Recovery of Rare Earths from Spent FCC Catalysts by Solvent Extraction Using Saponified 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (EHEHPA)
A process to recover Rare Earth (RE) metals from spent fluid catalytic cracking (FCC) catalysts by solvent extraction was studied, using saponified 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (EHEHPA or P507).The recovery process involved three important steps: 1) leaching REs (mainly lanthanum and cerium);2) solvent extraction by applying saponified P507-kerosene system;3) stripping.Experiments to assure the optimal operating conditions were conducted.The results indicated that rare earth can be regained effectively from saponified P507-kerosene-HCI system.At room temperature of 25℃, a catalysts capacity of 10 g with 110 mL 1 mol/L HCI can achieve a leaching efficiency higher than 85%.For extraction, initial pH value of 3.17,O/A ratio of 2∶1 with extractants” saponification rate of 20% can sustain 100% efficiency.In stripping section, 1 mol/L HCI with O/A ratio of 1∶1 lead to a back-extraction efficiency of 96%.In this procedure, the disposal of the abundant spent FCC catalysts could be settled as well as the recovery of rare earths from spent FCC catalysts,leading to a relieve of the severe environmental issues.
recovery rare earths fluid catalytic cracking catalysts saponified P507-kerosene system
YE Sishi JING Yu WANG Yundong FEI Weiyang
The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
国内会议
南宁
英文
45-53
2016-09-06（万方平台首次上网日期，不代表论文的发表时间）