有色金属科学与工程2025，Vol.16Issue(3)：367-375,9.DOI:10.13264/j.cnki.ysjskx.2025.03.005
MgO对复合铁酸钙生成和还原行为的影响
Study on formation and reduction behavior of silico-ferrite of calcium and aluminum(SFCA)by MgO
摘要
Abstract
Composite calcium ferrite is the main bonding phase in high basicity sinter.As the main element in the sinter,MgO affects not only the formation of calcium ferrite in the sintering process but also its reduction behavior when dissolved in iron ore.This paper studied the effects of MgO on composite calcium ferrite formation and hydrogen-rich reduction behavior.The results show that when the roasting temperature is 1 250℃,with the increase of MgO content from 0%to 5.5%,the content of magnesium-containing magnetite increases,which is distributed around or in calcium ferrite,which reduces the liquid phase amount of the sintering process and the rate of needle calcium ferrite production,thus resulting in the decrease of sinter strength and reduction rate.In addition,low-temperature thermogravimetric experiments show that the activation energy of composite calcium ferrite increased at first and then decreased with the increase of magnesium content.When the magnesium content is less than 4%,the most likely reaction mechanism function is R2,a two-dimensional shrinking cylinder phase boundary reaction model,and the differential form of the equation is f(α)=2(1-α)1/2.关键词
复合铁酸钙/氧化镁/固结机理/还原动力学Key words
silico-ferrite of calcium and aluminum/magnesia oxide/consolidation mechanism/reduction kinetics分类
矿业与冶金引用本文复制引用
齐玉磊,陈衍彪,郭豪..MgO对复合铁酸钙生成和还原行为的影响[J].有色金属科学与工程,2025,16(3):367-375,9.基金项目
中国五矿科技专项计划基金资助项目(2020ZXA01) （2020ZXA01）
