 90.5 % to 93.2 %. The RSM analysis indicated that the significance order of the effects of individual factors and interactions between different factors on copper leaching efficiency is (NH₄)₂S₂O₈ > EDA > NH₃ and (NH₄)₂S₂O₈–EDA > (NH₄)₂S₂O₈–NH₃ > NH₃–EDA, respectively. The leaching mechanism analysis revealed that the core reason for EDA-enhanced copper leaching is as follows: the [Cu(EDA)₂]²⁺ complexes formed by EDA and copper ions exhibit significantly higher stability than the [Cu(NH₃)₄]²⁺ complexes. This stability difference facilitates the dissolution of copper from the solid phase into the leaching solution, thereby improving copper leaching efficiency. This study provides an alternative method for large-scale utilization of WQS.

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用乙二胺强化氨浸系统从水淬渣中浸出铜

铜冶炼过程中会产生大量富铜水淬渣。然而，从废渣中有效回收铜面临着重大挑战，导致废渣在没有事先回收铜的情况下长期大量储存在渣场。这不仅会造成资源浪费，还会带来潜在的环境污染风险。为了从WQS中高效回收铜，本研究创新性地将乙二胺（EDA）加入到WQS氨浸体系中。EDA作为双齿配体，不仅与铜离子具有较强的配位能力，而且与铜离子形成稳定的高溶配合物。本研究采用工艺矿物学、单因素实验、响应面法（RSM）和热力学分析等方法表征WQS矿物学性质，识别影响铜浸出效率的因素，确定各因素对铜浸出效率的影响程度及各因素之间的相互作用顺序，明确eda强化浸出的机理。结果表明，添加EDA可使铜浸出率从90.5%提高到93.2%。RSM分析表明，各因素对铜浸出效率影响的显著性顺序为（NH₄）₂S₂O₈> EDA >； NH₃和（NH₄）₂S₂O₈-EDA > （NH₄）₂S₂O₈-NH₃> NH₃-EDA。浸出机理分析表明，EDA增强铜浸出的核心原因是EDA与铜离子形成的[Cu(EDA)2]2+配合物的稳定性明显高于[Cu(NH3)4]2+配合物。这种稳定性差异有利于铜从固相溶解到浸出液中，从而提高铜的浸出效率。本研究为大规模利用WQS提供了另一种方法。

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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.