MnO对高炉渣等温析晶动力学的影响  

Effect of MnO on the isothermal crystallization kinetics of blast furnace slag

作　　者：杨佳毅 田铁磊 张玉柱 龙跃 靳鑫玉 寇鑫林 Yang Jiayi;Tian Tielei;Zhang Yuzhu;Long Yue;Jin Xinyu;Kou Xinlin(North China University of Technology;Hebei Key Laboratory of Modern Metallurgical Technology)

机构地区：[1]华北理工大学冶金与能源学院 [2]河北省现代冶金技术重点实验室

出　　处：《冶金能源》2025年第1期39-44,共6页Energy For Metallurgical Industry

基　　金：国家自然科学基金区域创新发展联合基金资助项目(U20A20271);河北省自然科学基金资助项目(E2020209184);河北省教育厅资助项目(ZD2021084);唐山市科技支撑项目(20150217C)。

摘　　要：文章通过单丝热偶法研究了等温冷却条件下MnO质量分数对调质渣析晶行为的影响规律,分析在不同MnO质量分数下调质渣矿相结构随着温度的演变规律,并在此基础上利用JMA动力学方程建立调质渣在不同MnO质量分数下的析晶动力学模型。实验结果表明,MnO质量分数对调质渣的析晶行为有显著影响,当MnO质量分数从0.17%增至12.24%时,调质渣中晶体逐渐难以析出,但当MnO质量分数提高至16.32%时,调质渣的析晶能力得到加强;与原始高炉渣相比,MnO调质渣的主要析出矿相增加了锰橄榄石相与锰氧化物相;调质渣的析晶方式为表面形核、一维方向生长,根据阿伦尼乌斯公式并通过线性拟合得出,调质渣中MnO质量分数的增加会提高其析晶活化能,当MnO质量分数为12.24%时,活化能最大,为606.2 kJ/mol,但MnO质量分数达到16.32%时,活化能降低至最小,为373.9 kJ/mol。This study investigates the influence of MnO mass fraction on the crystallization behavior of modified blast furnace(BF)slag under isothermal cooling conditions using the single hot thermocouple technique(SHTT)and the mineral evolution in the modified BF slag is analyzed under different MnO mass fraction conditions.Based on this analysis,a crystallization kinetic model is established using the JMA dynamic equation.The experimental results show a significant effect of MnO mass fraction on the crystallization behavior of the modified BF slag.As the MnO mass fraction increases from 0.17%to 12.24%,the precipitation of crystals in the modified BF slag gradually becomes more difficult.However,when the MnO mass fraction is further elevated to 16.32%,the crystallization ability of the modified BF slag is enhanced.Compared to the original BF slag,the major precipitated mineral phases in the MnO-modified BF slag are the manganese olivine phase and manganese oxides phase.The crystallization process of the modified BF slag follows surface nucleation and one-dimensional growth.The Arrhenius equation and linear fitting indicate that the MnO mass fraction increase in modified BF slag leads to a higher crystallization activation energy.With an MnO mass fraction of 12.24%,the highest activation energy,measuring 606.2 kJ/mol.However,when the MnO mass fraction reaches 16.32%,the activation energy decreases to its minimum value of 373.9 kJ/mol.

关 键 词：高炉渣 MNO 等温冷却 析晶动力学 

分 类 号：TG1[金属学及工艺—金属学]