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›› 2010, Vol. 10 ›› Issue (2): 287-291.

• 反应与分离 • 上一篇    下一篇

改型斜发沸石在Na+-Ca2+-Mg2+和NH4+-Ca2+-Mg2+水溶液体系中的离子交换平衡

袁俊生 杨磊   

  1. 天津市河北工业大学化工学院 天津市河北工业大学化工学院
  • 收稿日期:2010-01-12 修回日期:2010-03-23 出版日期:2010-04-20 发布日期:2010-04-20
  • 通讯作者: 袁俊生

Ion Exchange Equilibria between the Modified Clinoptilolite and Aqueous Solutions of Na+-Ca2+-Mg2+ and NH4+-Ca2+-Mg2+ Systems

YUAN Jun-sheng YANG Lei   

  1. Dept. Chem. Eng. Hebei University of Technology Dept. Chem. Eng. Hebei University of Technology
  • Received:2010-01-12 Revised:2010-03-23 Online:2010-04-20 Published:2010-04-20
  • Contact: YUAN Jun-sheng

摘要: 研究了Na+-Ca2+-Mg2+与钠型斜发沸石和NH4+-Ca2+-Mg2+与铵型斜发沸石的离子交换平衡,分别测定出2个体系的离子交换平衡数据,并利用三维坐标绘制出三元离子交换平衡等温面,计算出改型沸石对体系中离子的分离因数. 结果表明,在Na+-Ca2+-Mg2+溶液体系中,Na+的分离因数>10,Ca2+的在0.4~10之间,Mg2+的小于0.4,斜发沸石离子交换顺序为Na+>Ca2+>Mg2+,且温度升高Ca2+和Mg2+的交换能力增强,而低温则有利于沸石对Na+的选择;在NH4+-Ca2+-Mg2+溶液体系中,NH4+的分离因数>15,Ca2+的在0.2~1.5之间,Mg2+的小于0.2,斜发沸石离子交换顺序为NH4+>Ca2+>Mg2+,且温度升高Ca2+和Mg2+的交换能力增强,NH4+的选择性降低.

关键词: 改型斜发沸石, 钠, 铵, 钙, 镁, 离子交换平衡

Abstract: The ion exchange equilibria between the modified clinoptilolite and the ternary solution systems of Na+-Ca2+-Mg2+ and NH4+-Ca2+-Mg2+ were investigated. The ion exchange equilibrium data of the above systems were measured respectively. Based on the experimental results, the ion exchange isothermic surfaces were constructed using three-dimensional coordinates, and the ternary separation factors of the systems calculated. The results show that the separation factors of Na+ is over 10, Ca2+ between 0.4 and 10, and Mg2+ below 0.4 in the Na+-Ca2+-Mg2+ system, therefore the ion exchange selective sequences of the clinoptilolite is Na+>Ca2+>Mg2+, and higher temperature is in favor of the selectivity of the zeolite to Ca2+ and Mg2+, but lower temperature is propitious to the adsorption of the zeolite to Na+. The separation factor of NH4+ is over 15, Ca2+ between 0.2 and 1.5, and Mg2+ below 0.2 in the NH4+-Ca2+-Mg2+ system, so the ion exchange selective sequences of the clinoptilolite is NH4+>Ca2+>Mg2+, and higher temperature is in favor of the selectivity of the zeolite to Ca2+ and Mg2+, otherwise lower temperature is propitious to the adsorption of the zeolite to NH4+.

Key words: modified clinoptilolite, sodium, ammonium, calcium, magnesium, ion exchange equilibrium

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