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    顾燕芳, 王松, 胡黎明, 张爱忠. 超细CaCO_3合成过程中的形态控制[J]. 华东理工大学学报（自然科学版）, 1993, (5).
    引用本文: 顾燕芳, 王松, 胡黎明, 张爱忠. 超细CaCO_3合成过程中的形态控制[J]. 华东理工大学学报（自然科学版）, 1993, (5).
    shu
    Morphology Control in Preparing CaCO_3 Ultrafine Particles[J]. Journal of East China University of Science and Technology, 1993, (5).
    Citation: Morphology Control in Preparing CaCO_3 Ultrafine Particles[J]. Journal of East China University of Science and Technology, 1993, (5).
    shu

    超细CaCO_3合成过程中的形态控制

    Morphology Control in Preparing CaCO_3 Ultrafine Particles

      摘要
    • 摘要: 利用电导率仪及pH计跟踪Ca(OH)_2碳化反应过程。研究结果表明:高浓度Ca(OH)_2悬浮液吸收CO_2形成CaCO_3的过程中,反应前期过程速率受CO_2吸收控制,反应末期受Ca(OH)_2的溶解控制,其中吸收控制为整个过程的关键步骤。利用TEM及X衍射分析研究了超细CaCO_3的成核生长机理,探讨了CaCO_3粒子均相成核形成非晶态CaCO_3,并与Ca(OH)_2结合形成线性中间体,而后转变成方解石晶型CaCO_3粒子的过程。考察了添加剂的作用机理,提出添加剂能促进CaCO_3粒子的成核过程,阻止粒子的凝并生长。实验成功地合成出不同形态的超细CaCO_3粒子。

       

      Abstract: The carbonation of lime suspension were measured in situ by using conductivity gauge and pH meter. The results showed that the carbonation rate was controlled by the absorption of CO_2 at the initial period, which was the most important stage in the overall process. Finally, it turned to be controlled by dissolution of Ca(OH)_2. TEM and X-ray diffraction were used to observe the nucleation and growth of CaCO_3 ultrafine particles. The effects of additives were discussed. It was concluded that the additive enhanced nucleation and prevented the agglomeration and grow of CaCO_3 particle. Ultrafine CaCO_3 products with different morphology were synthesized successfully.

       

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