Recovery of waste rare earth fluorescent powders by two steps acid leaching

作     者：Shen-Gen Zhang Min Yang Hu Liu De-An Pan Jian-Jun Tian 

作者机构：Institute of Advanced Materials and Technology School of Materials Science and Engineering University of Science and Technology Beijing 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2013年第32卷第6期

页      面：609-615页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Hi-Tech R&D Program of China (No. 2012AA063202) National Key Project of Scientific and Technical Support Program of China (Nos. 2011BAE13B07, 2012BAC02B01, and 2011BAC10B02) National Natural Science Foundation of China (Nos. 51174247 and 50972013) 

主　　题：Waste rare earth fluorescent powders Two steps acid leaching Alkali fusion 

摘      要：The effects of the acid leaching and alkali fusion on the leaching efficiency of Y,Eu,Ce,and Tb from the waste rare earth fluorescent powders were investigated in this *** results show that hydrochloric acid is better than sulfuric acid in the first acid leaching,and NaOH is better than Na2CO3in the alkali *** the first acid leaching,the Wloss is 20.94%when the waste rare earth fluorescent powders are acid leached in H?concentration 3 mol L-1and S/L ratio 1:3 for 4 h due to red powders *** better results of the alkali fusion can be got at 800℃ for 2 h when the NaOH is *** blue powders and the green powders can be dissolved into NaAlO2and oxides such as rare earth oxide(REO).The REO can be dissolved in H?concentration 5 mol L-1,S/L1:10 for 3 h in the second acid *** leaching rates of the Y,Eu,Ce,and Tb are 99.06%,97.38%,98.22%,and 98.15%,*** leaching rate of the total rare earth is 98.60%.