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Volume 24 Issue 8
Aug.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(8): 954-963
Gui-hua Liu, Zheng Li, Xiao-bin Li, Tian-gui Qi, Zhi-hong Peng, and Qiu-sheng Zhou, Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 954-963. https://doi.org/10.1007/s12613-017-1483-5
Cite this article as:
Gui-hua Liu, Zheng Li, Xiao-bin Li, Tian-gui Qi, Zhi-hong Peng, and Qiu-sheng Zhou, Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 954-963. https://doi.org/10.1007/s12613-017-1483-5
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研究论文Open Access

Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed

  • School of Metallurgy and Environment, Central South University, Changsha 410083, China

  • 通讯作者:

    Zheng Li    E-mail: lizhengtctc@163.com

  • The precipitation of spherical boehmite was studied by surface energy calculations, measurements of precipitation ratios, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The surface energy calculation results show that the (001) and (112) planes of gibbsite surfaces are remarkably stable because of their low surface energies. In addition, the (010) plane of boehmite grows preferentially during precipitation because of its low surface energy. Thus, we propose a method to precipitate spherical boehmite from a supersaturated sodium aluminate solution by adding gibbsite as seed in a heterogeneous system. In this method, gibbsite acts as the preliminary seed and saturation modifier. The results show that the fine boehmite first nucleates on the (001) and (112) planes of gibbsite and then grows vertically on the (001) and (112) basal planes of gibbsite via self-assembly, thereby forming spherical boehmite. Simultaneously, gibbsite is dissolved into the aluminate solution to maintain the saturation for the precipitation of boehmite. The precipitation ratio fluctuates (forming an M-shaped curve) because of gibbsite dissolution and boehmite precipitation. The mechanism of boehmite precipitation was further discussed on the basis of the differences in surface energy and solubility between gibbsite and boehmite. This study provides an environmentally friendly and economical method to prepare specific boehmite in a heterogeneous system.
    • Research ArticleOpen Access

    Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed

    + Author Affiliations
      Abstract
    • The precipitation of spherical boehmite was studied by surface energy calculations, measurements of precipitation ratios, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The surface energy calculation results show that the (001) and (112) planes of gibbsite surfaces are remarkably stable because of their low surface energies. In addition, the (010) plane of boehmite grows preferentially during precipitation because of its low surface energy. Thus, we propose a method to precipitate spherical boehmite from a supersaturated sodium aluminate solution by adding gibbsite as seed in a heterogeneous system. In this method, gibbsite acts as the preliminary seed and saturation modifier. The results show that the fine boehmite first nucleates on the (001) and (112) planes of gibbsite and then grows vertically on the (001) and (112) basal planes of gibbsite via self-assembly, thereby forming spherical boehmite. Simultaneously, gibbsite is dissolved into the aluminate solution to maintain the saturation for the precipitation of boehmite. The precipitation ratio fluctuates (forming an M-shaped curve) because of gibbsite dissolution and boehmite precipitation. The mechanism of boehmite precipitation was further discussed on the basis of the differences in surface energy and solubility between gibbsite and boehmite. This study provides an environmentally friendly and economical method to prepare specific boehmite in a heterogeneous system.
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