MgO对红土镍矿高炉冶炼渣流动性及热稳定性的影响  

Effect of MgO on viscosity and thermal stability of laterite nickel ore blast furnace slag

作　　者：任奕泽 邢相栋[1] 吕明[1] 蔺旭辉 余志恒 王保荣 郭鹏辉 REN Yize;XING Xiangdong;LüMing;LIN Xuhui;YU Zhiheng;WANG Baorong;GUO Penghui(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《钢铁研究学报》2025年第3期326-334,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52174325);陕西省创新能力支撑计划资助项目(2023-CX-TD-53);陕西省教育厅重点实验室科学研究计划资助项目(20JS072)。

摘　　要：研究了MgO对红土镍矿冶炼渣黏度及熔化性温度的影响,并结合红外光谱和拉曼光谱分析熔渣结构特征,计算炉渣热焓及极限热值,明确了MgO对红土镍矿高炉冶炼渣性能的影响机制。结果表明,红土镍矿冶炼渣的黏度随着渣中MgO的增加而降低,熔化性温度略微升高。熔炼温度高于1450℃时,黏度均低于1.0Pa·s,展现出良好的流动性。炉渣热容、焓变以及极限热值均随MgO含量的升高呈逐渐升高的趋势。MgO能够增加渣中Q^(0)单体和Q^(1)二聚体结构单元,明显降低Q^(2)链状和Q^(3)片状结构单元,且在实验研究范围内,炉渣网络聚合度(NBO/Si)平均数随MgO含量增加从1.79增大至2.06,炉渣结构变简单,流动性改善。MgO不仅能够有效改善红土镍矿高炉冶炼渣的流动性,也能够提高红土镍矿冶炼渣的热稳定性。The influence of MgO on the viscosity and free running temperature of laterite nickel ore smelting slag wasinvestigated.The structural change of the slag was analyzed by Fourier infrared spectroscopy and Raman spectrosc opy.Meanwhile,the heat capacity,enthalpy change and extreme heat release of laterite nickel ore smeltingslagwere calculated by thermodynamics.The results show that the viscosity of laterite nickel ore smeltin g slag decreases with the increase in MgO content,and the viscosity is lower than 1.0 Pa·s at temperatures higherthan 1450℃.The free running temperature increases slightly,which exhibits good idity.The heat capa city,enthalpy change,and the extreme heat release of laterite nickel ore smelting slag flugradually increase with theincrease in MgO content.The Q^(0) and Q^(1) structural unitsi n laterite nickel ore smelting slagi ncrease,while the Q_(2) and Q^(3) structural units decrease significantly.The average NBO/Si increases from 1.79 to 2.06 with MgO content.The slag structure becomes simpler and increases the fluidity.The addition of MgO can effectively improvethe fluidity of laterite nickel ore blast furnace smelting slag,and has a positive effect on improving the thermal stability of laterite nickel ore smelting slag.

关 键 词：MGO 红土镍矿 高炉渣 黏度 热力学计算 

分 类 号：TF534.2[冶金工程—钢铁冶金]