칼슘熱還元에 의한 ZrO2로부터 지르코늄 粉末 製造
Zirconium Powder Preparation from ZrO2 by Calciothermic Reduction
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초록
본 연구에서는 액상 칼슘에 의한 ZrO2의 직접환원에 대하여 조사하였다. ZrO2의 직접환원에 미치는 Ca과 ZrO2의 몰비, 반응시간, 그리고 반응온도의 영향에 대하여 검토하였다. 실험은 5분에서 60분까지 Ar 분위기의 밀폐된 스테인리스강제의 반응기에서 실시하였다. 반응온도 1223 K, Ca과 ZrO2의 몰비가 3 이상인 조건에서 대부분의 ZrO2는 5분만에 Zr으로 환원되었다. 반응온도가1337 K이고 Ca을 이론적인 양의 2배를 첨가한 경우 금속 Zr 중의 산소농도는 최저 0.66 wt%를 나타내었다. 그리고 Zr 입자의 형상은 반응온도와 반응시간에 큰 영향을 받는 것으로 나타났다.
Abstract
In this study, direct reduction of ZrO2 using liquid calcium was investigated. The influence of molar ratio of Ca and ZrO2,reaction time and temperature on the reduction behavior of ZrO2 was studied. Experiments were conducted in a closed stainless steel chamber under Ar atmosphere during 5 to 60 minutes. Most of the ZrO2 was reduced to Zr in 5 minutes at 1223 K and 3Ca/ZrO2 molar ratio. The minimum oxygen content in reduced metal Zr was obtained about 0.66 wt% at 1373 K after 30minutes and 4 Ca/ZrO2 molar ratio. The morphology of zirconium powder obtained was highly affected by the reaction temperature and reaction time.
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