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

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

doi: 10.7513/j.issn.1004-7638.2023.04.004
  • Received Date: 2023-04-04
  • Publish Date: 2023-08-30
  • 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.
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