水和水蒸气辅助粗晶三水铝石转化为勃姆石的机制研究
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P571;P579

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国家自然科学基金资助项目(U1501231)


The transformation mechanism of the macrogranular gibbsite to boehmite assisted by water and water vapor
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    摘要:

    在165℃、175℃、185℃和195℃的温度条件下,对水热处理前和处理后的粗晶三水铝石样品分别进行了XRD分析和SEM表征,研究了粗晶三水铝石在水蒸气和热水中转变成勃姆石的相变过程。结果表明,水热条件下粗晶三水铝石转化成勃姆石的过程受控于溶解-再沉淀机制,而并非是通常认为的固体状态下的转变;相对于在热水中,水蒸气环境可以加速三水铝石向勃姆石的转化;所形成的勃姆石的粒径(4~7 μm)明显比前驱体三水铝石的粒径(120~200 μm)要小得多,表明可以利用粗晶三水铝石生产微晶勃姆石。在转化过程中,勃姆石微晶首先生长在三水铝石的晶体表面上,通过控制反应温度和反应时间,可形成壳层为勃姆石、壳下为三水铝石的具有双层结构的铝的氢氧化物颗粒,也有可能形成具有中空结构的勃姆石集合体颗粒。

    Abstract:

    The transformation of well-crystallized macrogranular gibbsite to boehmite has been studied by hydrothermal method, at 165℃, 175℃, 185℃ and 195℃ for 12 h, respectively. Samples have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) before and after autoclaving. The transformation of gibbsite to boehmite is a dissolution-precipitation mechanism, rather than a solid-state process. The rate of transformation of gibbsite to boehmite in water vapour was faster than the rate in water. The size of obtained boehmite crystal (4~7 μm) reduced to thirtieth of the macrogranular gibbsite (120~200 μm), indicating that well-crystallized macrogranular gibbsite can be used to produce particulate boehmite. Because boehmite firstly crystallized on the outside surface of gibbsite particles during the period of gibbsite to boehmite, which keep the pseudomorphism of gibbsite particles with the double-layer structure, the hydroxide particles of aluminum were obtained by controlling the temperature and reaction time. Moreover, the hollow particles of boehmite aggregation were perhaps formed.

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陈博,陈小明,蒋学鑫,2021,水和水蒸气辅助粗晶三水铝石转化为勃姆石的机制研究[J].岩石矿物学杂志,40(6):1197~1202.

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  • 收稿日期:2021-02-11
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  • 在线发布日期: 2021-11-15
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