NDLI: Electrochemical Leaching of Tungsten from Hard Metal Alloy Using Molten Sodium Hydroxide

Content Provider	Semantic Scholar
Author	Kamimoto, Yuki Kamiya, Masanori Kasuga, Ren Hagio, Takeshi Kuroda, Kensuke Ichino, Ryoichi
Copyright Year	2015
Abstract	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]
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.jim.or.jp/journal/e/pdf3/56/05/733.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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