含钛高炉渣黏度和熔化性能

doi:10.13228/j.boyuan.issn0449-749x.20220281

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摘要基于混料试验中单纯形质心法建立了CaO-SiO₂-Al₂O₃-MgO-2%TiO₂渣黏度和熔化性能预测模型,利用预测模型、FactSage和X射线衍射(XRD)研究了不同w(Al₂O₃)含钛炉渣的冶金性能,并探讨了高Al₂O₃炉渣中w(MgO)/w(Al₂O₃)对黏度和熔化性能的影响。结果表明,炉渣黏度和熔化性能预测模型具有较高的精度,误差分别小于5%和2%。随着Al₂O₃质量分数由10%增加至18%,黏度(η)、熔化性温度(t_M)和液相线温度(t_L)均升高;低熔点相黄长石(Melilite)开始析出温度和析出量逐渐增大,高熔点相钙钛矿(CaTiO₃)和低熔点相硅灰石(CaSiO₃)开始析出温度先增大后减小,还析出了少量高熔点相尖晶石。当Al₂O₃质量分数小于15%、温度为1 450～1 525 ℃时,炉渣黏度均小于0.55 Pa·s,且温度为1 500 ℃时黏度为0.32～0.39 Pa·s,t_M和t_L分别为1 370 ℃和1 330 ℃;Al₂O₃质量分数为15%～18%,炉渣析出的高熔点相CaTiO₃和尖晶石较多,黏度对温度较为敏感,1 525 ℃时黏度为0.3 Pa·s左右,1 450 ℃时黏度增加至0.8 Pa·s。随着w(MgO)/w(Al₂O₃)由0.24增加至0.72,炉渣黏度降低,t_M和t_L增大;Melilite开始析出温度约为1 425 ℃,CaTiO₃开始析出温度由1 310 ℃大幅增加至1 394 ℃,CaSiO₃析出量降低,尖晶石析出量明显增加。此外,不同w(Al₂O₃)和w(MgO)/w(Al₂O₃)炉渣基础相均为Melilite,其开始析出温度高于CaTiO₃;w(Al₂O₃)对t_M和Melilite开始析出温度影响显著,w(MgO)/w(Al₂O₃) 对t_L和CaTiO₃开始析出温度影响显著。当碱度为1.21时,高Al₂O₃炉渣适宜w(MgO)/w(Al₂O₃)为0.48～0.60,t_M和t_L分别为1 400 ℃和1 340 ℃左右,炉渣流动性和稳定性较好。

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	邱国兴
	缪德军
	蔡明冲
	李小明
	战东平
	柳勇发

关键词 ：含钛渣, 混料试验, 黏度, 熔化性能, w(MgO)/w(Al₂O₃), 相组成

Abstract：Based on the simplex centroid method in the mixing test, prediction models for the viscosity and melting property of CaO-SiO₂-Al₂O₃-MgO-2%TiO₂ slags were established. The metallurgical properties of different Al₂O₃ titanium-containing slags were studied by using the prediction models, FactSage and XRD. The influence of w(MgO)/w(Al₂O₃) on viscosity and melting property of high Al₂O₃ slag was also discussed. The results show that prediction models of slag viscosity and melting property has high accuracy, with errors less than 5% and 2%, respectively. With the increase of w(Al₂O₃) from 10% to 18%, viscosity (η), melting temperature (t_M) and liquidus temperature (t_L) all increased. Both the precipitation temperature and precipitation amount of the low melting point Melilite phase increased. The precipitation temperature of the high melting point perovskite phase CaTiO₃ and low melting point CaSiO₃ phase increased first and then decreased. A small amount of high melting point Spinel phase was precipitated. When w(Al₂O₃) was less than 15%, the slag viscosity was below 0.55 Pa·s at 1 450-1 525 ℃, and 0.32-0.39 Pa·s at 1 500 ℃, t_M and t_L were lower than 1 370 ℃ and 1 330 ℃, respectively; w(Al₂O₃) was 15%-18%, the high melting point phase CaTiO₃ and spinel were more precipitated from slags. The viscosity was more sensitive to temperature, the viscosity was about 0.3 Pa·s at 1 525 ℃, and increased to 0.8 Pa·s at 1 450 ℃. When w(MgO)/w(Al₂O₃) increased from 0.24 to 0.72, viscosity decreased, and t_M and t_L increased. The precipitation temperature of Melilite was about 1 425 ℃, and the precipitation temperature of CaTiO₃ increased from 1 310 ℃ to 1 394 ℃. The precipitation amount of CaSiO₃ decreased, and the precipitation amount of spinel increased significantly. In addition, the slags base phase of different w(Al₂O₃) and w(MgO)/w(Al₂O₃) are Melilite, and their precipitation temperature is higher than CaTiO₃. Al₂O₃ has a significant effect on the precipitation temperature and t_M of Melilite, w(MgO)/w(Al₂O₃) has a significant effect on the precipitation temperature and t_L of CaTiO₃.When the basicity is 1.21, the suitable w(MgO)/w(Al₂O₃) of high w(Al₂O₃)slag is 0.48 to 0.60, t_M and t_L are about 1 400 ℃ and 1340 ℃, respectively, and the slag has good fluidity and stability.

Key words： titanium-containing slag mixing test viscosity melting property w(MgO)/ w(Al₂O₃) phase composition

收稿日期: 2022-04-25

引用本文:

邱国兴, 缪德军, 蔡明冲, 李小明, 战东平, 柳勇发. 含钛高炉渣黏度和熔化性能[J]. 钢铁, 2022, 57(11): 42-52. QIU Guo-xing, MIAO De-jun, CAI Ming-chong, LI Xiao-ming, ZHAN Dong-ping, LIU Yong-fa. Viscosity and melting property of titanium-containing slag[J]. Iron and Steel, 2022, 57(11): 42-52.

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