电磁处理对水溶液中碳酸钙微粒沉降及附着性能的影响  

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

作　　者：葛红花[1] 位承君[1] 龚晓明[1] 徐学敏[1] 陶洁婷[1] 姚秀平[1] 

机构地区：[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

出　　处：《化学学报》2011年第19期2313-2318,共6页Acta Chimica Sinica

基　　金：上海市重点科技攻关项目(Nos.08DZ2201400;10DZ2210400);上海市技术标准专项(No.10DZ0500300);上海市教委科创重点项目(No.12ZZ173)资助

摘　　要：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.The sedimentation behavior and scale inhibition mechanism of CaCO3 particles freshly precipi-tated from equimolar Na2CO3 and CaCl2 solution after electromagnetic treatment were studied by measure-ment 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 parti-cles sped up after electromagnetic treatment.The surface free energy of CaCO3 particles formed after elec-tromagnetic treatment is 31.59 mJom-2 which decreased by about 30%,and the Lifshitz-van der Waals component are 43.53 mJom-2 and 25.50 mJom-2 for the untreated and treated particles respectively,showing that CaCO3 particles became more thermodynamically stable after treatment.The theoretical work of adhe-sion 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.

关 键 词：电磁处理 阻垢 碳酸钙 ZETA电位 表面自由能 粘附功 

分 类 号：TQ085.4[化学工程]