摘要
本文采用EDTA容量滴定法测定pH>1环境下,D2EHPA-HCl-HAc体系萃取Nd(Ⅲ)过程两相中的Nd浓度来考察溶液pH值和萃取剂D2EHPA浓度对Nd分配比的影响,通过红外光谱测试对负载Nd的D2EHPA以及D2EHPA-HCl-HAc萃取体系有机相进行分析来研究D2EHPA-HCl-HAc体系对Nd(Ⅲ)的萃取机理,并确定萃取平衡常数。结果为,当pH>1时,D2EHPA-HCl-HAc体系对Nd(Ⅲ)萃取过程的实质是Nd(Ⅲ)与P-OH基团发生置换,过程遵循阳离子交换机制,同时与P=O基团发生络合配位作用。并得出萃取平衡常数KNd为100.28。
By volumetric precipitation method of EDTA,Nd concentration in two phases of D2EHPA-HCl-HAc extraction system is determined in the conditions of pH 1 for studying the effect on distribution ratio of Nd by the variety of acidy and extractant concentration.Furthermore,by infrared spectrum testing and analysis of D2EHPA and the organic phase loading Nd,the effect on extraction mechanism of Nd in D2EHPA-HCl-HAc extraction system by acidy is also studied.Whereby,the extraction equilibrium constant can be calculated.The results show that displacement reaction between Nd（Ⅲ） and P-OH happens and the extraction process abide by cation exchange mechanism in the condition of pH〉1.Nd（Ⅲ） and P= O also do coordination complex action at the same time.And extraction equilibrium constant KNd is 100.28.
出处
《矿冶》
CAS
2011年第1期43-46,共4页
Mining And Metallurgy
