Abstract: The influences of electrostatic water treatment on crystallization behavior and crystal forms of CaCO₃ were investigated by using non-evaporation method.A stable stage existed in the early stage of the CaCO₃ crystallization in the water sample treated by electrostatic field, and the length of the stage was affected remarkably by temperature.For instance, the stage lasted 3 h at 60℃, but less than 0.5 h at 80℃.The results of SEM and IR show that the content of aragonite increases in the scale sample formed in the electrostatic water.The appearance of the stable stage and aragonite is because H₂O molecules and HCO₃^- are polarized by electrostatic field and their reactivity increases.The results of the static and dynamic scale inhibition experiments prove obvious synergistic scale inhibition effect between the electrostatic water treatment and polyepoxysuccinic acid(PESA).With PESA in the electrostatic water, the static scale inhibition rate reaches 95.8%, which is 18.9% higher than that in the prepared water, and the dynamic scale inhibition rate is 92.1%, which is 14.5% higher than that in the groundwater.

Key words: electrostatic water treatment, polyepoxysuccinic acid, synergistic scale inhibition effect, scale inhibition mechanism

摘要： 使用非蒸发浓缩法研究了静电场对碳酸钙结晶过程及晶型的影响。研究发现经静电处理后,碳酸钙结晶过程初期晶体生长速度缓慢,存在一个稳定期,这个稳定期的长短受温度影响很大。60℃时稳定期可达3 h,当温度升高到80℃后,稳定期缩短到0.5 h内。SEM和IR分析结果表明,经静电处理后,水垢中文石型碳酸钙的含量增加。晶体稳定期和文石型碳酸钙的出现主要是因为,高压静电场导致水分子和HCO₃^-极化变形,使得二者的极性增加,反应活性增强。静态阻垢实验和动态阻垢实验结果表明,静电水处理和聚环氧琥珀酸(PESA)之间存在明显的协同阻垢效应。PESA在静电水中的静态阻垢率可达95.8%,比在配制水中的提高了18.9%;动态阻垢率为92.1%,阻垢率提高了14.5%。

关键词: 静电水处理, 聚环氧琥珀酸, 协同阻垢效应, 阻垢机理