碱度对低钛型钒钛磁铁矿烧结成矿行为的影响
Effect of basicity on sintering behavior of low-titanium vanadium-titanium magnetite
摘要 碱度对低钛型钒钛烧结矿的质量有着重要的影响。通过烧结杯试验、矿相分析、扫描电子显微镜(SEM)和能谱(EDS)分析研究碱度对低钛型钒钛磁铁矿烧结成矿过程的影响和元素在烧结过程中的分布及迁移变化规律。结果表明:在烧结过程中同等接触条件下,CaO 优先与 TiO2反应生成钙钛矿,导致烧结矿的液相总含量较少;在碱度为1.9~2.7的范围内,随着碱度的提高,烧结矿中的钙钛矿含量提高,铁酸钙含量先小幅增加后快速升高,硅酸盐含量降低,烧结矿的冶金性能得到改善;元素分布情况为Ti主要赋存于钙钛矿中,V主要赋存于硅酸盐中,Fe 主要赋存于磁铁矿和赤铁矿中,Ca、Si 在硅酸盐和钙钛矿中的赋存量最多,随着碱度的提高,铁酸钙中Al、Mg含量增加,而在其他矿物中Al、Mg含量降低。
Abstract:
Basicity has an important effect on the sinter quality, especially for low-titanium vanadium?titanium sinter. The effect of basicity on sintering behavior of low-titanium vanadium?titanium mixture, and the transference and distribution of element in sintering process were researched by sinter pot test, mineralogical analysis, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. The results show that CaO preferentially reacts with TiO2, generating pervoskite, so that the total liquid phase content of the sinter is low. There is an increase in the perovskite concentration of the sinter with the basicity ranging from 1.9:1 to 2.7:1. With increasing the basicity, the calcium ferrite content increases slightly and then rises rapidly, while the silicate content decreases and the metallurgical property of the sinter is improved. As for the distribution of these elements in the sinter, Ti occurs mainly in perovskite, V occurs mainly in silicate, and Fe occurs mainly in magnetite and hematite. The most abundant occurrence of Ca and Si occurs in silicate and perovskite. With increasing the basicity, the contents of Al and Mg increase in calcium ferrite, while they decrease in other minerals.
Author: Song-tao YANG Mi ZHOU Tao JIANG Yan-jun WANG Xiang-xin XUE
作者单位: 东北大学材料与冶金学院,沈阳,110819 东北大学材料与冶金学院,沈阳 110819; 东北大学辽宁省冶金资源循环科学重点实验室,沈阳 110819
年,卷(期): 2015, (6)
机标分类号: TF5 TF1
在线出版日期: 2015年7月23日
基金项目: Projects (2012AA062302,2012AA062304) supported by the National High Technology Research and Development Program of China,Projects (51090384,51174051) supported by the National Natural Science Foundation of China,Project (2012DFR60210) supported by the International Cooperation of Ministry of China