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首页> 外文期刊>Crystal growth & design >Calcium Carbonate Particle Formation through Precipitation in a Stagnant Bubble and a Bubble Column Reactor
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Calcium Carbonate Particle Formation through Precipitation in a Stagnant Bubble and a Bubble Column Reactor

机译：通过沉淀在停滞气泡和泡沫柱反应器中的碳酸钙粒子形成

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摘要

The precipitation of CaCO3 via CO2 bubbling using well-defined membranes was used in this study to produce particles of a variety of structures. Studies into the mechanisms of particle formation via this method are limited and are mainly specific to hollow structures. Using a range of analytical techniques, particles produced with a stagnant bubble and in bubbling systems (crossflow and vertical flow) were investigated. The stagnant bubble work concluded that the particles are produced both in bulk but also at the gas/liquid interface which then fall down and collect at the base of the bubble, whereas in a dynamic system the bubble wake has an important role in precipitation of such particles. Precipitation occurs as the solution pH drops due to CO2 bubbling (acidic gas), and these particles are initially comprised of a solid core. As the pH drops further, these particles transform to ones with a hollow core and the pH plays an important role in controlling the particle shell thickness. Allowing the particles to age in solution allows for transformation of such particles from vaterite to calcite. Finally, the particle structure can also be altered by changing the bubbling set up as having a recirculation loop leading to the formation of particles exhibiting a stacked cube.
机译：在本研究中使用使用过明确鉴定的膜来沉淀CaCO 3的沉淀，用于产生各种结构的颗粒。通过该方法研究颗粒形成的机制是有限的，主要是空心结构。研究了一种分析技术，研究了用停滞气泡和鼓泡系统（交叉流动和垂直流动）产生的颗粒。停滞的气泡作品得出结论，颗粒在散装中制造，而且在气体/液体界面上产生，然后在气泡底部下降并收集，而在动态系统中，泡沫唤醒在沉淀中具有重要作用粒子。由于CO 2鼓泡（酸性气体）引起的溶液pH下降而发生沉淀，并且这些颗粒最初由固体核心组成。当pH进一步下降时，这些颗粒转变为具有中空核的颗粒，并且pH在控制颗粒壳厚度方面发挥重要作用。允许颗粒在溶液中达到年龄允许将这些颗粒从Vaterite转化为方解石。最后，还可以通过改变具有再循环回路的鼓泡设施来改变颗粒结构，导致形成堆叠立方体的颗粒的形成。

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  • 来源
    《Crystal growth & design》 |2020年第8期|共11页
  • 作者

    Grimes Christopher J.; Hardcastle Thomas; Manga Mohamed S.; Mahmud Tariq; York David W.;

  • 作者单位

    Univ Leeds Sch Chem &

    Proc Engn Fac Engn &

    Phys Sci Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem &

    Proc Engn Fac Engn &

    Phys Sci Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem &

    Proc Engn Fac Engn &

    Phys Sci Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem &

    Proc Engn Fac Engn &

    Phys Sci Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem &

    Proc Engn Fac Engn &

    Phys Sci Leeds LS2 9JT W Yorkshire England;

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