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Received October 24, 2017
Accepted February 5, 2018
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Production of high purity rare earth mixture from iron-rich spent fluid catalytic cracking (FCC) catalyst using acid leaching and two-step solvent extraction process
Le-Phuc Nguyen1†
Yen Thi Hai Pham1
Phuong Thuy Ngo1
Tri Van Tran1
Loc Vinh Tran1 2
Nam Thi Hoai Le2
Luong Huu Nguyen1
Tung Thanh Dang1
Duc Anh Nguyen1
Marco Wenzel3
David Hartmann3
Karsten Gloe3
Jan J. Weigand3†
Klaus Kretschmer4
1Catalysis Research Department, Vietnam Petroleum Institute, Saigon Hi-Tech Park, District 9, Ho Chi Minh City, Vietnam 2Vietnam Academy of Science and Technology, Vietnam 3Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden, Germany 4Delta Engineering & Chemistry GmbH, 14476 Groβglienicke, Germany
Korean Journal of Chemical Engineering, May 2018, 35(5), 1195-1202(8), 10.1007/s11814-018-0022-z
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Abstract
Acid leaching and a two-step solvent extraction procedure were developed to produce high purity mixture of La and Ce from iron-rich spent FCC catalyst discharged from Dzung Quat refinery (Vietnam). Acid leaching of the spent catalyst with 2M HNO3 and a solid-to-liquid ratio of 1/3 at 80 °C in 1 h dissolved almost 90% of La while 12% of Al and 25% of Fe were transferred to the leachate. The extraction of RE metals and main impurities such as Al and Fe by a mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and tributyl phosphate (TBP) was investigated. Experiments showed that it was necessary to remove Fe before extracting RE and the optimum extraction conditions for a high recovery of RE while 0% of Al extraction were pH≤1, contact time=10min, and D2EHPA/TBP volume ratio= 4 : 1. At these conditions, the extraction yields of La(III) and Ce(III) were 72% and 89%, respectively. A two-step solvent extraction was developed to achieve a high purity of RE mixture, which included (1) the removal of impurity Fe by 25% (v/v) diisooctyl phosphinic acid (DiOPA) in n-octane for 140 min, (2) the extraction of rare earths by a mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and tributyl phosphate (TBP) in n-octane for 10 min without the need for adjusting the pH of the leaching solution.
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