Study on Preparation of TiO2 from Aqueous TiCl4 Solution by Pyrohydrolysis
-
摘要: 以四氯化钛水化得到的TiOCl2溶液为原料,在常压下采用自生晶种热水解法制备TiO2晶体粉末。在初始TiOCl2溶液中Ti4+浓度为0.5 mol/L,温度106℃(沸腾)条件下反应120 min得到的产物,通过X-射线衍射分析证明是金红石、锐钛矿和板钛矿3种晶型粉末的混合物。并且在煅烧过后可以得到纯的金红石型TiO2。试验考察了Ti4+浓度、反应时间、反应温度对产物粒度的影响。发现Ti4+浓度为0.5 mol/L,反应时间120 min产物粒径最小;并且当反应温度降低,粒径变小。Abstract: Taking TiOCl2 solution prepared by hydration of TiCl4 as raw material,crystalline TiO2powder was prepared by pyrohydrolysis of self-generating seed crystal under a pressure of 1 atm. With Ti4+ concentration in the initial TiOCl2 solution of 0.5 mol/L,after reaction at 106℃ for 120 min,the product obtained was proved to be a mixture of rutile,anatase and brookite powder by X-ray diffraction analysis. And pure rutile TiO2 powder could be prepared after calcination. The influence of the concentration of Ti4+ and reaction temperature and time on size distribution of the products was investigated. It can be concluded that with Ti4+ concentration of 0.5 mol/L and reaction time of 120 min,TiO2 power with minimum particle size can be obtained,and as the hydrolysis temperature reduces,the TiO2 particle size becomes smaller.
-
Key words:
- titanium tetrachloride /
- titanium dioxide /
- pyrohydrolysis /
- particle size distribution
点击查看大图
计量
- 文章访问数: 32
- HTML全文浏览量: 7
- PDF下载量: 3
- 被引次数: 0