Inorganic Chemicals Industry >
Effects of crystal seeds and salt dopants on phase transformation of TiO2 in calcination process
Received date: 2019-09-26
Online published: 2020-03-31
In order to investigate the effect of crystal seeds and compound salt dopants on the phase transformation of TiO2 crystal forms in calcination process of the titanium dioxide production by sulfuric acid method,the dehydration and desulfation in calcination process,changes of phase,composition of crystal form and granule morphology were analyzed by using the means of thermogravimetry differential thermal analysis（TG-DTA）,powder X-ray diffraction（XRD） and scanning electron microscopy（SEM）.Results showed that the metatitanic acid（MTA） experienced crystallization process from amorphous to anatase in order to transform to rutile crystal.It was found that calcined crystal seeds and salt dopants can effectively expand the temperature range of phase transformation from the range of 900~1 000 ℃ to the range of 850~1 050 ℃.The calcined crystal seeds promoted the phase transformation and reduced the starting point of phase transformation temperature by about 50 ℃.The salt dopants inhibited the size of crystal seeds at 800~900 ℃.After 900 ℃,the inhibition on the growth of crystal seeds was weakened.The phase transformation range was expanded and the crystal morphology was adjusted.It′s helpful in adjusting the crystal morphology,improving the particle size distribution and reducing the sinter ing degree.
Zinan Wang , Kui Chen , Jiawen Zhu , Yurong Zhang , Farong Lin , Xiaokui Zhou . Effects of crystal seeds and salt dopants on phase transformation of TiO2 in calcination process[J]. Inorganic Chemicals Industry, 2020 , 52(3) : 45 -50 . DOI: 10.11962/1006-4990.2019-0210
| [1] | 陈朝华, 刘长河 . 钛白粉生产及应用技术[M]. 北京: 化学工业出版社, 2005. |
| [2] | Hanaor D A H, Sorrell C C . Review of the anatase to rutile phase tr-ansformation[J]. Journal of Materials Science, 2011,46(4):855-874. |
| [3] | 黄超, 邓磊, 黄琼 , 等. 二氧化钛光催化剂降解气相苯系物的研究进展[J]. 无机盐工业, 2017,49(1):56-59. |
| [4] | 张宏忠, 张钰, 王明花 , 等. 二氧化钛光催化膜分离耦合技术在水处理中的应用[J]. 无机盐工业, 2017,49(7):50-54. |
| [5] | 唐波, 许妍霞, 宋兴福 , 等. 钛白酸解尾渣旋流分级数值模拟与实验研究[J]. 华东理工大学学报:自然科学版, 2016,42(4):454-459. |
| [6] | 朱容梅, 陈葵, 朱家文 , 等. 外加晶种对钛白粉水解过程及其亮度的影响[J]. 无机盐工业, 2019,51(2):30-34. |
| [7] | 刘翔, 朱家文, 陈葵 , 等. 钛液水解工艺对金红石型二氧化钛亮度的影响[J]. 无机盐工业, 2015,47(11):34-37. |
| [8] | 容尔益, 朱家文, 陈葵 , 等. 煅烧晶种和磷、镁对二氧化钛晶体的影响[J]. 无机盐工业, 2016,48(7):21-24. |
| [9] | Grzmil B, Kic B, Rabe M . Inhibition of the anatase-rutile phase trans-formation with addition of K2O,P2O5,and Li2O[J]. Chemical Papers, 2004,58(6):410-414. |
| [10] | Gesenhues U, Rentschler T . Crystal growth and defect structure of Al 3+-doped rutile [J]. Journal of Solid State Chemistry, 1999,143(2):210-218. |
| [11] | Takeuchi M, Martra G, Coluccia S , et al. Investigations of the struc-ture of H2O clusters adsorbed on TiO2 surfaces by near-infrared absorption spectroscopy[J]. The Journal of Physical Chemistry B, 2005,109(15):7387-7391. |
| [12] | Herman G S, Dohnálek Z, Ruzycki N , et al. Experimental investi-gation of the interaction of water and methanol with anatase-TiO2(101)[J]. The Journal of Physical Chemistry B, 2003,107(12):2788-2795. |
| [13] | Ginsberg T, Modigell M, Wilsmann W . Thermochemical characte-rization of the calcination process step in the sulphate method for production of titanium dioxide[J]. Chemical Engineering Research and Design, 2011,89(7):990-994. |
| [14] | 杨青 . Al盐对钛白粉窑下物形貌和颜料性能的影响[J]. 化工管理, 2017(33):85-86. |
/
| 〈 |
|
〉 |