Effect of TiO2 on viscosity and structure of high-temperature slag wool melts
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摘要: 为了研究TiO2含量的变化对矿渣棉高温熔体黏度的影响，以CaO–MgO–Al2O3–SiO2–TiO2五元渣系为研究对象，采用内柱体旋转法，系统研究了酸度系数为1.4时矿渣棉高温熔体的黏度变化规律，并结合拉曼光谱分析，探索了熔渣结构的变化特性。结果表明：当TiO2含量从1%增加至4%时，熔体黏度逐渐降低，黏流活化能由170.45 kJ/mol降至158.62 kJ/mol。当温度高于1 350 ℃时，样品黏度均低于1.5 Pa·s，流动性良好。同时，熔体内硅氧四面体结构中的Q0和Q1不断增加，而Q2和Q3逐渐降低，平均桥氧数由1.69降至0.95，熔体结构聚合度减小。Ti–O键不断增多，降低了熔体结构的稳定性。Abstract: In order to study the effect of TiO2 on the viscosity of high-temperature slag wool melts, the CaO–MgO–Al2O3–SiO2–TiO2 based slag system was used as the research object. And the viscosity variation of the slag wool melt with the acidity coefficient of 1.4 was systematically studied by using the cylinder rotation method, and the changes of slag structure were analyzed by Raman spectra. The results show that when the content of TiO2 increases from 1% to 4%, the viscosity of the melt gradually decreases, and the activation energy of viscous flow decreases from 170.45 kJ/mol to 158.62 kJ/mol. When the temperature is higher than 1 350 ℃, the viscosity of the samples is lower than 1.5 Pa·s, which means the melts have well fluidity. Meanwhile, Q0 and Q1 within the [SiO4]-tetrahedral structure gradually increase, while Q2 and Q3 gradually decrease. The average number of bridge oxygen decreases from 1.69 to 0.95, and the polymerization degree of the melt structure decreases. The increase of the Ti–O bond reduces the stability of the melt structure.
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Key words:
- acidic Ti-bearing slag /
- slag wool /
- viscosity /
- activation energy /
- melt structure /
- Raman spectra
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图 4 不同TiO2含量下熔体黏度与温度的关系
Figure 4. Relationship between temperature and viscosity of melts with varying TiO2 contents
图 5 不同TiO2含量下熔体的拉曼光谱曲线
Figure 5. Raman spectra of the melts with varying TiO2 contents
表 1 试验渣系组成方案
Table 1. Experimental compositions of slags
编号 物料添加量 /g 预熔渣化学成分 /% Slag SiO2 CaO Al2O3 MgO CaO SiO2 Al2O3 MgO TiO2 Mk 0 100 38.89 31.11 14.19 8.74 5.35 1# 17.20 41.40 26.34 8.56 6.50 33.26 46.66 11.23 7.93 0.92 1.4 2# 37.38 34.44 17.75 5.70 4.73 32.74 46.38 10.89 8.01 1.98 1.4 3# 56.07 28.00 9.79 3.04 3.10 32.29 45.74 10.94 8.07 2.96 1.4 4# 74.77 21.55 1.83 0.39 1.47 31.82 44.91 11.08 8.12 4.07 1.4 
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表 2 TiO2含量对熔体黏流活化能的影响
Table 2. Effect of TiO2 on the viscous activation energy of melts
w(TiO2)/% 回归方程 拟合度（R2） 活化能Eη/（kJ•mol−1） 1 y=20 501.66x−12.36 0.994 4 170.45 2 y=19 705.38x−11.97 0.998 0 163.83 3 y=19 580.75x−12.04 0.996 3 162.79 4 y=19 079.13x−11.77 0.995 4 158.62
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表 3 硅氧四面体中Qn的面积分数以及平均桥氧数计算结果
Table 3. The area fraction of Qn in silicon-oxygen tetrahedron and the calculation results of mean bridging oxygen number
序号 Q0 /% Q1/% Q2/% Q3 /% 平均桥氧数 1 16.54 23.85 33.13 26.48 1.69 2 20.90 26.44 27.78 24.88 1.56 3 29.80 19.18 35.01 16.01 1.37 4 40.52 32.29 19.22 7.97 0.95
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