摘要
为了进一步明确MgO对低铝高炉渣流动性和熔化性的影响机理,以酒钢高炉渣成分为基础,通过黏度试验并结合FactSage热力学软件分别研究了不同MgO质量分数的炉渣黏度、熔化温度、液相区变化以及炉渣冷却过程的物相变化。结果表明,炉渣黏度和熔化性温度随MgO质量分数的增加而降低,MgO质量分数控制在8%左右,可满足酒钢炉渣流动性的要求;随着MgO质量分数的增加,熔化区间增大,炉渣液相区远离CaO区域,向SiO2和Al2O3区域扩大;冷却过程中,MgO质量分数的增加,有利于黄长石的形成,从而抑制硅灰石和假硅灰的形成。1 350℃时炉渣流动性受炉渣结构聚合度和渣中固相质量分数的双重影响,1 400℃以上炉渣流动性主要与其结构有关。低铝渣熔化性温度主要由炉渣结构聚合度和渣中镁黄长石质量分数共同决定。
In order to further clarify the impact mechanism of MgO on the fluidity and melting property of low-alumina blast furnace slag,the viscosity,melting temperature,the change of liquid region of blast furnace slag and phase change of the slag during cooling process with different w（MgO） were studied based on the composition of Jiusteel blast furnace slag through viscosity experiment and the Fact Sage thermodynamic software. The results show that the slag viscosity and critical melting temperature decrease with the increase of w（MgO）,and w（MgO） is controlled within 8%,which can meet the requirements of the fluidity of Jiusteel blast furnace slag. The melting interval increases with the increase of w（MgO）. The liquid phase zone is far away from CaO region and extends to the SiO2 and Al2O3 region. During the cooling process,the increase of w（MgO） is favorable for the formation of melilite,but inhibits the formation of wollastonite and pseudo wollastonite.The fluidity of slag at 1 350 ℃ is affected by the polymerization degree of slag structure and the solid phase content in slag. The fluidity of slag above 1 400 ℃ is mainly related to its structure. The melting temperature of low aluminum slag is also mainly determined by the degree of polymerization of the slag structure and the content of magnesium feldspar in the slag.
作者
常治宇
张建良
宁晓钧
许仁泽
焦克新
白兴全
CHANG Zhi-yu;ZHANG Jian-liang;NING Xiao-jun;XU Ren-ze;JIAO Ke-xin;BAI Xing-quan(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Hongxing Iron and Steel Co.,Ltd.,Jiusteel（Group）Co.,Ltd.,Jiayuguan 735100,Gansu,China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第7期10-15,37,共7页
Iron and Steel
基金
国家自然科学基金青年基金资助项目(51704019)
关键词
炉渣
FactSage
黏度
熔化温度
液相区
blast fumace slag
FactSage
viscosity
melting property： liquid region
