| 碳酸钙自发沉淀析出的动力学研究 |
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| 引用本文： | 李广兵,方健,李杰.碳酸钙自发沉淀析出的动力学研究[J].环境化学,2001,20(1):12-17. |
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| 作者姓名： | 李广兵 方健 李杰 |
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| 作者单位： | 同济大学物理系, |
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| 基金项目： | 国家自然科学基金资助重点项目,批准号:59738150 |
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| 摘 要： | 通过记录析晶过程中溶液各组份随时间的变化关系,研究了不同过饱和度的碳酸钙水溶液的沉淀动力学过程．实验结果显示,异相成核是主导的成核机制．通过实验数据计算出了表面二维晶核的棱自由能为２．５３ × １０－８ｍＪ·ｍ－１．实验数据表明,碳酸钙晶体生长的过程是扩散控制过程．
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| 关 键 词： | 碳酸钙 二维晶核棱自由能 扩散控制 结晶动力学 换热器 水垢 自发沉淀析出 |
THE STUDY OF THE KINETIC PROCESSES OF SPONTANEOUS PRECIPITATION FOR CALCIUM CARBONATE SUPERSATURATED AQUEOUS SOLUTION |
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| Li Guangbing,Fang Jian,Li Jie.THE STUDY OF THE KINETIC PROCESSES OF SPONTANEOUS PRECIPITATION FOR CALCIUM CARBONATE SUPERSATURATED AQUEOUS SOLUTION[J].Environmental Chemistry,2001,20(1):12-17. |
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| Authors: | Li Guangbing Fang Jian Li Jie |
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| Abstract: | By recording the time variation of the concentration of the species in the solution during preci-pitation, we studied the kinetic precipitation processes of calcium carbonate supersaturation solu-tion . Our experimental results implied that the hetero-nucleation is the main nucleation mechanism. The free edge energy of the surface two-dimentional nucleus could also be determined from the ex-perimental data, and yielded a value of 2.53 x 10-8mJ ?m-1. The experimental data also indicated that the growth of crystal is controlled by diffusion mechanism. |
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| Keywords: | calcium carbonate precipitation diffusion controll kinetics of precipitation free edge energy |
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