真空碳热还原处理钛精矿制备高品位钛渣的热力学与动力学研究

我国攀西地区拥有丰富的钛资源，但基本属于高钙镁岩矿，TiO2品位相对较低。采用传统的电炉法冶炼获得的高钛渣中同样含有较高的钙镁，这对后续采用氯化法生产钛白工艺带来了很大困难。因此，低成本高效地脱除高钛渣中的钙、镁杂质是采用攀枝花钛精矿通过氯化法生产钛白工艺取得成功的关键。针对该问题，首次提出真空碳热还原钛精矿脱除钙、镁等杂质制备高品位钛渣的新工艺。本项目首先采用FactSage软件计算温度、压力和配碳量等因素对渣相和气相成分及其含量变化的影响规律，系统地了解其反应过程；在此基础上，深入研究真空碳热还原钛精矿过程的反应热力学、多元多相体系的相平衡和反应动力学，以及杂质元素与渣相分离的调控规律与机制；最终获得真空碳热还原处理钛精矿制备高品位钛渣过程的物理化学特性，以期为攀西地区钛精矿高效清洁利用及工业化应用提供若干理论基础和技术支持。

There are lots of titanium resource in the Panzhihua-Xichang area, in China, but most of which has high content of calcium magnesium, were rock ore and the grade of TiO2 is low. The high calcium magnesium in high titania slag produced by traditional electric furnace smelting method hinders the later manufacture of titanium though the way of chlorination. So the key of successful titanium crafts by ilmenite chlorination is removing the high calcium magnesium in high titanium slag, lowly cost and efficiently. Based on the question, the vacuum carbothermic reduction of ilmenite for removing magnesium and calcium to prepare high titania slag was given for the first time. Firstly, the project exploits the soft of FactSage to calculate the influence of temperature, pressure, carbon content on the slag phase and gas phase composition and their contents, and then understand the process of ilmenite vacuum carbothermic reduction. Along of the database, we should do depth study on thermodynamics of the ilmenite decomposition process, phase equilibria and reaction kinetics with multiphase and the mechanism of the impurity elements separated from the slag during the new process. At last, obtain the physical chemistry properties of the process of vacuum carbothermic reduction of ilmenite, and then provide some theoretical basis and technical support for efficiency clean utilization and industrial application of ilmenite in Panzhihua, China.