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A High-Pressure Gas Solid Carbonation Route to Produce Vaterite

机译：高压气体固体碳化途径，用于生产Vaterite

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摘要

A novel synthetic strategy based on a high pressure gas solid reaction using urea as an additive to produce value-added CaCO3 material is reported. Results showed that at about 150 degrees C and 12 MPa the reaction attained complete carbonation with predominant spherical vaterite crystals via a self -sustained reaction. The influences of working conditions including pressure, temperature, Ca(OH)(2)/urea mass ratio, and reaction time on the mineralization process were studied. The as prepared CaCO3 powder exhibited vaterite content as high as 94.2% and a surface area up to 32.9 m(2)/g. The mechanism study showed that the highpressure CO, acted as an inhibitor for urea decomposition at high temperature besides as a reactant; the urea entrapped Ca(OH)(2) via its melt to stabilize vaterite formation by an amine functional group and initiated the carbonation process via tiny water triggered by its slight decomposition. The separation to obtain the fine product was simple and allowed high urea recovery (for example, 93.6%). The method has merits for both the high CO, utilization and production of value-added CaCO3 without discharging inorganic salts; thus, it would be an environmentally friendly and potential route for industrial application.
机译：报道了一种基于高压气体固体反应的新型合成策略，其使用尿素作为添加增值的CaCO3材料的添加剂。结果表明，在约150℃和12MPa的情况下，反应通过自我静态反应实现了具有主要球形Vaterite晶体的完全碳酸化。研究了包括压力，温度，Ca（OH）（2）/尿素质量比和矿化过程对反应时间的工作条件的影响。作为制备的CaCO 3粉末表现出高达94.2％的Vaterite含量，表面积高达32.9m（2）/ g。该机制研究表明，高压CO，作为反应物之外的高温下尿素分解的抑制剂;尿素夹住Ca（OH）（2）通过其熔体通过胺官能团稳定Vaterite形成，并通过其轻微分解引发的微小水引发碳酸化过程。获得优质产物的分离简单，允许高尿素回收（例如，93.6％）。该方法具有高CA，利用率和增值CaCO3的优点，无需排出无机盐;因此，它将是工业应用的环保和潜在的路线。

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  • 来源
    《Crystal growth & design》 |2019年第1期|共7页
  • 作者

    Rugabirwa Benoit; Murindababisha David; Wang Hongtao; Li Jun;

  • 作者单位

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem &

    Biochem Engn Natl Engn Lab Green Chem Prod Alcohols Ethers &

    E Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem &

    Biochem Engn Natl Engn Lab Green Chem Prod Alcohols Ethers &

    E Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem &

    Biochem Engn Natl Engn Lab Green Chem Prod Alcohols Ethers &

    E Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem &

    Chem Engn Dept Chem &

    Biochem Engn Natl Engn Lab Green Chem Prod Alcohols Ethers &

    E Xiamen 361005 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
  • 关键词

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