有色金属科学与工程2025，Vol.16Issue(2)：192-202,11.DOI:10.13264/j.cnki.ysjskx.2025.02.004
磷酸锂体系中D401螯合树脂对Ca2+、Mg2+的吸附机理及行为
Adsorption mechanism and behavior of D401 chelating resin on Ca2+and Mg2+in lithium phosphate system
摘要
Abstract
The crude lithium phosphate,a by-product of salt lakes,cannot be used as a lithium source for synthesizing lithium iron phosphate due to excessive calcium and magnesium impurities.After the preliminary precipitation to remove impurities,the content of impurity calcium and magnesium is still not up to the standard,and the removal difficulty of calcium and magnesium increases.In this regard,this paper simulated the same proportion of lithium phosphate solution system and studied the adsorption effect of D401 chelating resin on calcium and magnesium by thermodynamics and kinetics.It was found that D401 chelating resin had a high selectivity for calcium and magnesium in the phosphate system,and the adsorption process belonged to single molecular layer adsorption and could be spontaneous.It conformed to the quasi-second-order kinetic model and was controlled by micro-particle diffusion and chemical reactions.When the flow rate of the dynamic adsorption solution was 12 BV/h,the removal rates of Ca and Mg were 66.67%and 70.25%,respectively,and the loss rate of lithium was 1.22%.This study has an important reference value for the deep removal of Ca and Mg impurities in lithium phosphate by D401 chelating resin.关键词
磷酸锂/等温吸附模型/吸附动力学/离子交换/除杂Key words
lithium phosphate/isothermal adsorption model/adsorption kinetics/ion exchange/impurity removal分类
化学工程引用本文复制引用
杜金晶,马嘉艺,李小鹏,王东博,冯笑,朱军,左恒,王斌..磷酸锂体系中D401螯合树脂对Ca2+、Mg2+的吸附机理及行为[J].有色金属科学与工程,2025,16(2):192-202,11.基金项目
陕西省科技厅区域创新能力引导计划资助项目(2022QFY10-05) （2022QFY10-05）
陕西省"两链融合"校企联合重点专项(2022LL-JB-09) （2022LL-JB-09）
