摘要
为促进高钛高炉渣中钙钛矿相选择性析出，满足选矿分离的要求，分别在恒温和连续冷却过程中研究了钙钛矿相的析出行为。实验结果表明，钙钛矿相析出的适宜温度区间为１４００～１３００℃，熔渣在此温度范围内缓慢冷却（冷却速度０．５℃／ｍｉｎ），可有效促进钙钛矿相析出并使其枝晶产生粗化，结晶量达２４．８９％，晶粒度达４８．２７μｍ。此外，通过钙钛矿晶体形貌的变化，探讨了枝晶粗化机理，认为晶体产生缩颈重熔促进了枝晶粗化。
The precipitating behavior of perovskite phase in isothermal and continuous cooling processes was investigated in order to promote the selective precipitation of perovskite phase in the blast furnace slags bearing higher titania and to meet the requirement for separation process. The experimental results showed that the suitable temperature range for precipitating perovskite phase was from 1 400 ℃ to 1 300 ℃ in which the precipitation was promoted effectively and its dendrites were coarsened by cooling the molten slags slowly (cooling rate 0.5 ℃/min). As a result, the precipitating rate was 24.89 % and the grain size 48.27 μm. In addition, the coarsing mechanism of perovskite phase was discussed by studying its morphology changes. It was considered that by the remelting in the necked region of the dendrites the dendrites′ coarsing was promoted.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
1998年第3期70-73,共4页
Journal of Iron and Steel Research
基金
国家自然科学基金
高等学校博士学科点专项科研基金
关键词
高钛高炉渣
钙钛矿相
枝晶粗化
热处理
blast furnace slags bearing higher titania,perovskite phase,coarsing dendrites
