Fundamental study on high-temperature chlorination reaction for the development of a novel process for recycling cemented carbide scrap

Research Project

Project/Area Number	15K14190
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Metal making/Resorce production engineering
Research Institution	The University of Tokyo
Principal Investigator	Taninouchi Yu-ki 東京大学, 生産技術研究所, 助教 (40644521)
Project Period (FY)	2015-04-01 – 2017-03-31
Project Status	Completed (Fiscal Year 2016)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000) Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000) Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords	タングステン / コバルト / 塩化反応 / 超硬工具 / リサイクル
Outline of Final Research Achievements	Thermodynamic analyses and fundamental experiments were performed to investigate suitable reaction conditions for the separation of tungsten from cemented carbide scrap as chloride and/or oxychloride vapors. It was found that tungsten in grinding sludge and its roasted product could be volatilized as chlorides and/or oxychlorides by reacting with chlorine gas or metal chlorides, such as iron trichloride, under a suitable oxygen partial pressure at around 900 K. High-temperature chlorination reaction has the potential to be utilized in the development of a novel recycling process with small environmental burden and high refining capacity.