Hydromagnesite with different morphologies has been synthesized using self-made nesquehonite whiskers as raw materials. The synthesized samples have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that porous rod-like hydromagnesite are generated at 328~353K and in the pH value of 9.30+0.2, while irregular flower-like and flat layered ones are synthesized in the pH values of 10.0+0.05 and 11.0+0.05, respectively. The yield of hydromagnesite improved linearly with the increase of the temperatures and solution pH values. Porous rod-like hydromagneiste crystals with good crystalline and uniform morphology are obtained when the pyrolysis time is over 60 min. Furthermore, the apparent activation energy of phase transformation is calculated to be 3.4080 kJ/mol. According to the results, the experimental data can be well described by the kinetic model, suggesting that the phase transfer rate is dependent on the temperature.


中文翻译：

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菱镁矿法合成不同形貌的菱镁矿及其动力学分析

以自制的水镁石晶须为原料合成了不同形态的菱镁矿。合成的样品已通过X射线衍射（XRD）和扫描电子显微镜（SEM）进行了表征。结果表明，多孔棒状菱镁矿产生于328〜353K，p H值为9.30 + 0.2，而合成的不规则花状和平层状pH值为10.0 + 0.05和11.0 + 0.05 ， 分别。菱镁矿的产率随温度和溶液p的增加线性增加。H值。当热解时间超过60min时，获得具有良好晶体和均匀形态的多孔棒状氢化镁晶体。此外，相变的表观活化能经计算为3.4080kJ / mol。根据结果​​，动力学模型可以很好地描述实验数据，表明相转移速率取决于温度。