SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 44 ›› Issue (4): 115-123.DOI: 10.1016/j.cjche.2021.03.036

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Performance of a synthetic resin for lithium adsorption in waste liquid of extracting aluminum from fly-ash

Zhengguo Xu, Xiaochong Wang, Shuying Sun   

  1. National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai 200237, China
  • 收稿日期:2020-12-05 修回日期:2021-02-22 出版日期:2022-04-28 发布日期:2022-06-18
  • 通讯作者: Shuying Sun,E-mail:shysun@ecust.edu.cn
  • 基金资助:
    The research was supported by National Key Research and Development Program of China (2017YFB0603104) and Sponsored by Shanghai Pujiang Program (2019PJD011).The authors also gratefully acknowledge the financial support from the State Key Laboratory of Green Chemistry Synthesis Technology (Zhejiang University of Technology, Hangzhou 310032).

Performance of a synthetic resin for lithium adsorption in waste liquid of extracting aluminum from fly-ash

Zhengguo Xu, Xiaochong Wang, Shuying Sun   

  1. National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai 200237, China
  • Received:2020-12-05 Revised:2021-02-22 Online:2022-04-28 Published:2022-06-18
  • Contact: Shuying Sun,E-mail:shysun@ecust.edu.cn
  • Supported by:
    The research was supported by National Key Research and Development Program of China (2017YFB0603104) and Sponsored by Shanghai Pujiang Program (2019PJD011).The authors also gratefully acknowledge the financial support from the State Key Laboratory of Green Chemistry Synthesis Technology (Zhejiang University of Technology, Hangzhou 310032).

摘要: In this study, we investigated the performance of a synthetic resin for the adsorption of Li from pre-desilicated solution which is the waste liquid produced by extracting aluminum from fly ash. The adsorption kinetics and isotherms of the resin were obtained and analyzed. The saturated adsorption sites of the resin were in agreement with the quasi-second-order kinetic model. Then, the pore diffusion model (PDM) was applied to represent the lithium adsorption kinetics which confirming that the external mass is the limiting step. Moreover, we evaluated the adsorption properties of this resin in fixed-bed mode. We established a feasible extraction process for Li from strong alkaline solutions with low Li concentrations. The process parameters, such as the flow rate, initial adsorption solution concentration, water washing process, desorption agent concentration, and flow rate were studied. The desorption rate of the Li+ ions was directly proportional with the concentration of the desorption agent. The time required to accumulate Li decreased as the hydrochloric acid concentration and flow rate increased. Time of the peak appeared increased from 0.5 bed volume (BV) to 2.5 BV as the concentration was increased from 1 to 3 mol·L-1, and the peak increased from 231 to 394 mg·L-1. The resin presented good selectivity for Li+ ions and could effectively separate impurity ions from the pre-desilication solution.

关键词: Adsorption, Wastewater treatment, Lithium, Utilization of fly-ash

Abstract: In this study, we investigated the performance of a synthetic resin for the adsorption of Li from pre-desilicated solution which is the waste liquid produced by extracting aluminum from fly ash. The adsorption kinetics and isotherms of the resin were obtained and analyzed. The saturated adsorption sites of the resin were in agreement with the quasi-second-order kinetic model. Then, the pore diffusion model (PDM) was applied to represent the lithium adsorption kinetics which confirming that the external mass is the limiting step. Moreover, we evaluated the adsorption properties of this resin in fixed-bed mode. We established a feasible extraction process for Li from strong alkaline solutions with low Li concentrations. The process parameters, such as the flow rate, initial adsorption solution concentration, water washing process, desorption agent concentration, and flow rate were studied. The desorption rate of the Li+ ions was directly proportional with the concentration of the desorption agent. The time required to accumulate Li decreased as the hydrochloric acid concentration and flow rate increased. Time of the peak appeared increased from 0.5 bed volume (BV) to 2.5 BV as the concentration was increased from 1 to 3 mol·L-1, and the peak increased from 231 to 394 mg·L-1. The resin presented good selectivity for Li+ ions and could effectively separate impurity ions from the pre-desilication solution.

Key words: Adsorption, Wastewater treatment, Lithium, Utilization of fly-ash