煅烧二氧化钛粒度的影响
(四川大学 化工学院，成都 610065)
摘 要: 介绍在硫酸氧钛水解过程初期引入超声波辐照， 采用透射电子显微镜、 X射线衍射仪和激光粒度测试技术对水解产物—水合二氧化钛及其在650 ℃的煅烧产物二氧化钛进行表征。 结果表明：超声波辐照作用不仅促进了硫酸氧钛的水解过程而且使水解产物的晶格参数发生改变， 特别是锐钛型四方晶胞的c轴从0.951 4 nm缩短到0.918 1 nm， 同时, 晶胞体积缩小， 晶粒度减小。 在煅烧以后， c轴伸长明显使原有的晶格畸变消失。与未受超声波辐照的水解产物不同， 受过超声波作用的水合二氧化钛在煅烧之后其平均颗粒度减小的趋势达10％， 从水合二氧化钛的0.712 μm减小为0.639 μm。
关键字: 钛液水解； 超声波辐照； 水合二氧化钛； 晶体畸变
（ College of Chemical Engineering, Sichuan University, Chengdu 610065, China）
Abstract: An experimental investigation on titanium sulfate solution hydrolysis under ultrasonic irradiation was introduced, the hydrolysis product, hydrated titanium dioxide, and obtained titanium dioxide by calcining the former at 650 ℃ were characterized using TEM, XRD and particle size measurement by laser. The experimental results show that the hydrolysis process is promoted and the crystal lattice structure of the hydrated titanium dioxide from ultrasonic irradiation is changed, c axle of anatase tetragonal crystal is shortened from 0.9514 nm to 0.9181 nm, the cell volume becomes small and the crystallite size becomes small at the same time. After calcination the lattice parameter c grows obviously and the old crystal lattice distortion disappears. As contrasted with the hydrolysis product that is not irradiated by ultrasonic wave, the mean particle size of titanium dioxide irradiated by ultrasonic wave in hydrolysis stage becomes small by 10%, from 0.712 μm of hydrated titanium dioxide particle to 0.639 μm of calcined titanium dioxide particle.
Key words: titanium hydrolysis; ultrasonic irradiation; hydrated titanium dioxide; crystal lattice distortion
