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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Dynamic and controlled rate thermal analysis of attapulgite
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Dynamic and controlled rate thermal analysis of attapulgite

机译：凹凸棒土的动态和控制速率热分析

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摘要

The thermal decomposition of the clay mineral attapulgite has been studied using a combination of dynamic and controlled rate thermal analysis. In the dynamic experiment two dehydration steps are observed over the 20–114 and 114–201°C temperature range. In the dynamic experiment three dehydroxylation steps are observed over the temperature ranges 201–337, 337–638 and 638–982°C. The CRTA technology enables the separation of the thermal decomposition steps. Calculations show the amount of water in the attapulgite mineral is variable. Dehydration in the CRTA experiment occurs as quasi-isothermal equilibria. Dehydroxylation occurs as a series of non-isothermal decomposition steps. CRTA technology offers better resolution and a more detailed interpretation of the decomposition processes of a clay mineral such as attapulgite via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of non-isothermal nature reveal partial collapse of the layers of attapulgite as the attapulgite is converted to an anhydride.
机译：结合动态和控制速率热分析，研究了粘土矿物凹凸棒石的热分解。在动态实验中，在20–114和114–201°C温度范围内观察到两个脱水步骤。在动态实验中，在201-337、337-638和638-982°C的温度范围内观察到三个脱羟基步骤。 CRTA技术可实现热分解步骤的分离。计算表明，凹凸棒石矿物中的水量是可变的。 CRTA实验中的脱水以准等温平衡发生。脱羟基反应是一系列非等温分解步骤。 CRTA技术通过消除热量向样品的缓慢传递作为分解过程的控制参数，通过接近分解的平衡条件，为粘土矿物（如凹凸棒石）的分解过程提供了更好的分辨率和更详细的解释。非等温性质的恒定速率分解过程显示，随着凹凸棒石转化为酸酐，凹凸棒石层的部分塌陷。

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  • 来源
    《Journal of Thermal Analysis and Calorimetry》 |2008年第2期|589-594|共6页
  • 作者

    Veronika Vágv?lgyi; Lisa M. Daniel; Caroline Pinto; J. Kristóf; R. L. Frost; Erzsébet Horváth;

  • 作者单位

    Department of Analytical Chemistry University of Pannonia H8201 Veszprém PO Box 158 Hungary;

    Inorganic Materials Research Program School of Physical and Chemical Sciences Queensland University of Technology 2 George Street GPO Box 2434 Brisbane Queensland 4001 Australia;

    Inorganic Materials Research Program School of Physical and Chemical Sciences Queensland University of Technology 2 George Street GPO Box 2434 Brisbane Queensland 4001 Australia;

    Department of Analytical Chemistry University of Pannonia H8201 Veszprém PO Box 158 Hungary;

    Inorganic Materials Research Program School of Physical and Chemical Sciences Queensland University of Technology 2 George Street GPO Box 2434 Brisbane Queensland 4001 Australia;

    Department of Environmental Engineering and Chemical Technology University of Pannonia 8201 Veszprém PO Box 158 Hungary;

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  • 正文语种 eng
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  • 关键词

    attapulgite; CRTA; palygorskites; sepiolite; thermal analysis; thermogravimetry;

    机译：凹凸棒石;CRTA;滑石粉;海泡石;热分析;热重分析;

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