MgO及碱度对FeOx-SiO2-CaO-MgO-Al2O3体系液相生成的影响

 为研究MgO含量及碱度对球团矿及烧结矿液相生成特性的影响,以FeO_x-SiO₂-CaO-MgO-Al₂O₃五元体系为研究基础,通过固定SiO₂和Al₂O₃质量分数,以碱度及MgO质量分数为变量,采用FactSage模拟与熔点熔速试验数据相结合的方法,探究了MgO质量分数及碱度变化对FeO_x-SiO₂-CaO-MgO-Al₂O₃体系液相生成特性的影响,并以此确定此五元体系最佳MgO质量分数及碱度范围,为企业生产实践提供理论支撑。结果表明,当体系w(MgO) 变化范围为1.5%～3.0%时,体系高熔点化合物的生成量随着MgO质量分数的提高而增加,抑制了液相生成,体系的液相区会随着MgO质量分数的增加而逐渐缩小;当碱度为2.0和1.8时,体系的熔融速率较为稳定,便于控制。

Effect of MgO and basicity on liquid phase formation of FeOx-SiO2-CaO-MgO-Al2O3 system

In order to study the effects of MgO content and alkalinity on the liquid phase formation characteristics of pellets and sinters. The five-element system of FeO_x-SiO₂-CaO-MgO-Al₂O₃ is used as a research basis. By fixing the content of SiO₂ and Al₂O₃, and using the basicity and MgO content as variables, the method of FactSage simulation and melting point melting rate experimental data is used to analyze the influence of changes in MgO content and alkalinity on the liquid-phase formation characteristics of FeO_x-SiO₂-CaO-MgO-Al₂O₃ system. Based on this, determine the optimal MgO content and alkalinity range of this five-element system is determined, and theoretical support for enterprise production practice is provided. The results show that when the MgO content of the system ranges from 1.5% to 3.0 %, the amount of high-melting-point compounds in the system increases with the increase of the content of MgO, which suppresses the generation of the liquid phase. It gradually shrinks, when the alkalinity is 2.0 and 1.8, the melting rate of the system is relatively stable and easy to control.