MgO对红土镍矿高炉冶炼渣流动性及热稳定性的影响

doi:10.13228/j.boyuan.issn1001-0963.20240236

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钢铁研究学报 ›› 2025, Vol. 37 ›› Issue (3) : 326-334. DOI: 10.13228/j.boyuan.issn1001-0963.20240236

冶炼与加工

MgO对红土镍矿高炉冶炼渣流动性及热稳定性的影响

任奕泽, 邢相栋, 吕明, 蔺旭辉, 余志恒, 王保荣, 郭鹏辉

作者信息 +

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

REN Yize, XING Xiangdong, LÜ Ming, LIN Xuhui, YU Zhiheng, WANG Baorong, GUO Penghui

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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1 450 ℃时,黏度均低于1.0 Pa·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Q⁰单体和Q¹二聚体结构单元,明显降低Q²链状和Q³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。

Abstract

The influence of MgO on the viscosity and free running temperature of laterite nickel ore smelting slag was investigated. The structural change of the slag was analyzed by Fourier infrared spectroscopy and Raman spectroscopy. Meanwhile, the heat capacity, enthalpy change and extreme heat release of laterite nickel ore smelting slag were calculated by thermodynamics. The results show that the viscosity of laterite nickel ore smelting slag decreases with the increase in MgO content, and the viscosity is lower than 1.0 Pa·s at temperatures higher than 1 450 ℃. The free running temperature increases slightly, which exhibits good fluidity. The heat capacity, enthalpy change, and the extreme heat release of laterite nickel ore smelting slag gradually increase with the increase in MgO content. The Q⁰ and Q¹ structural units in laterite nickel ore smelting slag increase, while the Q² and Q³ 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 improve the 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.

导出引用

任奕泽, 邢相栋, 吕明, 蔺旭辉, 余志恒, 王保荣, 郭鹏辉. MgO对红土镍矿高炉冶炼渣流动性及热稳定性的影响[J]. 钢铁研究学报, 2025, 37(3): 326-334 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240236

REN Yize, XING Xiangdong, LÜ Ming, LIN Xuhui, YU Zhiheng, WANG Baorong, GUO Penghui. MgO on viscosity and thermal stability of laterite nickel ore blast furnace slag[J]. Journal of Iron and Steel Research, 2025, 37(3): 326-334 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240236

中图分类号： TF534.2

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