Experimental and Theoretical Studies on the Viscosity–Structure Correlation for High Alumina-Silicate Melts
Experimental and Theoretical Studies on the Viscosity–Structure Correlation for High Alumina-Silicate Melts
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DOI：
10.1007/s11663-017-0963-3
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
Trinath Talapaneni;N. Yedla;S. Pal;S. Sarkar
中科院分区：
文献类型：
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作者：
Trinath Talapaneni;N. Yedla;S. Pal;S. Sarkar
高炉由于装入低品位矿石，终渣中的氧化铝（Al2O3> 25%）较高。为了研究这种高氧化铝炉渣的粘度行为，通过保持化学组成为Al 2O3（25 - 30wt%）、CaO/SiO 2比（0.8 - 1.6）和MgO（8 - 16wt%），以实验室规模制备合成炉渣。利用化学热力学软件FactSage 7.0对上述渣系的液相线温度和粘度进行了预测。实验粘度测量在高于1748 K至1848 K（1475 ° C至1575 ° C）范围内的液相线温度下进行。从FactSage获得的粘度值与实验值非常吻合。利用傅里叶变换红外光谱（FTIR）和拉曼光谱分析了熔渣的粘度和结构特性。据观察，增加CaO/SiO2比和MgO含量的炉渣解聚的硅酸盐结构。这导致炉渣的粘度和活化能（167至149 kJ/mol）降低。此外，Al2O3的加入通过铝硅酸盐结构的聚合提高了渣的粘度，活化能从154 kJ/mol增加到161 kJ/mol。实验结果表明，活化能与基于Arrhenius方程的Shankar模型吻合较好。
Blast furnaces are encountering high Alumina (Al2O3> 25 pct) in the final slag due to the charging of low-grade ores. To study the viscosity behavior of such high alumina slags, synthetic slags are prepared in the laboratory scale by maintaining a chemical composition of Al2O3(25 to 30 wt pct) CaO/SiO2ratio (0.8 to 1.6) and MgO (8 to 16 wt pct). A chemical thermodynamic software FactSage 7.0 is used to predict liquidus temperature and viscosity of the above slags. Experimental viscosity measurements are performed above the liquidus temperature in the range of 1748 K to 1848 K (1475 °C to 1575 °C). The viscosity values obtained from FactSage closely fit with the experimental values. The viscosity and the slag structure properties are intent by Fourier Transform Infrared (FTIR) and Raman spectroscopy. It is observed that increase in CaO/SiO2ratio and MgO content in the slag depolymerizes the silicate structure. This leads to decrease in viscosity and activation energy (167 to 149 kJ/mol) of the slag. Also, an addition of Al2O3content increases the viscosity of slag by polymerization of alumino-silicate structure and activation energy from 154 to 161 kJ/mol. It is witnessed that the activation energy values obtained from experiment closely fit with the Shankar model based on Arrhenius equation.