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http://dx.doi.org/10.4191/KCERS.2011.48.2.173

Decomposition Mechanism of Waste Hard Metals using by ZDP (Zinc Decomposition Process)  

Pee, Jae-Hwan (Whiteware Technology Center, KICET)
Kim, Yoo-Jin (Engineering Ceramic Center, KICET)
Sung, Nam-Eui (Recytechkorea Inc.)
Hwang, Kwang-Taek (Whiteware Technology Center, KICET)
Cho, Woo-Seok (Whiteware Technology Center, KICET)
Kim, Kyeong-Ja (Whiteware Technology Center, KICET)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.2, 2011 , pp. 173-177 More about this Journal
Abstract
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 $1000^{\circ}C$.
Keywords
Recycling; Zinc decomposition process; Tungsten carbide; Cobalt; Waste hard metals;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 1
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