方解石诱导结晶生长动力学影响因素研究  

Factors Influencing the Growth Kinetics of Calcite Induced Crystallization

作　　者：刘泽男 胡瑞柱 黄廷林[1,2,3] LIU Ze-nan;HU Rui-zhu;HUANG Ting-lin(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Environmental Engineering,Xi’an 710055,China;Northwest China Key Laboratory of Water Resources and Environment Ecology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]陕西省环境工程重点实验室,陕西西安710055 [3]西北水资源与环境生态教育部重点实验室,陕西西安710055

出　　处：《中国给水排水》2021年第11期76-83,共8页China Water & Wastewater

基　　金：国家重点研发计划项目(2016YFC0400706)。

摘　　要：利用pH-stat法研究了过饱和度、pH值、离子强度和CMg对方解石诱导结晶生长速率的影响。结果表明:方解石线性生长速率与过饱和度、pH值呈正相关关系,相关系数分别为0.979和0.828,方解石线性生长速率为(0.1~3)×10^(-10)m/s。离子强度为0.01~0.15 mol/L时,增加离子强度可以促进方解石生长,当离子强度超过0.15 mol/L时,增加离子强度对方解石线性生长速率不再产生影响。过饱和度有可能是通过影响溶液中碳酸钙分子CaCO_(3(aq))的浓度间接影响方解石线性生长速率,而pH值则是通过影响游离钙离子[Ca^(2+)]o的方式来影响。Mg^(2+)对方解石生长有明显的抑制作用,通过SEM图发现,CMg∶CCa=1.5时,会对方解石表面结构产生影响,XRD图谱表明,方解石晶型中出现了霰石。Effects of supersaturation,pH,ionic strength and CMg on calcite induced crystallization growth rate were investigated by using pH-stat method.The linear growth rate of calcite was positively correlated with supersaturation and pH,which was(0.1-3)×10^(-10)m/s,and the correlation coefficients were 0.979 and 0.828,respectively.When the ionic strength was 0.01-0.15 mol/L,increasing ionic strength could promote the growth of calcite,while it had no influence on the linear growth rate of calcite with ionic strength over 0.15 mol/L.Supersaturation might indirectly affect the linear growth rate of calcite by affecting the concentration of CaCO_(3(aq))in the solution,while pH affected the linear growth rate of calcite by affecting the free calcium ion[Ca^(2+)]o.Mg^(2+)had an obvious inhibitory effect on calcite growth.SEM figures showed that the surface structure of calcite would be affected when the ratio of CMg and CCa was 1.5.XRD images showed that aragonite appeared in the calcite crystal.

关 键 词：方解石 异相结晶 结晶生长速率 PH-STAT 动力学 

分 类 号：TU992[建筑科学—市政工程]