Recovery of WC and Co from cemented carbide scraps by remelting and electrodissolution |
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| Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;2. Key Laboratory for Metallurgy and Material Processing of Rare Metals, Central South University, Changsha 410083, PR China;1. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea;2. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden 80401, USA;3. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea;1. Department of Materials Science and Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;2. Department of Materials Science and Engineering, MUT, Tehran, Iran;1. Centre of Excellence in Hypersonics, Indian Institute of Science, Bangalore, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kanpur, India;3. Materials Research Centre, Indian Institute of Science, Bangalore, India;4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India;1. UEMS, Department of Physics, CP 351, 79804-970 Dourados, MS, Brazil;2. IPEN, Center of Technology, Science and Materials, 05508-000 Sao Paulo, SP, Brazil;3. UFMS, Institute of Physics, 79070-900 Campo Grande, MS, Brazil;4. University of Sheffield, Department of Materials Science and Engineering, Sheffield S1 3JD, UK;5. UNESP, Department of Physics, UNESP, 17.033-360, Bauru, SP, Brazil;1. Department of Mechanical Engineering, Pennsylvania State University, PA 16802, USA;2. Applied Research Laboratory, Pennsylvania State University, PA 16802, USA;3. Wright Patterson AFB, Dayton, OH 45433, USA |
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| Abstract: | A novel method was proposed in this study to recycle WC and Co from cemented carbide scraps by remelting and electrodissolution. WC was recrystallized and purified through melting process. The WC that embedded in alloy was independent of each other and thus was easily separated by electrodissolution. The effects of dissolving parameters were investigated, and the results indicated that the maximum dissolving rate was 0.045 g·h?1·cm?2 and the anodic passivation was not found even at 500 A·m?2 of current density. In addition, the temperature and concentration of HCl were irrelevant to the rate and the current efficiency of the electrolysis. The SEM showed that the final WC powder was 5–20 μm in particle size with a regular shape, and the Co was directly recycled from the cathode at the same time. |
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