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In situ spectroscopic studies of decomposition of ZrSiO4 during alkali fusion process using various hydroxides

机译：用各种氢氧化物的碱融合过程中Zrsio4分解的原位光谱研究

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摘要

ZrSiO4 powder synthesized by the sol-gel method is used to study the reaction mechanism of natural zircon mineral treated by an alkali fusion method. The reaction processes are analyzed by in situ Raman spectroscopy. Other characterization experiments using techniques, such as FTIR spectroscopy, TG-DTA and X-ray powder diffraction complement and verify the Raman spectroscopy study. The results reveal that hydroxylation-dehydration play important roles during the alkali-fusion process. Hydroxylation action breaks some bonds between Si and O in silicon-oxygen tetrahedral and releases zircon as ZrO2 and silanol groups and then dehydration makes SiO4 tetrahedron polymerize to the silicate with different lattice structure. The electron-donating ability of the O atom in molten alkali determines the number of Si-O bonds broken in SiO4 tetrahedral and the lattice structure of silicate products. Finally, with further development of the reaction, the bridge-oxygen bonds of intermediate products are substitutes for non-bridging-oxygen bonds.
机译：通过溶胶 - 凝胶法合成的ZrSiO4粉末用于研究通过碱融合方法处理天然锆石矿物的反应机理。通过原位拉曼光谱分析反应过程。使用技术的其他表征实验，例如FTIR光谱，TG-DTA和X射线粉末衍射补体并验证拉曼光谱研究。结果表明，羟基化 - 脱水在碱融合过程中起重要作用。羟基化作用在硅氧四面体中的Si和O之间存在一些键，释放锆石作为ZrO 2和硅烷醇基，然后脱水使SiO 4使SiO 4与不同的晶格结构聚合到硅酸盐中。 O原子在熔融碱中的电子给予能力决定了SiO 4四面体和硅酸盐产品的晶格结构中破碎的Si-O键的数量。最后，随着反应的进一步发展，中间产物的桥氧键是非桥接 - 氧键的代替。

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  • 来源
    《RSC Advances》 |2015年第15期|共9页
  • 作者

    Wang Zirui; Xu Qian; Xu Min; Wang Shuo; You Jinglin;

  • 作者单位

    Northeastern Univ Sch Mat Sci &

    Met Shenyang 110004 Peoples R China;

    Shanghai Univ Sch Mat Sci &

    Engn Shanghai 200072 Peoples R China;

    Northeastern Univ Sch Mat Sci &

    Met Shenyang 110004 Peoples R China;

    Northeastern Univ Sch Mat Sci &

    Met Shenyang 110004 Peoples R China;

    Shanghai Univ Sch Mat Sci &

    Engn Shanghai 200072 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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