Electrochemical Leaching of Tungsten from Hard Metal Alloy Using Molten Sodium Hydroxide
| Autor: | Kensuke Kuroda, Takeshi Hagio, Ren Kasuga, Yuki Kamimoto, Masanori Kamiya, Ryoichi Ichino |
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| Rok vydání: | 2015 |
| Předmět: |
Electrolysis
Materials science Hard metal Mechanical Engineering Alloy Metallurgy Tantalum Oxide chemistry.chemical_element Tungsten engineering.material Condensed Matter Physics law.invention chemistry.chemical_compound chemistry Mechanics of Materials law Tungsten carbide engineering General Materials Science Molten salt |
| Zdroj: | MATERIALS TRANSACTIONS. 56:733-737 |
| ISSN: | 1347-5320 1345-9678 |
| DOI: | 10.2320/matertrans.m2014316 |
| Popis: | Hard metal alloy, which is used as material for cutting tools, comprises tungsten carbide, cobalt, and other elements and possesses excellent hardness and heat resistance. Hard metal alloy is difficult to recycle, and its rate of recycling in Japan is low. In this study, components of hard metal alloy were leached by electrolysis in molten sodium hydroxide. The optimum experimental condition was potentiostatic electrolysis at an oxidation potential of ¹0.7V. Tungsten constituted 99.7mass% of the leached component in the molten salt, and other metals oxidized to passive materials. Tantalum was dissolved in the molten salt without electrolysis. Chromium was oxidized from its metal state to its trivalent oxide, which was converted to the hexavalent oxide by trace oxygen in the atmosphere of the reactor. [doi:10.2320/matertrans.M2014316] |
| Databáze: | OpenAIRE |
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