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

作　　者：Zhengguo Xu Xiaochong Wang Shuying Sun 

机构地区：[1]National Engineering Research Center for Integrated Utilization of Salt Lake Resource,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第4期115-123,共9页中国化学工程学报（英文版）

基　　金：supported by National Key Research and Development Program of China(2017YFB0603104);Sponsored by Shanghai Pujiang Program(2019PJD011);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 predesilicated 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 to3 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 

分 类 号：X703[环境科学与工程—环境工程] TQ322.4[化学工程—合成树脂塑料工业] O647.3[理学—物理化学]