用201×7强碱性阴离子交换树脂回收氰化物  

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

作　　者：廖赞[1] 朱国才[1] 兰新哲[2] 王文忠[2] 

机构地区：[1]清华大学核能与新能源研究院,北京102201 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《过程工程学报》2005年第5期499-503,共5页The Chinese Journal of Process Engineering

基　　金：国家863计划资助项目(编号:2003AA32X090)

摘　　要：研究了201X7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.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.

关 键 词：阴离子交换树脂 氰化物 吸附 解吸 

分 类 号：TQ425.23[化学工程] X756[环境科学与工程—环境工程]