Extraction of Se and Te from copper anode slime through pressure oxidation, atmospheric H2SO4 leaching and reduction with sulfur dioxide and copper powder

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

Hydrometallurgy Pub Date : 2025-08-27 DOI:10.1016/j.hydromet.2025.106568

Shuai Rao , Dongxing Wang , Hongyang Cao , Wei Zhu , Lijuan Duan , Zhiqiang Liu , Zhiyuan Ma

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引用次数: 0

Abstract

Conventional H₂SO₄ pressure leaching of copper anode slime exhibits limited selenium extraction efficiency owing to the undesirable precipitation of elemental selenium. To address this challenge, this study developed an innovative sequential process combining hydrothermal phase transformation, atmospheric H₂SO₄ leaching and stepwise reduction. Thermodynamic analysis using E-pH diagrams revealed the dissolution pathways: Cu₂Se underwent stepwise transformation into soluble H₂SeO₃ via an intermediate CuSeO₃·2H₂O phase, whereas tellurium species evolved from Cu₂Te to Te(OH)₃⁺ through TeO₂ intermediates. Under optimal conditions, the integrated hydrothermal conversion-atmospheric leaching process achieved extraction efficiencies of 98.9 % Cu, 98.3 % Se, and 94.8 % Te. Subsequent recovery of selenium and tellurium from the resulting leachate employed stepwise reduction and purification, yielding final products with purities of 98.4 wt% Se and 99.1 wt% Te, respectively.

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加压氧化、常压H2SO4浸出、二氧化硫和铜粉还原从铜阳极泥中提取Se和Te

常规H2SO4压力浸出铜阳极泥的硒提取效率有限，主要原因是元素硒的析出不理想。为了解决这一挑战，本研究开发了一种结合水热相变、大气H2SO4浸出和逐步还原的创新顺序工艺。利用E-pH图的热力学分析揭示了Cu2Se通过中间相CuSeO3·2H2O逐步转化为可溶的H2SeO3，而碲则通过中间相TeO2从Cu2Te进化为Te(OH)3+。在最优条件下，水热转化-大气浸出一体化工艺的Cu、Se、Te提取率分别为98.9%、98.3%和94.8%。随后从所得渗滤液中回收硒和碲，采用逐步还原和净化，最终产品的硒纯度分别为98.4% wt%和99.1% wt% Te。

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.