氯化法生产二氧化钛工艺现状及研究进展

Current situation and research progress of titanium dioxide by chlorination

钛白具有优异的理化性能,被广泛应用于工业生产中,例如颜料、医疗、化妆品、半导体和航天技术等领域。目前生产钛白的技术主要为硫酸法和氯化法,其中氯化法生产更为符合经济和环保的双重要求,本文主要介绍了氯化法制备钛白粉的工艺流程,综述了近年来氯化法制备钛白粉的研究进展。在氯化法生产钛白粉的工艺过程中,TiCl_(4)和O_(2)的反应属于毫秒级别,由于反应速度较快,难以从实验层面去研究其反应过程,因此应该选用量子化学计算方法研究其微观、高速的反应过程,采用第一性原理计算的方法研究二氧化钛成核过程的微观机理即基于密度泛函理论(DFT)去研究。目前国内氯化法生产钛白的比例较低,对反应气体的快速混合还难以控制,对结疤的预防技术还没有掌握,生产的钛白产品与国际上其他国家生产的钛白还具有一定差距。未来,国内在钛白粉生产领域还需加大研究力度,增强国际市场竞争力。

With the development of social industrialization,titanium dioxide is widely used in industrial production due to its excellent physical and chemical properties.For example,in the fields of pigments,medical,cosmetics,semiconductors and aerospace technology.At present,the production technology of titanium dioxide mainly includes two methods:sulfuric acid method and chlorination method.Among them,the chlorination method is more in line with the double standard of economy and environmental protection.In the process of producing titanium dioxide by chlorination,the reaction between TiCl_(4)and O_(2)belongs to the millisecond extreme.Due to the fast reaction speed,it is difficult to study the reaction process from the experimental level.Therefore,the quantum chemical calculation method should be used to study its microscopic and high-speed reaction process,and the first-principles calculation method should be used to study the microscopic mechanism of the nucleation process of titanium dioxide,namely based on density functional theory(DFT).At present,the proportion of domestic production of titanium dioxide is low,the rapid mixing of reaction gas is difficult to control,the prevention technology of scarring has not been mastered,the production of titanium dioxide products and other countries in the world production of titanium dioxide also has a certain gap.In the future,domestic titanium dioxide production field needs to increase the research efforts,enhance the competitiveness of the international market.