Sustainable recycling of titanium scraps and purity titanium production via molten salt electrolysis
Sustainable recycling of titanium scraps and purity titanium production via molten salt electrolysis
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DOI：
10.1016/j.jclepro.2020.121314
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发表时间：
2020-07-10
影响因子：
11.1
通讯作者：
Fang, Daining
中科院分区：
文献类型：
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作者：
Jiao, Handong;Song, Wei-Li;Fang, Daining
钛资源在地壳中储量丰富，具有许多优异的性能，但钛的大规模应用一直受到生产成本高和利用率低两大关键挑战的制约。目前，冶金学家非常重视开发新的提取工艺来实现这一目标。然而，钛的可持续回收目前受到的关注要少得多。在这里，我们开发了一种熔盐电解技术，用于高质量回收钛废料。选择TC4（Ti6Al4V）废料作为代表性钛合金，研究熔盐电解中的分离效果。值得注意的是，降低阳极电流密度可以抑制TC4合金中钒元素的阳极溶解。因此，可以从阳极泥中收集高价的钒金属粉末。 TC4合金阳极中的铝元素可以以Al离子的形式溶解到电解液中，然后通过优化电解液含量和电解参数保留在电解液中。最后，可以从阴极收集高纯度钛。因此，这项工作对于钛的可持续再循环乃至整个钛工业都具有重要意义，因为钛废料将转化为高品位钛金属和其他高价金属。 (C) 2020 Elsevier Ltd. 保留所有权利。
Titanium resources, with many outstanding properties, is abundant in the earth's crust, while large-scale application of titanium has been substantially restricted by two key challenges, i.e. high production cost and low utilization. Currently, metallurgists have paid great attention to develop a new extraction process for achieving the goal. However, the sustainable recycling of titanium currently receives far less attention. Here, we develop a molten salt electrolysis for the high-quality recycling of titanium scarps. TC4 (Ti6Al4V) scrap, as a representative titanium alloy, is selected to investigate the separation effect in the molten salt electrolysis. Remarkably, anodic dissolution of the vanadium element in the TC4 alloy could be inhibited by decreasing anodic current density. Therefore, high priced vanadium metal powder could be collected from the anodic mud. Aluminum element in the TC4 alloy anode can dissolve into electrolyte in the form of Al ions, and then remains in the electrolyte via optimizing the electrolyte contents and electrolysis parameters. Finally, high purity titanium could be collected from the cathode. Consequently, this work is significant for the titanium sustainable recirculation or even the entire titanium industry because the titanium scraps will be converted into the high-grade titanium metal and other high priced metals. (C) 2020 Elsevier Ltd. All rights reserved.