首页|Microscale spherical TiO2 powder prepared by hydrolysis of TiCl4 solution:Synthesis and kinetics

Microscale spherical TiO2 powder prepared by hydrolysis of TiCl4 solution:Synthesis and kinetics

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Hydrolysis of TiCI4 solution is capable of preparing microscale TiO2 particles.This research studied the synthesis of microscale spherical TiO2 powders and the hydrolysis kinetics.The effects of the flow field generated by different agitators and baffles in the crystallizer,the initial free acid concentration,the initial equivalent TiO2 concentration,and the temperature on the hydrolysis progress and powder morphology were systematically studied.The results show that the flow field in a crystallizer can significantly affect the morphology and particle size of the powders,and the axial flow can improve the sphericity of the powders.The increased free HCl and equivalent TiO2 concentrations in the pregnant solution inhibit the forward hydrolysis reaction,prolong the time to reach equilibrium,and reduce the yield.An appropriate temperature matching the compositions of the pregnant solution is crucial for the powder morphology and size.Powders with sizes ranging from around 5 um-40 μm can be tuned under controlled flow field,solution compositions,and temperature conditions.In addition,the Cheng and Wunderlich modified Avrami equation was used for the crystallization kinetic modeling.The effects of the free HCl concentration,equivalent TiO2 concentration,and hydrolysis temperature are reflected in the reaction rate constant and active nuclei reduction index.Increasing the free HCl and equivalent TiO2 concentrations will reduce the reaction rate constant and accelerate the deactivation of the active nuclei,thus increasing the final powder size,while increasing the temperature will lead to the opposite results.

TiCl4HydrolysisMicroscale TiO2SphericalKinetics

Peiyi Yan、Ying Zhang、Shili Zheng

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School of Rare Earths,University of Science and Technology of China,Hefei,230026,China

Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341119,China

Key Laboratory of Green Process and Engineering,National Engineering Research Center of Green Recycling for Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences,Beijing,100190,China

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua,617000,China

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Key Research Program of the Chinese Academy of SciencesYouth Innovation Promotion Association CASNational Natural Science Foundation of ChinaBeijing Natural Science FoundationState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization

ZDRW-CN-2021-32018065517711792192056

2024

10.1016/j.partic.2023.03.004

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.84(1)
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