An anion-exchange-based chromatographic separation approach was developed to selectively recover zinc and copper from the high-chlorine raffinate generated in the process of germanium chlorination distillation using 7...An anion-exchange-based chromatographic separation approach was developed to selectively recover zinc and copper from the high-chlorine raffinate generated in the process of germanium chlorination distillation using 717 resins based on the coordination difference between Zn^(2+)/Cu^(2+)and Cl^(-).The theoretical calculation and spectroscopic analyses suggested that the coordination between Zn^(2+)and Cl^(-)is much stronger than that between Cu^(2+)and Cl^(-),and the Cl-concentration significantly affects Zn(Ⅱ)and Cu(Ⅱ)species.The factors involving Cl-concentration,resin dosage,shaking speed,and temperature were investigated to determine the optimal condition,and the maximum separation factor of Zn/Cu reached as high as 479.2.The results of the adsorption isotherms,adsorption kinetics,SEM,FTIR,and XPS analyses indicated that the process followed the monolayer uniform chemisorption.Through the continuous adsorption experiments,Zn(Ⅱ)and Cu(Ⅱ)in the high-chlorine raffinate were separately recovered,allowing the reuse of residual waste acid and germanium.展开更多
针对目前废旧磷酸铁锂电池正极材料回收中仅局限于高经济价值的锂元素提取,由于铝杂质分离困难而导致提锂渣利用率低的问题,提出了一种基于“铜粉强化硫酸浸出-铁粉置换-选择性分铝”策略的湿法工艺,旨在从提锂渣中高效再生磷酸铁。通...针对目前废旧磷酸铁锂电池正极材料回收中仅局限于高经济价值的锂元素提取,由于铝杂质分离困难而导致提锂渣利用率低的问题,提出了一种基于“铜粉强化硫酸浸出-铁粉置换-选择性分铝”策略的湿法工艺,旨在从提锂渣中高效再生磷酸铁。通过对铜粉强化硫酸过程进行优化及动力学研究,着重考察了铜粉用量、硫酸用量、液固比、反应温度及反应时间等参数的影响,确定了铁粉置换回收铜和选择性分铝过程的相关优化参数。研究结果表明,铜粉强化提锂渣硫酸浸出过程符合混合扩散控制模型,其表观活化能为37.12 k J·mol^(-1),主要受溶液边界层的扩散和界面处的化学反应共同控制。此外,经过净化处理后,溶液中铜和铝的浓度分别降至小于1、41 mg·L^(-1),可直接用于电池级磷酸铁的制备。本研究为磷酸铁锂提锂渣的回收利用提供了一种新思路。展开更多
基金financially supported by the Postdoctoral Research Foundation of Central South University,China(No.140050037)。
文摘An anion-exchange-based chromatographic separation approach was developed to selectively recover zinc and copper from the high-chlorine raffinate generated in the process of germanium chlorination distillation using 717 resins based on the coordination difference between Zn^(2+)/Cu^(2+)and Cl^(-).The theoretical calculation and spectroscopic analyses suggested that the coordination between Zn^(2+)and Cl^(-)is much stronger than that between Cu^(2+)and Cl^(-),and the Cl-concentration significantly affects Zn(Ⅱ)and Cu(Ⅱ)species.The factors involving Cl-concentration,resin dosage,shaking speed,and temperature were investigated to determine the optimal condition,and the maximum separation factor of Zn/Cu reached as high as 479.2.The results of the adsorption isotherms,adsorption kinetics,SEM,FTIR,and XPS analyses indicated that the process followed the monolayer uniform chemisorption.Through the continuous adsorption experiments,Zn(Ⅱ)and Cu(Ⅱ)in the high-chlorine raffinate were separately recovered,allowing the reuse of residual waste acid and germanium.
文摘针对目前废旧磷酸铁锂电池正极材料回收中仅局限于高经济价值的锂元素提取,由于铝杂质分离困难而导致提锂渣利用率低的问题,提出了一种基于“铜粉强化硫酸浸出-铁粉置换-选择性分铝”策略的湿法工艺,旨在从提锂渣中高效再生磷酸铁。通过对铜粉强化硫酸过程进行优化及动力学研究,着重考察了铜粉用量、硫酸用量、液固比、反应温度及反应时间等参数的影响,确定了铁粉置换回收铜和选择性分铝过程的相关优化参数。研究结果表明,铜粉强化提锂渣硫酸浸出过程符合混合扩散控制模型,其表观活化能为37.12 k J·mol^(-1),主要受溶液边界层的扩散和界面处的化学反应共同控制。此外,经过净化处理后,溶液中铜和铝的浓度分别降至小于1、41 mg·L^(-1),可直接用于电池级磷酸铁的制备。本研究为磷酸铁锂提锂渣的回收利用提供了一种新思路。
