TiO2-Al2O3-CaO-SiO2低碱度高钛渣熔体黏度特性

研究了TiO₂含量、Al₂O₃含量以及二元碱度(CaO/SiO₂)对TiO₂-Al₂O₃-CaO-SiO₂低碱度高钛渣黏度的影响.实验采用旋转柱体法在1633-1873K温度范围内对渣系熔体黏度进行了测量.当TiO₂质量分数为23%-43%、Al₂O₃质量分数为3%-12%和二元碱度为0.3-0.7时,钛渣熔体黏度随TiO₂含量和碱度的增加而降低,随Al₂O₃含量的增加而增加.通过对转底炉-电炉熔分过程渣系脱硫能力计算,得知在低碱度高钛渣中TiO₂属于酸性.依据黏度测量数据和对TiO₂属性的界定,通过修正Urbain模型建立了低碱度高钛渣的熔体黏度预报模型.模型预测结果误差为11%,证明新模型对于低碱度高钛渣的黏度具有良好的预报效果. 

Viscosity characteristics of TiO2-Al2O3-CaO-SiO2 fully liquid slags with high TiO2 content and low mass ratio of CaO to SiO2

The effects of TiO₂ content, Al₂O₃ content and binary basicity (CaO/SiO₂) on the viscosity of a TiO₂-Al₂O₃-CaO-SiO₂ fully liquid slag with high TiO₂ content and low mass ratio of CaO to SiO₂ were studied in this paper. Experimental determinations of the viscosity were carried out in the temperature range from 1633 to 1873 K using the rotation cylinder method. When the TiO₂ content is from 23% to 43%, the Al₂O₃ content is from 3% to 12%, and the binary basicity is from 0.3 to 0.7, the viscosity of the slag decreases with increasing TiO₂ content and alkalinity, but increases with increasing Al₂O₃ content. TiO₂ is classified as an acidic oxide by calculating the sulfur partition rate of the slag in the electric furnace melting process. Based on the data of viscosity measurement and the definition of TiO₂ attributes, a new melt viscosity prediction model of the slag was proposed by modifying the Urbain model. Its prediction error is 11%, indicating that the model provides a reasonable prediction for fully liquid slags with high TiO₂content and low mass ratio of CaO to SiO₂.