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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (19): 2313-2318. 上一篇    下一篇

研究论文

电磁处理对水溶液中碳酸钙微粒沉降及附着性能的影响

葛红花*，位承君，龚晓明，徐学敏，陶洁婷，姚秀平   

  1. (上海电力学院 上海热交换系统节能工程技术研究中心 上海高校电力腐蚀控制与应用电化学重点实验室 上海 200090)
  • 投稿日期:2011-02-09 修回日期:2011-05-03 发布日期:2011-06-10
  • 通讯作者: 葛红花 E-mail:honghge@sohu.com
  • 基金资助:

    2008上海市重点科技攻关项目;2010上海市重点科技攻关项目;2009上海市技术标准专项;2010上海市技术标准专项

Effect of Electromagnetic Treatment on Sedimentation and Adhesion Behavior of Calcium Carbonate Particles Formed in Aqueous Solution

GE Hong-Hua, WEI Cheng-Jun, GONG Xiao-Ming, XU Xue-Min, TAO Jie-Ting, YAO Xiu-Ping   

  1. (Shanghai University of Electric Power, Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai Key Laboratory of Colleges and Universities for Corrosion Control in Electric Power System and Applied Electrochemistry, Shanghai 200090)
  • Received:2011-02-09 Revised:2011-05-03 Published:2011-06-10

PDF

1583

被引次数

34

通过Zeta电位、表面自由能及其分量、粘附功等热力学参数的测定与分析, 研究了电磁处理对等物质的量Na2CO3与CaCl2溶液混合生成的碳酸钙微粒的沉积特性及阻垢机理. 结果显示电磁处理可以使碳酸钙微粒的Zeta电位绝对值减小约5 mV, 同时加快碳酸钙微粒的沉降速度. 经电磁处理生成的碳酸钙微粒的表面自由能为31.59 mJ•m－2, 比未经处理时减小30%, 同时表面自由能Lifshitz-van der Waals分量从处理前的43.53 mJ•m－2下降到25.50 mJ•m－2, 说明成垢溶液的电磁处理可以提高碳酸钙微粒的热力学稳定性. 水溶液中碳酸钙微粒与316L不锈钢表面之间的理论粘附功计算显示, 电磁处理降低了该理论粘附功, 使碳酸钙微粒在不锈钢表面的附着能力下降.

关键词: 电磁处理, 阻垢, 碳酸钙, Zeta电位, 表面自由能, 粘附功

The sedimentation behavior and scale inhibition mechanism of CaCO3 particles freshly precipitated from equimolar Na2CO3 and CaCl2 solution after electromagnetic treatment were studied by measurement and analysis of Zeta potentials, surface free energy and theoretical work of adhesion. It was found that the absolute value of Zeta potential of CaCO3 decreased by about 5 mV, and the sedimentation rate of particles sped up after electromagnetic treatment. The surface free energy of CaCO3 particles formed after electromagnetic treatment is 31.59 mJ•m－2 which decreased by about 30%, and the Lifshitz-van der Waals component are 43.53 mJ•m－2 and 25.50 mJ•m－2 for the untreated and treated particles respectively, showing that CaCO3 particles became more thermodynamically stable after treatment. The theoretical work of adhesion between electromagnetically treated CaCO3 particles and 316L stainless steel in aqueous solution was lower than that of the untreated samples, and deposition of the electromagnetically treated CaCO3 on the surface of stainless steel was less.

Key words: electromagnetic water treatment, antiscale, calcium carbonate, Zeta potential, surface free energy, theoretical work of adhesion

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