磷酸锂体系中D401螯合树脂对Ca^(2+)、Mg^(2+)的吸附机理及行为  

Adsorption mechanism and behavior of D401 chelating resin on Ca^(2+) and Mg^(2+) in lithium phosphate system

作　　者：杜金晶[1] 马嘉艺 李小鹏 王东博 冯笑 朱军[1] 左恒 王斌[1] DU Jinjing;MA Jiayi;LI Xiaopeng;WANG Dongbo;FENG Xiao;ZHU Jun;ZUO Heng;WANG Bin(College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shanxi Wuzhou Mining Group,Shangluo 726000,Shanxi,China)

机构地区：[1]西安建筑科技大学冶金工程实验室,西安710055 [2]陕西五洲矿业股份有限公司,陕西商洛726000

出　　处：《有色金属科学与工程》2025年第2期192-202,共11页Nonferrous Metals Science and Engineering

基　　金：陕西省科技厅区域创新能力引导计划资助项目(2022QFY10-05);陕西省“两链融合”校企联合重点专项(2022LLJB-09)。

摘　　要：盐湖副产物粗制磷酸锂因杂质钙镁含量超标而无法充当合成磷酸铁锂的锂源,并且经过初步沉淀除杂后,杂质钙镁含量仍不达标,钙镁的去除难度随之增大。对此,本文模拟同等比例磷酸锂溶液体系,利用热力学和动力学研究D401螯合树脂对其中的钙镁的吸附效果,发现D401螯合树脂对磷酸盐体系中的钙镁具有较高的选择性吸附,吸附过程属于单分子层吸附、可自发进行,且符合准二级动力学模型、受微观颗粒内扩散和化学反应协同控制;当动态吸附溶液流速为12 BV/h时,钙镁去除率分别为66.67%、70.25%,锂损失率为1.22%,该研究对D401螯合树脂深度脱除磷酸锂中的钙镁杂质具有重要参考价值。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 

分 类 号：TQ131.11[化学工程—无机化工] TF19[冶金工程—冶金物理化学]