Materials Reports 2022, Vol. 36 Issue (Z1): 22010043-6 |
METALS AND METAL MATRIX COMPOSITES |
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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
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School of Energy and Mechanical Engineering,Jiangxi University of Science and Technology, Nanchang 330013, China |
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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.
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Published: 05 June 2022
Online: 2022-06-08
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Fund:Natural Science Foundation of Jiangxi Province (20192BAB206019)and the Science and Technology Research Project of Education Department of Jiangxi Province(GJJ180449). |
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