全球三大盐酸法钛白制备工艺及进展分析

Preparation Technology and Progress Analysis in the Global Three Major Titanium Dioxide Process by Hydrochloric Acid

介绍了全球盐酸法钛白的三大主要制备工艺:美国ANI法、加拿大CTL法和中国ZLC法。通过对各自工艺特点的对比认为,美国ANI工艺和加拿大的CTL工艺是以钛元素萃取为目标,而中国的ZLC工艺是通过萃取铁元素来达到对钛元素的有效分离。此外,还对上述三大主要盐酸法钛白工艺的优劣势及应用情况进行了分析和阐述,并结合现有研发实际,分别从废酸、成本、设备选择以及产品品质4个方面指出了盐酸法钛白工艺有待解决的问题。通过分析认为,目前盐酸法工艺尚不成熟,无论哪种盐酸法钛白工艺,均仍处于开发阶段。该领域呈现出不仅盐酸酸解的钛液质量不好,无法达到稳定生产颜料钛白的目标,而且其工艺技术装备、经济性和成本等问题也还有待验证的局面。

The global three major processes of titanium dioxide by hydrochloric acid,American ANI,Canadian CTL and Chinese ZLC were introduced.Comparing the characteristics of the three processes,it is believed that the American ANI process and the Canadian CTL process are aimed at extracting titanium,while the Chinese ZLC process achieves effective separation of titanium by extracting iron.In addition,the advantages and disadvantages of these above processes and their application states were analyzed and elaborated.Combined with the current research and development practice,the hydrochloric acid process is still bottlenecked from four aspects:waste acid,cost,equipment selection and the quality of product,which believed that the current hydrochloric acid process is still immature,and no matter which hydrochloric acid process to produce titanium dioxide,it is still in the development stage.Not only the quality of the hydrolyzed titanium solution by hydrochloric acid is not good that fails to achieve the goal of stable production of titanium dioxide pigment,but also the equipment,economy and cost still need to be verified.