镁离子存在下乙醇-水混合溶液中碳酸钙结晶行为的研究  

Study on the Crystallization Behavior of Calcium Carbonate in Ethanol-Water Mixed Solution in the Presence of Mg^(2+)

作　　者：岳林海[1] 贾志刚[1] 金达莱[1,2] 郑遗凡[3] 徐铸德[1] 

机构地区：[1]浙江大学化学系 [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

出　　处：《化学学报》2006年第7期623-628,共6页Acta Chimica Sinica

摘　　要：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.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 CO3^2- 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.

关 键 词：碳酸钙 溶剂化作用 溶解重结晶 聚集重构 

分 类 号：O614.231[理学—无机化学]