Upcycling of Titanium by Molten Salt Electrorefining,ACS Sustainable Chemistry & Engineering

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Upcycling of Titanium by Molten Salt Electrorefining
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-31 , DOI: 10.1021/acssuschemeng.3c00645
Handong Jiao ₁ , Mengjun Liu ₁ , Zhe Wang ₂ , Manpeng Lin ₁ , Zhaoliang Qu ₁ , Jianxun Song ₃ , Shuqiang Jiao ₂

Affiliation

Molten salt electrorefining is expected to be a powerful technology for upcycling titanium scrap because of its robust ability of removing impurities. However, realizing the stable operation of electrorefining, for example, the current efficiency of the anode and the cathode is still a key challenge from the viewpoint of industrial applications. Here, we study titanium’s anodic dissolution and cathodic deposition processes via a direct three-dimensional visualization method based on a computed tomography technology under high-temperature operational conditions. Real-time quantitative results show that the current efficiency is obviously affected by the concentration of titanium ions in the melt. Visual analysis of the local dissolution rate and the curvature of the titanium anode at different electrolysis stages reveals the kinetic origin of the concentration-induced current efficiency changes, which arise from the priority of the side reactions being dependent on the concentration of titanium ions. Finally, we show that employing the high concentration and single existence forms of titanium ions is an effective strategy to prevent the side reactions and improve the current efficiency. This work provides a fresh and fundamental understanding of the side reactions occurring at the interface of electrodes and is significant for facilitating the stability of electrorefining engineering of titanium.

中文翻译：

通过熔盐电解精炼升级回收钛

熔盐电解精炼具有强大的去除杂质的能力，有望成为钛废料升级回收的强大技术。然而，从工业应用的角度来看，实现电解精炼的稳定运行，例如阳极和阴极的电流效率仍然是一个关键挑战。在这里，我们通过基于计算机断层扫描技术的高温操作条件下的直接三维可视化方法研究了钛的阳极溶解和阴极沉积过程。实时定量结果表明，电流效率明显受熔体中钛离子浓度的影响。对不同电解阶段钛阳极的局部溶解速率和曲率的可视化分析揭示了浓度引起的电流效率变化的动力学起源，这是由于副反应的优先级取决于钛离子的浓度。最后，我们表明采用高浓度和单一存在形式的钛离子是防止副反应和提高电流效率的有效策略。这项工作提供了对电极界面发生的副反应的全新和基本的理解，对于促进钛电解精炼工程的稳定性具有重要意义。这是由于副反应的优先级取决于钛离子的浓度。最后，我们表明采用高浓度和单一存在形式的钛离子是防止副反应和提高电流效率的有效策略。这项工作提供了对电极界面发生的副反应的全新和基本的理解，对于促进钛电解精炼工程的稳定性具有重要意义。这是由于副反应的优先级取决于钛离子的浓度。最后，我们表明采用高浓度和单一存在形式的钛离子是防止副反应和提高电流效率的有效策略。这项工作提供了对电极界面发生的副反应的全新和基本的理解，对于促进钛电解精炼工程的稳定性具有重要意义。

更新日期：2023-03-31

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