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材料导报  2022, Vol. 36 Issue (Z1): 22010043-6    
  金属与金属基复合材料 |
硬质合金废料电解回收钨及W(Ⅵ)在熔盐中的电化学行为
李亮星, 朱志城, 贾孟熹, 黄茜琳
江西理工大学能源与机械工程学院,南昌 330013
Recovery Tungsten from Cemented Carbide Waste by Electrolysis and Electrochemical Behavior of Tungsten Ions in Molten Salts
LI Liangxing, ZHU Zhicheng, JIA Mengxi, HUANG Xilin
School of Energy and Mechanical Engineering,Jiangxi University of Science and Technology, Nanchang 330013, China
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摘要 硬质合金在机械制造等领域应用广泛,产生的硬质合金废料逐年增加,对硬质合金废料进行回收有利于节约资源、保护环境。采用循环伏安技术考察NaCl-KCl-Na2WO4熔盐体系中W(Ⅵ)的电化学行为,利用扫描电镜及X射线衍射技术研究电解电压对硬质合金废料阳极溶解形貌及组织结构变化的影响。结果表明:W(Ⅵ)在NaCl-KCl-Na2WO4熔盐体系中的电化学还原过程是准可逆的,反应受扩散控制,750 ℃时扩散系数为6.252×10-5 cm2·s-1。随着电解电压的增大,硬质合金废料表面形貌由颗粒团絮多孔状转变为蜂窝状,随后表面出现黑色块状物质。通过控制电解电压可以选择性分离回收硬质合金废料中的钨、钴金属,硬质合金废料中的钛优先于钨溶解,增大电压,更换阴极电解可得到纯钨产品。
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李亮星
朱志城
贾孟熹
黄茜琳
关键词:  硬质合金废料  资源回收  钨  熔盐电解  电化学行为    
Abstract: Cemented carbide is widely used, prodcing an increasing number of waste materials. Therefore,the recycling of cemented carbide waste is conducive to saving resources and protecting the environment. The electrochemical behaviour of W(Ⅵ) in the NaCl-KCl-Na2WO4 molten salt system was investigated by cyclic voltammetry(CV). The effect of electrolytic voltage on the morphology and microstructure of anodic dissolved alloy waste were studied by SEM and XRD. The results show that the electrochemical reduction process of W(Ⅵ) in the NaCl-KCl-Na2WO4 molten salt system is quasi-reversible and controlled by diffusion. The diffusion coefficient is 6.252×10-5 cm2·s-1 at 750 ℃. With the increase of electrolysis voltage, the surface morphology of cemented carbide waste changed from granular flocculent porous state to honeycomb, and then black lump-like substances appeared on the surface. The tungsten and cobalt metal in the cemented carbide scrap can be selectively separated and recycled by controlling the electrolysis voltage. The cobalt in the cemented carbide scrap is preferentially dissolved with tungsten, and changing cathode electrolysis by increasing voltage can refine pure tungsten products.
Key words:  cemented carbide scrap    resource recovery    tungsten    molten salt electrolysis    electrochemical behavior
出版日期:  2022-06-05      发布日期:  2022-06-08
ZTFLH:  TF841.1  
基金资助: 江西省自然科学基金(20192BAB206019);江西省教育厅科学技术研究项目(GJJ180449)
通讯作者:  286401206@qq.com   
作者简介:  李亮星,江西理工大学能源与机械工程学院副教授、硕士研究生导师。2016年东北大学冶金学院有色金属冶金专业博士毕业。目前主要从事稀有金属资源高效开发与应用、高性能材料制备及应用、固体废弃物处理与温室气体减排等方面的研究工作。
黄茜琳,江西理工大学能源与机械工程学院实验师。2009年于江西理工大学材料与化学工程学院有色金属冶金专业硕士毕业。主要从事萃取冶金、有色金属二次资源综合回收利用等方面的研究工作。
引用本文:    
李亮星, 朱志城, 贾孟熹, 黄茜琳. 硬质合金废料电解回收钨及W(Ⅵ)在熔盐中的电化学行为[J]. 材料导报, 2022, 36(Z1): 22010043-6.
LI Liangxing, ZHU Zhicheng, JIA Mengxi, HUANG Xilin. Recovery Tungsten from Cemented Carbide Waste by Electrolysis and Electrochemical Behavior of Tungsten Ions in Molten Salts. Materials Reports, 2022, 36(Z1): 22010043-6.
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http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2022/V36/IZ1/22010043
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