Study on the effect and mechanism of Al<sup>3+ </sup>during the calcination of metatitanic acid

Lu Ruifang; Yang Fang; Liu Chan; Hao Lin

doi:10.7513/j.issn.1004-7638.2023.04.004

Volume 44 Issue 4

Aug. 2023

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Lu Ruifang, Yang Fang, Liu Chan, Hao Lin. Study on the effect and mechanism of Al3+ during the calcination of metatitanic acid[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 25-32. doi: 10.7513/j.issn.1004-7638.2023.04.004

Citation:

Lu Ruifang, Yang Fang, Liu Chan, Hao Lin. Study on the effect and mechanism of Al³⁺during the calcination of metatitanic acid[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 25-32. doi: 10.7513/j.issn.1004-7638.2023.04.004

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Study on the effect and mechanism of Al³⁺during the calcination of metatitanic acid

doi: 10.7513/j.issn.1004-7638.2023.04.004

Lu Ruifang^{1, 2
,
,},
Yang Fang¹,
Liu Chan¹,
Hao Lin³

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
3.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received Date: 2023-04-04
Publish Date: 2023-08-30

Abstract

Abstract

In the production of titanium dioxide by sulfate process, obtaining rutile titanium dioxide with suitable particle size through different salt treatments and high-temperature calcination of metatitanic acid is the basis for preparing titanium pigments. Aluminum salt treatment is currently one of the commonly used salt treatment systems, but the mechanism of aluminum salt in the calcination process is still unclear. In this study, the intermediate material in the production of titanium dioxide by sulfate process, metatitanic acid after second washing, was used as raw material, and only aluminum sulfate was used as salt treatment agent. The material was calcined in a muffle furnace at a temperature of 800-950 ℃. The effects of Al³⁺on the crystal transformation and particle growth of TiO₂ during the calcination process were studied using XRD, SEM, HRTEM, and other analytical methods. The results show that different amounts of aluminum salts and calcination temperatures have significant effects on the crystal transformation, particle growth, and existence form of Al³⁺ in TiO₂. When the amount of aluminum salt is low, Al³⁺ is doped into the TiO₂ lattice in a substitution mode, displacing Ti⁴⁺, reducing the crystal cell volume and shortening the internal bond length of the crystal, which is not conducive to the atomic rearrangement and bond breaking processes, leading to a decrease in the crystalline transformation rate. And with the increase of the amount of aluminum salt added, excessive Al³⁺ exists as Al₂O₃ on the TiO₂ surface. At the same time, with the increase of the amount of aluminum salt added, the particle size of anatase or rutile TiO₂ obtained at the same calcination temperature decreases.
- titanium dioxide,
- metatitanic acid,
- Al ion doping,
- crystal transformation

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References(13)

References

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