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Co(II) and Ni(II) transport from model and real sulfate solutions by extraction with bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272).

Authors
  • Stefaniak, Jakub1
  • Karwacka, Sara2
  • Janiszewska, Małgorzata2
  • Dutta, Abhishek3
  • Rene, Eldon R4
  • Regel-Rosocka, Magdalena5
  • 1 Poznan University of Technology, Institute of Chemical Technology and Engineering, ul. Berdychowo 4, 60-965, Poznan, Poland; KU Leuven, Campus Groep T Leuven, Faculteit Industriële Ingenieurswetenschappen, Andreas Vesaliusstraat 13, B-3000, Leuven, Belgium. , (Belgium)
  • 2 Poznan University of Technology, Institute of Chemical Technology and Engineering, ul. Berdychowo 4, 60-965, Poznan, Poland. , (Poland)
  • 3 KU Leuven, Campus Groep T Leuven, Faculteit Industriële Ingenieurswetenschappen, Andreas Vesaliusstraat 13, B-3000, Leuven, Belgium. , (Belgium)
  • 4 IHE Delft Institute for Water Education, Department of Environmental Engineering and Water Technology, P. O. Box 3015, 2601 DA, Delft, the Netherlands. , (Netherlands)
  • 5 Poznan University of Technology, Institute of Chemical Technology and Engineering, ul. Berdychowo 4, 60-965, Poznan, Poland. Electronic address: [email protected] , (Poland)
Type
Published Article
Journal
Chemosphere
Publication Date
Sep 01, 2020
Volume
254
Pages
126869–126869
Identifiers
DOI: 10.1016/j.chemosphere.2020.126869
PMID: 32957283
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This paper presents the results of Co(II) and Ni(II) extraction from model and real solutions using bis(2,4,4-trimethylpentyl)phosphinic acid (i.e. Cyanex 272) that are in agreement with waste-to-resources approach, i.e. the recovery of valuable components from wastes. The results from this study shows that, extraction using Cyanex 272 is an efficient method to recover Co(II) selectively from sulfate electrolytes obtained from the leaching of steel scraps of aircraft engines. The highest selectivity value (∼160) of Co(II) extraction over Ni(II) was obtained at a pH of 4.8, the lowest selectivity value (∼30) was observed at a pH of 5.5, while above this value the selectivity only increased slightly with increasing pH. A pH of 5.2 was selected as a compromise between Co(II) selectivity and Ni(II) amount in the organic phase. The essence of the investigation is to propose important parameters to extract Co(II) from real leach solutions, and to further recover valuable Co(II) from the loaded organic phase by stripping with 1 M H2SO4, thus producing an electrolyte of Co(II) for electrowinning - a possible alternative route for resource recovery. Small volume of the stripping phase (w/o = 1:5) used in this study, lead to an enrichment of sulfate electrolyte in Co(II), resulting in ∼50 g/dm3 of Co(II) in the solution, which is a great advantage of the approach proposed. Such a solution is a valuable source for the electrowinning of metallic cobalt, which can be used for the production of steel alloys, Li-ion batteries or catalysts. Copyright © 2020 The Author(s). Published by Elsevier Ltd.. All rights reserved.

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