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INVESTIGATION OF THE THERMAL DECOMPOSITION OF TALC

机译：滑石粉热分解的研究

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摘要

Different changes in the structural and thermal properties of various types of talc have been reported in the literature which have made comparison of analytical results difficult. The objective of the present study was to obtain some fundamental insights into the effects of the thermal behavior of talc and to carry out kinetic analyses of the decomposition of talc under high temperature. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetry-differential scanning calorimetry (TG-DSC) were used to study the thermal decomposition mechanism. The Coats-Redfern decomposition model was used to determine the decomposition mechanism of talc samples. The results showed that the decomposition of talc commenced at ～800℃, peaking at ～895℃, with the formation of enstatite and amorphous silica. An isothermal treatment at 1000℃ caused the complete dehydroxylation of talc. The XRD and FTIR results indicated that the enstatite and amorphous silica phases were transformed into clinoenstatite and paracrystalline opal phases, respectively, after the decomposition stage at 1200℃. Good linearity in the Coats-Redfern model was observed from room temperature to 1300℃ and the activation energy was calculated to be 69 kcal/mol.
机译：在文献中已经报道了各种类型的滑石的结构和热性质的不同变化，这使得比较分析结果变得困难。本研究的目的是获得对滑石热行为的影响的一些基本见解，并对滑石在高温下的分解进行动力学分析。利用X射线衍射（XRD），傅立叶变换红外光谱（FTIR）和热重-差示扫描量热法（TG-DSC）研究了热分解机理。用Coats-Redfern分解模型确定滑石样品的分解机理。结果表明，滑石粉的分解在〜800℃开始，在〜895℃达到峰值，形成顽辉石和无定形二氧化硅。在1000℃下等温处理使滑石完全脱羟基。 XRD和FTIR结果表明，在1200℃分解后，顽辉石和无定形硅石相分别转变为斜铁辉石和顺晶蛋白石相。从室温到1300℃，在Coats-Redfern模型中观察到良好的线性，活化能经计算为69 kcal / mol。

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  • 来源
    《Clays and clay minerals》 |2014年第2期|137-144|共8页
  • 作者

    Xiaowen Liu; Xiaoxu Liu; Yuehua Hu;

  • 作者单位

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;

    School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Activation Energy; Coats-Redfern; Thermal Decomposition; Talc;

    机译：活化能;高士-雷德芬热分解;滑石;

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