Study on viscous flow characteristics of CaO-SiO2- MgO-Al2O3-TiO2-CaCl2 slag system
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摘要: 炉渣的粘流特性与高炉的稳定顺行密切相关。研究了含氯高钛渣(CaO-SiO2-MgO-Al2O3-TiO2-CaCl2)的粘度和熔化性温度，并采用傅里叶变换红外光谱(FTIR)和拉曼光谱(Raman)分析其结构演变。结果表明，氯元素的加入可以降低炉渣粘度，简化炉渣结构。由于氯元素在高温下容易蒸发，因此在粘度测试过程中氯含量略有下降。粘性流动活化能的变化趋势与粘度的变化趋势相似。[SiO4]-四面体结构和Ti-O-(Ti或Si)键也会被破坏。Q2和Q3单元的相对面积分数减少，Q0和Q1单元的相对面积分数增加，导致炉渣聚合度降低。Abstract: The viscous flow characteristics of slag are closely related to the stability of the blast furnace. In this paper, the viscosity and melting temperature of chlorine-containing high-titanium slag (CaO-SiO2-MgO-Al2O3-TiO2-CaCl2) were studied, and their structural evolution was analyzed by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The results show that the addition of chlorine element can reduce the viscosity of the slag and simplify the structure of the slag. Due to the easy evaporation of chlorine element at high temperature, the chlorine content decreased slightly during the viscosity test. The variation trend of viscous flow activation energy is similar to that of viscosity. The [SiO4]− tetrahedral structure and Ti-O-Ti/Si bonds are also broken. The relative area fractions of the Q2 and Q3 units decreased and the relative area fractions of the Q0 and Q1 units increased, resulting in a decrease in the degree of slag polymerization.
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图 1 CaO-SiO2-MgO-Al2O3-TiO2-CaCl2渣XRD谱
Figure 1. XRD patterns of CaO-SiO2-MGO-Al2O3-TiO2-CaCl2 slag
图 2 炉渣粘度测量试验装置示意
Figure 2. Schematic diagram of the experimental device for measuring slag viscosity
图 3 氯含量、温度对炉渣粘度的影响
Figure 3. The effect of chlorine content and temperature on slag viscosity
图 4 不同氯含量下熔渣粘度与温度的关系
Figure 4. The relationship between slag viscosity and temperature with different chlorine contents
图 7 不同氯含量的CaO-SiO2-MgO-Al2O3-TiO2-CaCl2渣各波段的相对面积分数
Figure 7. Relative area fraction of each band of CaO-SiO2-MgO-Al2O3-TiO2-Cl2 slag with different chlorine content
表 1 渣样主要化学成分
Table 1. Main chemical compositions of slag sample
% 编号 CaO SiO2 MgO Al2O3 TiO2 CaCl2 C/S 1 29.82 25.97 7.41 14.33 22.47 0.00 1.15 2 29.52 25.71 7.34 14.19 22.24 1.00 1.15 3 29.22 25.45 7.26 14.04 22.03 2.00 1.15 4 28.93 25.19 7.19 13.90 21.79 3.00 1.15 5 28.03 24.41 6.97 13.47 21.12 6.00 1.15 6 26.84 23.37 6.67 12.90 20.22 10.00 1.15 
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表 2 不同Cl含量对熔渣粘流活化能的影响
Table 2. The effect of different Cl content on activation energy of slag viscous flow
编号 氯含量/% 活化能Ea/( kJ·mol−1) 1 0 260.719 2 0.49 257.360 3 0.90 254.341 4 1.39 250.742 5 2.96 243.442 6 5.21 231.819
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