文献类型：期刊文献

英文题名：Formation Mechanism of Rutile in Sulfate Process

作者：Wang, Zinan[1]; Chen, Kui[1]; Zhu, Jiawen[1]; Zhou, Xiaokui[2]; Lin, Farong[2]

机构：[1] School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, China; [2] Sichuan Lomon Corporation, Mianzhu, Sichuan, China

年份：2019

卷号：562

期号：1

外文期刊名：IOP Conference Series: Materials Science and Engineering

收录：EI(收录号：20193707437641)

语种：英文

外文关键词：Oxide minerals - Sulfur compounds - Thermoanalysis - Thermodynamic stability - Calcination - Field emission microscopes - Dehydration - Scanning electron microscopy - Desulfurization - Grain boundaries

摘要：In the sulfate process for the production of TiO2 white pigments, amorphous metatitanic acid is calcined to microcrystals of the rutile polymorph by experiencing the dehydration, desulfurization, crystallization into anatase and the phase transformation from anatase to rutile (ART). Surface structure and thermal stability of metatitanic acid was characterized by Simultaneous Thermal Analyzer (STA) and FTIR Spectrometer. Powder X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) were used to describe the changes of phase composition and granule morphology. It was found that Free SO42- ions and S=O asymmetric structure existed on the surface of metatitanic acid as well as H2O with various adsorption state. The calcination intensity has a much stronger impact on crystallinity's increase than dehydration, desulfurization. The temperature region of phase transform was 900～1000°C. Rutile would not appear until amorphous metatitanic acid has crystallized into anatase completely and the anatase grain was in a slow growth before that. It was also found that particles were mutually merged by means of fusion of grain boundaries. ? Published under licence by IOP Publishing Ltd.