TiO_(2)对矿渣棉高温熔体黏度和结构的影响

Effect of TiO_(2) on viscosity and structure of high-temperature slag wool melts

为了研究TiO_(2)含量的变化对矿渣棉高温熔体黏度的影响,以CaO–MgO–Al_(2)O_(3)–SiO_(2)–TiO_(2)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TiO_(2)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 k J/mol降至158.62 k J/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Q^(0)和Q^(1)不断增加,而Q^(2)和Q^(3)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。

In order to study the effect of TiO_(2) on the viscosity of high-temperature slag wool melts, the CaO–MgO–Al_(2)O_(3)–SiO_(2)–TiO_(2) 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 TiO_(2) 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, Q^(0) and Q^(1) within the [SiO_(4)]-tetrahedral structure gradually increase, while Q^(2) and Q^(3) gradually decrease. The average number of bridge oxygen decreases from1.69 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.