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›› 2005, Vol. 5 ›› Issue (5): 499-503.

• 反应与分离 • 上一篇    下一篇

用201×7强碱性阴离子交换树脂回收氰化物

廖赞,朱国才,兰新哲,王文忠   

  1. 清华大学核能与新能源研究院
  • 出版日期:2005-10-20 发布日期:2005-10-20

Recovery of Cyanide with 201′7 Strongly Basic Anion Exchange Resin

LIAO Zan,ZHU Guo-cai,LAN Xin-ze,WANG Wen-zhong   

  1. Institute of Nuclear and New Energy Technology, Tsinghua University
  • Online:2005-10-20 Published:2005-10-20

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摘要： 研究了201′7树脂对氰化物的吸附解吸性能，考察了pH值、温度、氰化物浓度等对吸附的影响，确定了最佳吸附条件为：pH 10~11，室温，静态吸附振荡15 min，并选择中性NaCl作为解吸剂，取得了良好的解吸效果. 确定了湿树脂对氰化物的静态饱和吸附容量为25.39 mg/mL，动态饱和吸附容量为27.43 mg/mL. 探讨了201′7树脂对氰化物吸附的热力学及动力学规律，确定了吸附和解吸的速率常数分别为1.01′10-2和2.12′10-2 s-1. 吸附过程符合Freundlish经验等温式. 通过实验初步确定该树脂可用于氰化物回收及处理.

关键词: 阴离子交换树脂, 氰化物, 吸附, 解吸

Abstract: The adsorption and elution performances of 201′7 strongly basic anion exchange resin for cyanide were studied, and the influences of pH value, temperature and concentration were also examined. The optimum conditions for cyanide adsorption were determined under pH value between 10 to 11, room temperature and batch-wise operation for 15 min. A neutral strippant NaCl was selected for NaCN elution. The results show that the capacity of batch saturated adsorption for cyanide is 25.39 mg/mL, and the dynamic saturation is 27.43 mg/mL. The thermodynamics and kinetics of 201′7 basic anion exchange resin for adsorption of cyanide were investigated. The rate constants of adsorption and elution are k=1.01′10-2 and k=2.12′10-2 s-1 respectively. And the adsorption process is consistent with the Freundli equation. The results illustrate that 201′7 basic anion exchange resin can be used for recovery and disposal of cyanide in waste water.

Key words: anion exchange resin, cyanide, adsorption, elution