【作者】 王明玉；

【导师】 涂赣峰； 隋智通；

【作者基本信息】 东北大学 ， 有色金属冶金， 2005， 博士

【摘要】 随着含钛高炉渣应用研究的深入，其实验已达到吨级半工业规模，与之相应的基础研究已成为目前重要研究课题。本文系统研究了含钛高炉熔渣氧吹炼体系中钛的选择性富集和钙钛矿相的长大行为以及熔渣的性质变化特征，确定了各相关因素的影响规律，优化了含钛高炉渣中钛选择性析出的条件。 从理论和工艺两方面，讨论了含钛高炉渣钛利用过程中最佳钛富集相的选择，并通过现场实验得出了添加剂、氧化处理对钛选择性富集和长大的影响规律：钢渣的添加可以促进钛的富集，但超过一定比例可使熔渣黏度显著增加不利于熔渣的进一步氧化和渣中钙钛矿相的长大。吹氧化处理含钛熔渣的同时，钢渣和Si-Fe粉适当比例的添加可同时促进钛的富集和钙钛矿晶粒的长大，钛的富集度可达91％，钙钛矿晶粒尺寸大于30μm的为78.4％。 利用摄像法对浸入式侧吹气体在熔池中的穿透行为以及底吹条件下熔池的表面特征进行了实验研究。在实验基础上，通过量纲分析和讨论，得出了气体无量纲穿透深度与熔池表面突起高度和宽度的经验关系方程式： H／d=2.6F_r^0.41(ρ_ld^1.5／η)^0.19 H_max=3.055Q^0.528 W=2.21Q^0.315η^0.035通过对多孔喷吹渣罐内混合过程的模拟研究，得出了混合时间的关系式： τ_m=78.7ε^-0.69η^1.08 本文得出的以上经验关系式在半工业化实验中都得到了很好的应用，并取得了满意的效果。 通过对含钛高炉渣氧化过程中温度变化的测定，并结合理论计算，建立了模拟熔渣氧化过程温度变化的简易模型：模型计算氧化过程中的温度变化趋势与实测数值基本一致。由于氧化放热，温度-更多还原

【Abstract】 With the development of the research on the titania bearing slag, the experiment of utilizing this slag has reached semi-industry scale, so the basic research corresponding with this scale has been a key projectsat at present. This research was focused on selectivity TiO₂-enrichment and the precipitation behavior of perovskite phase in titania bearing slag oxidized by air. As a result, the patterns of related factors and the optimum conditions were determined.The selection of the best Titania enrichment phase in titania bearing slag based on the selective separation technique was discussed from both theory and technology aspects. Based on the results got from semi-industry experiment, the influences of additives and oxidation on the selective enrichment and growth of Ti component have been got. The results show that increasing of steel slag does well to titania enrichment, however, it can cause the viscosity of slag increase remarkably while the content beyond a certain extension, so it isn’t useful for the oxidizing farther and the growth of the perovskite phase. Steel slag and Si-Fe powder added at an appropriate proportion during oxidizing can promote titania enrichment and perovskite phase grow up at the same time, the enrichment degree of titania can reach 91% and the area percent of perovskite phase whose grains are beyond 30μm is 78.4%.An experimental study on the penetration depth of immersed side-blown gas jet and the spout characteristics of molten slag free surface in a bottom blowing slag ladle model have been made with a photographic technique. Based on the results and the dimensional analysis as well as discussion, the empirical equations of the dimensionless penetration depth, spout height and spout width of molten slag free surface were established: Physical modeling has been conducted to investigate the mixing in air-stirred slag ladle with a porous plug. An empirical correlation for mixing time concerning the viscosity更多还原