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J. Korean Ceram. Soc. > Volume 48(2); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(2): 173.
doi: https://doi.org/10.4191/kcers.2011.48.2.173
ZDP(Zinc Decomposition Process)를 이용한 폐 초경합금의 분해기구
피재환, 김유진1, 성남의2, 황광택, 조우석, 김경자
한국세라믹기술원 도자세라믹센터
1한국세라믹기술원 엔지니어링세라믹센터
2리싸이텍코리아 기술연구소
Decomposition Mechanism of Waste Hard Metals using by ZDP (Zinc Decomposition Process)
Jae-Hwan Pee, Yoo-Jin Kim1, Nam-Eui Sung2, Kwang-Taek Hwang, Woo-Seok Cho, Kyeong-Ja Kim
Whiteware Technology Center, KICET
1Engineering Ceramic Center, KICET
2Recytechkorea Inc.
Decomposition promoting factors and decomposition mechanism in the zinc decomposition process of waste hard metals which are composed mostly of tungsten carbide and cobalt were evaluated. Zinc volatility amount was suppressed and zinc valatilization pressure was produced in the reaction graphite crucible inside an electric furnace for ZDP. Reaction was done for 2 h at $650^{circ}C$, which 100 % decomposed the waste hard metals that were over 30 mm thick. As for the separation-decomposition of waste hard metals, zinc melted alloy formed a liquid composed of a mixture of ${gamma}-{beta}1$ phase from the cobalt binder layer (reaction interface). The volume of reacted zone was expanded and the waste hard metal layer was decomposed-separated horizontally from the hard metal. Zinc used in the ZDP process was almost completely removed-collected by decantation and volatilization-collection process at $1000^{circ}C$.
Key words: Recycling, Zinc decomposition process, Tungsten carbide, Cobalt, Waste hard metals
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