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http://dx.doi.org/10.7844/kirr.2012.21.6.32

Zirconium Powder Preparation from ZrO2 by Calciothermic Reduction  

Ha, Jung-Woo (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
Jang, Yong-Ik (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
Sohn, Ho-Sang (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
Publication Information
Resources Recycling / v.21, no.6, 2012 , pp. 32-38 More about this Journal
Abstract
In this study, direct reduction of $ZrO_2$ using liquid calcium was investigated. The influence of molar ratio of Ca and $ZrO_2$, reaction time and temperature on the reduction behavior of $ZrO_2$ was studied. Experiments were conducted in a closed stainless steel chamber under Ar atmosphere during 5 to 60 minutes. Most of the $ZrO_2$ was reduced to Zr in 5 minutes at 1223 K and 3 Ca/$ZrO_2$ molar ratio. The minimum oxygen content in reduced metal Zr was obtained about 0.66 wt% at 1373 K after 30 minutes and 4 Ca/$ZrO_2$ molar ratio. The morphology of zirconium powder obtained was highly affected by the reaction temperature and reaction time.
Keywords
Zirconium powder; Zirconium oxide; Calciothermic reduction; Calcium; Direct reduction;
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