Citation: Shi Chunyang, Xie Gang, Wang Ying, Yu Xiaohua. Preparation of Ultrafine Flaky α-Al₂O₃ by Modified Bayer Process[J]. Chemistry, ;2019, 82(12): 1098-1103. shu

Preparation of Ultrafine Flaky α-Al₂O₃ by Modified Bayer Process

Shi Chunyang ¹ ,
Xie Gang ^1,2 ,
Wang Ying ³ ,
Yu Xiaohua ^1,,

1.
Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093
2.
State Key Laboratory of Common Associated Non-Ferrous Metal Resources Pressure Hydrometallurgy Technology, Kunming 650503
3.
Guiyang Aluminum Magnesium Design & Research Institute Co., Ltd., Guiyang 550081

Corresponding author: Yu Xiaohua, yxhyxh1978@aliyun.com
Received Date: 6 July 2019
Accepted Date: 6 August 2019

Figures(6)

In order to optimize the metallurgical grade alumina production process, the modified Bayer process is used to produce more profitable flake α-Al₂O₃. The flaky α-Al₂O₃ was prepared by degumming sodium aluminate solution, strengthening the carbon concentration of spherical seed crystals, deep dehydrogenation under hydrothermal conditions and calcination under AlF₃ conditions. The composition, phase and morphology of the product were analyzed by XRF, XRD and SEM. The results showed that when the addition of industrial aluminum hydroxide, calcium oxide and sodium oxalate are 45 g/L, 10 g/L and 10 g/L respectively, impurity iron, silicon, magnesium, zinc and calcium are reduced to (1.5, 5.0, 1.8, 1.5, 5.2)×10^-5, respectively. Adding a small amount of spherical seed crystals in the carbonization, the decomposition rate of the solution reaches 92% or more, and the product particle size is reduced and evenly distributed. Lowering the pH in dehydrogenation during hydrothermal deepening can promote the conversion of gibbsite to boehmite more thoroughly. When 2% AlF₃ seed crystals were added, the washed hydrothermal product was calcined at 850℃ for 4 h, the ultrafine flaky α-Al₂O₃ with a purity of more than 99.96% and a regular morphology can be obtained.
- Modified bayer method,
- Deeply reducing impurity,
- Enhanced carbon,
- Hydrothermal sodium removal,
- Flaky α-Al₂O₃
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Preparation of Ultrafine Flaky α-Al₂O₃ by Modified Bayer Process