掺铁尾矿改性高炉渣的结晶行为

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-06-01 DOI:10.1016/S1006-706X(17)30091-2
Qian-qian Ren , Yu-zhu Zhang , Yue Long , Shao-sheng Chen , Zong-shu Zou , Jie Li , Chen-guang Xu
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引用次数: 3

摘要

高炉炉渣是炼铁过程的副产物,加入铁矿尾矿可用于生产渣纤维。改性高炉渣的结晶行为对其纤维化过程有重要影响。为研究碱度对高炉渣结晶行为的影响,在常温下加入铁矿尾砂对高炉渣进行改性,并在1500℃下熔融。采用FactSage模拟、x射线衍射、扫描电镜背散射电子成像耦合能谱仪、热电偶技术等方法对改性高炉炉渣在冷却过程中的结晶行为进行了研究。发现初始结晶温度随碱度的增加而升高。在冷却过程中,碱度在0.7 ~ 0.9范围内可生成千英石、钙长石、斜辉石和硅灰石。其中有尖晶石相;而硅灰石在碱度为1.0时消失。当改性高炉渣的碱度在0.7 ~ 1.0范围内时,冷却过程中初始结晶温度由镁铝石的结晶控制。此外,冷却速度也会影响改性高炉渣的结晶。
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Crystallization behavior of blast furnace slag modified by adding iron ore tailing

Blast furnace (BF) slag is a by-product of the ironmaking process and could be utilized to manufacture slag fiber by adding iron ore tailing. The crystallization behavior of the modified BF slag is significant to the fibrosis process. To investigate the influence of basicity on the crystallization behavior, BF slag was modified by adding iron ore tailing at room temperature and melted at 1500 °C. FactSage simulation, X-ray diffraction, scanning electron microscopy backscattered electron imaging coupled to an energy dispersive spectrometer, and hot thermocouple technique analysis were performed to explore the crystallization behavior of the modified BF slag during the cooling process. It was found that the initial crystallization temperature increased with the increase in basicity. Melilite, anorthite, clinopyroxene, and wollastonite could be generated during the cooling process as basicity ranged from 0.7 to 0.9. Spinel could be found as one of the phases; however, wollastonite disappeared under a basicity of 1.0. The initial crystallization temperature was controlled by the crystallization of melilite during the cooling process when the basicity of the modified BF slag ranged from 0.7 to 1.0. Moreover, the cooling rate could also influence the crystallization of the modified BF slag.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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