仿生碳化中天冬氨酸对碳酸钙晶型和形貌的影响

发布时间：2018-03-11 19:20

  本文选题：球霰石型碳酸钙　切入点：碳化反应　出处：《无机盐工业》2017年03期 　论文类型：期刊论文

【摘要】：采用天冬氨酸(Asp)作为晶型诱导剂,采用碳化法合成了球霰石型碳酸钙。研究了二氧化碳通气速率、反应温度、天冬氨酸浓度对碳酸钙晶型和形貌的影响,通过X射线衍射(XRD)、扫描电镜(SEM)、激光粒度仪分析了产物的晶型特征。结果表明,二氧化碳通气速率对碳酸钙的晶型几乎没有影响,仅影响颗粒的形貌,其中球霰石物质的量分数达到95%,团聚颗粒尺寸随着二氧化碳通气速率的增加而增大;反应温度对碳酸钙晶型的影响较小,对颗粒的形貌、尺寸没有影响,在低温段(20℃)形成的球霰石物质的量分数约为96%,随着温度升高至60℃球霰石物质的量分数降低至87%;天冬氨酸的浓度显著影响碳酸钙的晶型,天冬氨酸浓度越低球霰石含量越低,并且碳酸钙颗粒的形貌由球形逐渐转变为针状,其尺寸也逐渐减小。研究结果对球霰石型碳酸钙的工业化生产提供了较好的借鉴。
[Abstract]:The crystal type calcium carbonate was synthesized by carbonation with aspartic acid Aspp. The effects of carbon dioxide ventilation rate, reaction temperature and aspartic acid concentration on the morphology and morphology of calcium carbonate were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle size analyzer (LPMs) were used to analyze the crystal structure of the product. The results showed that the aeration rate of carbon dioxide had little effect on the crystal morphology of calcium carbonate, but only the morphology of the particles. The particle size increased with the increase of the aeration rate of carbon dioxide, and the reaction temperature had little effect on the crystal form of calcium carbonate, but had no effect on the morphology and size of the particles. At 20 鈩，

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