文献类型：期刊文献

英文题名：Recovery of rare earth elements from spent fluid catalytic cracking catalysts using leaching and solvent extraction techniques

作者：Zhao, Zhexuan[1];Qiu, Zhaofu[1];Yang, Ji[1];Lu, Shuguang[1];Cao, Limei[1];Zhang, Wei[1];Xu, Yongye[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2017

卷号：167

起止页码：183

外文期刊名：HYDROMETALLURGY

收录：;EI(收录号：20165003127326);WOS:【SCI-EXPANDED(收录号:WOS:000392791100023)】；

语种：英文

外文关键词：Spent fluid catalytic cracking catalyst; Rare earth; Leaching; Extraction

摘要：This paper investigates the recovery of rare earth elements (REEs, mainly lanthanum and cerium) from spent fluid catalytic cracking (FCC) catalysts via the hydrometallurgical processes of leaching and liquid-to-liquid extraction. The maximum leaching efficiency (99.3% for REEs) was achieved under the following conditions: 2 mol/L HCI, a solid-to-liquid (S/L) ratio of 1:10, leaching at 60 degrees C for 2 h, and 2 h of roasting at 750 degrees C prior to leaching. Because the main impurity element in the leachate was aluminum, the extractions of REEs and aluminum using di-2-ethylhexyl phosphoric acid (D2EHPA) and 2-ethylhexylphosphonic mono-2-ethylhexyl ester (HEHEHP) under different conditions were compared. The results indicated that D2EHPA and HEHEHP exhibited large extraction differences for REEs but small extraction capacity differences for aluminum. Based on the analysis of the experiments, the optimum extraction conditions for REEs were determined to be 0.5 mol/L D2EHPA, equilibrium pH = 2.5, ambient temperature and then stripping with 2 mol/L HCI. The overall REEs recovery efficiency was 62.88%. (C) 2016 Elsevier B.V. All rights reserved.