Process Optimization and Leaching Behavior of Copper in Oxidation Leaching Spent Silicon Contact in Sulfuric Acid Systems

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-06-23 DOI:10.1007/s12633-025-03362-z

Xiaoyi Yao, Dandan Wu, Chong Chen, Yuxuan Tian, Xingwei Yang

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引用次数: 0

Abstract

The current silicone industry is in a stage of rapid development, but the problem is that in the process of its development, a lot of silicone waste contacts have been generated, and the generation of this problem shows that there is a waste of resources. The rational utilization of organic silicon waste contacts which contains silicon and copper restricts the development of organic silicon industry. In consideration of the limited copper resources, it is of great significance to recover copper from the waste contacts. In this study, sodium hypochlorite was adopted as an oxidant to leach copper from spent silicon contacts under sulfuric acid system, and the leaching mechanism was studied in detail by various characterization methods (SEM–EDS, XPS, AFM), and kinetic analysis was also conducted. The effects of sodium hypochlorite concentration, sulfuric acid concentration, temperature and solid–liquid ratio on copper leaching efficiency were studied by two-factor experiments with time addition, and the leaching process was optimized. The experimental results show that the oxidative acid leaching method of sodium hypochlorite combined with sulfuric acid is more efficient and feasible than that of single sulfuric acid leaching, and the copper leaching rate reaches 97.55%, which is due to the fact that sodium hypochlorite will reduce the production of copper element. This study provides the feasibility of a new oxidant application for the recycling of waste silicon contact copper, which will facilitate the sustainable development of the silicone industry.

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硫酸体系氧化浸出废硅接触中铜的工艺优化及浸出行为

目前硅胶行业正处于快速发展的阶段，但问题是在其发展的过程中，产生了大量的硅胶废接点，这个问题的产生说明存在着资源的浪费。含硅、铜的有机硅废触头的合理利用制约着有机硅工业的发展。考虑到铜资源有限，从废触头中回收铜具有重要意义。本研究以次氯酸钠为氧化剂，在硫酸体系下从废硅触头中浸出铜，并通过SEM-EDS、XPS、AFM等多种表征方法对浸出机理进行了详细研究，并进行了动力学分析。通过双因素试验研究了次氯酸钠浓度、硫酸浓度、温度和料液比对铜浸出效率的影响，并对浸出工艺进行了优化。实验结果表明，次氯酸钠与硫酸联合氧化酸浸比单一硫酸氧化酸浸更有效可行，铜的浸出率达到97.55%，这是由于次氯酸钠会降低铜元素的生成。本研究为废硅接触铜的回收利用提供了一种新的氧化剂应用的可行性，将有利于有机硅工业的可持续发展。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.