| 摘要: |
| 为了高附加值利用电石渣以及封存CO2，以电石渣为原料、甘氨酸（Gly）为添加剂，在常压下采用电石渣-CO2反应法制备了高纯度球形球霰石碳酸钙.通过扫描电子显微镜和X射线衍射仪等研究了Gly掺量对球霰石含量的影响以及球霰石的稳定性，并探讨了球霰石的形成机理及滤液中Gly的循环利用.结果表明：球霰石的含量随着Gly掺量的增加呈先增加后减少的趋势；制备的球霰石具有良好的热稳定性；在球霰石的形成过程中，碳酸钙由方解石和小针状文石晶体通过团聚、溶解和沉淀转化为表面有粗糙突起的球形球霰石；滤液中的Gly可以循环利用且不影响球霰石的含量；电石渣-CO2反应法是一种简便、低成本、少污染制备球霰石的新工艺. |
| 关键词: 球霰石 甘氨酸 电石渣 二氧化碳 |
| DOI：10.3969/j.issn.1007-9629.2023.08.015 |
| 分类号:TQ172 |
| 基金项目:国家自然科学基金资助项目（U1905216） |
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| Process and Mechanism of Vaterite Calcium Carbonate Preparation from Calcium Carbide Slag |
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LI Yubei, LIU Songhui, ZHU Jianping, ZHAO Ruiqi, GUAN Xuemao
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School of Materials Science and Engineering， Henan Polytechnic University， Jiaozuo 454003， China
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| Abstract: |
| To make high valued use of calcium carbide slag and to sequester CO2， high purity spherical vaterite calcium carbonate was prepared by carbonation method using calcium carbide slag as raw material and glycine （Gly） as an additive. The process of calcium carbide slag-CO2 reaction was under atmospheric pressure.The effects of Gly doping on the content of product vaterite and the stability of vaterite were investigated by scanning electron microscopy and X-ray diffraction， and the mechanism of vaterite formation and the recycling of Gly in filtrate were discussed. The results show that the content of vaterite tends to increase and then decrease with the increase of Gly doping. The prepared vaterite has good thermal stability. During the formation of vaterite， calcium carbonate is converted from calcite and small needle-like aragonite crystals by agglomeration， dissolution and precipitation to spherical vaterite with rough protrusions on the surface. Gly in the filtrate can be recycled for the preparation of vaterite without affecting the content of vaterite. The calcium carbide slag-CO2 reaction method is a simple， low-cost and less polluting new process for the preparation of vaterite. |
| Key words: vaterite glycine carbide slag CO2 |
