Production of high purity rare earth mixture from iron-rich spent fluid catalytic cracking (FCC) catalyst using acid leaching and two-step ... View Full Text


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Article Info

DATE

2018-05

AUTHORS

Le-Phuc Nguyen, Yen Thi Hai Pham, Phuong Thuy Ngo, Tri Van Tran, Loc Vinh Tran, Nam Thi Hoai Le, Luong Huu Nguyen, Tung Thanh Dang, Duc Anh Nguyen, Marco Wenzel, David Hartmann, Karsten Gloe, Jan J. Weigand, Klaus Kretschmer

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. More... »

PAGES

1195-1202

References to SciGraph publications

  • 2013-12. Selective Leaching Process for Neodymium Recovery from Scrap Nd-Fe-B Magnet in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2017-01. Hydrometallurgical processing of Nd–Fe–B magnets for Nd purification in JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
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    http://scigraph.springernature.com/pub.10.1007/s11814-018-0022-z

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    http://dx.doi.org/10.1007/s11814-018-0022-z

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