Adsorption equilibrium, kinetics, and dynamic separation of Ca2+ and Mg2+ ions from phosphoric acid–nitric acid aqueous solution by strong acid cation resin

作     者：Rui Lü Qing Xi Tan Li Rui Li Xiaochao Zhang Jianxin Liu Caimei Fan Junqiang Feng Lingyun Zhang ZhihuaWang 

作者机构：College of Chemistry and Chemical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shenzhen Batian Ecological Engineering Co.Ltd.Shenzhen 518057China Tianji Coal Chemical Group Co.Ltd.Changzhi 047507China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2019年第27卷第12期

页      面：2930-2936页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 070304[理学-物理化学(含∶化学物理)] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Supported by a grant from Tianji Coal Chemical Group Co.Ltd.(Project no.2012-1978) Shenzhen Batian Ecological Engineering Co.,Ltd.(Project no.2013-0909). 

主　　题：Ca2+and Mg2+ions Strong acid cation resin Adsorption equilibrium Kinetics Dynamic separation 

摘      要：The separation of Ca2+and Mg2+ions from phosphoric acid-nitric acid aqueous solution is very significant for the neutralization process of nitrophosphate fertilizer.This paper studied the adsorption equilibrium,kinetics,and dynamic separation of Ca2+and Mg2+ions by strong acid cation resin,and the effects of phosphoric acid and nitric acid on the adsorption process were investigated.The results reveal that the adsorption process of Ca2+and Mg2+ions in pure water on resin is in good agreement with the Langmuir isotherm model and their maximal adsorption capacities are 1.86 mmol·g-1 and 1.83 mmol·g-1,respectively.The adsorption kinetics of Ca2+and Mg2+ions on resin fits better with the pseudo-first-order model,and the adsorption equilibrium in pure water is reached within 10 min contact time,while at the present of phosphoric acid,the adsorption rate of Ca2+and Mg2+ions on resin will go down.The dynamic separation experiments demonstrate that the designed column adsorption is able to undertake the separation of metal ions from the mix acids aqueous solution,but the dynamic operation should control the flow rate of mix acid solution.Besides nitric acid solution was proved to be effective to completely regenerate the spent resin and achieve the recyclable operation of separation process.