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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (7): 623-628. 上一篇    下一篇

研究论文

镁离子存在下乙醇-水混合溶液中碳酸钙结晶行为的研究

岳林海*,1，贾志刚1，金达莱1,2，郑遗凡3，徐铸德*,1   

  1. (1浙江大学化学系 杭州 310027)
    (2浙江理工大学机械与自动控制学院 杭州 310018)
    (3浙江工业大学化学工程与材料学院 杭州 310014)
  • 投稿日期:2005-08-17 修回日期:2005-12-16 发布日期:2006-04-15
  • 通讯作者: 徐铸德

Study on the Crystallization Behavior of Calcium Carbonate in Ethanol-Water Mixed Solution in the Presence of Mg2＋

YUE Lin-Hai*,1, JIA Zhi-Gang1, JIN Da-Lai1,2, ZHENG Yi-Fan3, XU Zhu-De*,1   

  1. (1 Chemisty Department, Zhejiang University, Hangzhou 310027)
    (2 Machine and Automation Department, Zhejiang Science-Technology University, Hangzhou 310018)
    (3 College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310014)
  • Received:2005-08-17 Revised:2005-12-16 Published:2006-04-15
  • Contact: XU Zhu-De

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通过对不同反应体系中合成样品的物相及镁含量变化规律的分析, 认为水溶液中碳酸钙的结晶遵循溶解重结晶机理, 乙醇-水溶液中则以聚集重构为主, 碳酸根阴离子的溶剂化作用对碳酸钙的沉积产生显著影响. 采用XRD, IR等手段对醇水混合溶液中合成的碳酸钙样品进行分析, 认为形成了含镁方解石及具有类白云石结构的过渡相同时存在的混合物相, 醇水溶液中含镁方解石趋于白云石化.

关键词: 碳酸钙, 溶剂化作用, 溶解重结晶, 聚集重构

Through the analysis of phase and Mg content variation of samples obtained from different reaction system, we propose that the crystallization of calcium carbonate was mainly the aggregation-mediated process in the ethanol-water mixed solution and the solution-mediated process only in aqueous solution. Solvation of CO32- had obvious influence on the deposition of calcium carbonate. According to XRD and IR of deposits, it was considered that mixed phases of Mg calcite and a transitional phase which bears analogy to dolomite structure were formed. That is to say, magnesium calcite obtained from the mixed solution of ethanol-water demonstrated the dolomitization tendency.

Key words: calcium carbonate, solvation, solution-mediated process, aggregation-mediated process