YCl3-MgCl2 혼합 용융염 중 용융 Mg에 의한 Off-grade Ti 스크랩의 탈산
Deoxidation of Off-grade Ti scrap by Molten Mg in YCl3-MgCl2 Molten Salt
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초록
타이타늄의 제련 및 가공 공정에서 산소 농도가 높은 off-grade 스크랩이 발생되고 있다. 본 연구에서 이러한 off-grade Ti 스크랩을 혼합 염화물을 플럭스로 사용하여 Mg으로 탈산하였다. 실험은 α-Ti 영역(1,023~1,123 K)에서 실시하였으며, 반응 시간, 반응 온도, Mg양, 염화물 비율의 영향에 대하여 조사하였다. 플럭스로 사용된 YCl3가 MgO와 반응하여 MgO의 활동도를 낮추어 Mg에 의한 Ti의 탈산이가능하였으며, 1,073 K, 6시간 조건에서 Mg=3.6 g, YCl=0.22 일때 Ti scrap의 산소 농도가 0.5 %에서 최저 농도인 0.1117 %까지 감소하였다.
Abstract
Off-grade Ti generated from smelting and mechanical processing has a high oxygen content. In this work, off-grade Ti was deoxidized using Mg and a chloride mixture as the reductant and flux, respectively. The experiments were conducted in the α-Ti temperature range (1,023~1,123 K) and the effects of the reaction time, reaction temperature, quantitiy of Mg and chloride ratio on deoxidation were investigated. Notably, when YCl3 is used as the flux to react with MgO, it is possible to reduce the activity of MgO. Therefore Ti can be deoxidized using Mg. In this study, the O content was decreased from 0.5 wt% to 0.1004 wt% at 1073 K, for 6 hours, with Mg=3.6 g and YCl=0.22.
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