煅燒二氧化鈦粒度的影響
(四川大學(xué) 化工學(xué)院，成都 610065)
摘 要: 介紹在硫酸氧鈦水解過程初期引入超聲波輻照， 采用透射電子顯微鏡、 X射線衍射儀和激光粒度測試技術(shù)對水解產(chǎn)物—水合二氧化鈦及其在650 ℃的煅燒產(chǎn)物二氧化鈦進(jìn)行表征。 結(jié)果表明：超聲波輻照作用不僅促進(jìn)了硫酸氧鈦的水解過程而且使水解產(chǎn)物的晶格參數(shù)發(fā)生改變， 特別是銳鈦型四方晶胞的c軸從0.951 4 nm縮短到0.918 1 nm， 同時, 晶胞體積縮小， 晶粒度減小。 在煅燒以后， c軸伸長明顯使原有的晶格畸變消失。與未受超聲波輻照的水解產(chǎn)物不同， 受過超聲波作用的水合二氧化鈦在煅燒之后其平均顆粒度減小的趨勢達(dá)10％， 從水合二氧化鈦的0.712 μm減小為0.639 μm。
關(guān)鍵字: 鈦液水解； 超聲波輻照； 水合二氧化鈦； 晶體畸變
（ 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
