Recovery of Magnetic Ni Particles from Spent Catalyst Leachate by Direct Cementation

Farhad Moosakazemi, Ali Entezari-Zarandi, Sina Ghassa and Faïçal Larachi ()
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Farhad Moosakazemi: Department of Chemical Engineering, Université Laval, 1065 Avenue de la Médecine, Québec, QC G1V 0A6, Canada
Ali Entezari-Zarandi: Geometallurgical Center, Agregat RN, Rouyn-Noranda, QC J9Y 0G2, Canada
Sina Ghassa: School of Mining, College of Engineering, University of Tehran, Tehran 1439957131, Iran
Faïçal Larachi: Department of Chemical Engineering, Université Laval, 1065 Avenue de la Médecine, Québec, QC G1V 0A6, Canada

Sustainability, 2024, vol. 16, issue 19, 1-14

Abstract: An alternative method based on cementation for the recovery of nickel from spent Ni/Al 2 O 3 reforming catalyst pregnant leach solution (PLS) was proposed to overcome the limitations of traditional two-step extraction and precipitation processes. Thermodynamic analysis was used to evaluate the potential interference of key reactions, such as nickel and sacrificial metal leaching, with the selective cementation of nickel from the PLS. Key variables in the cementation process were optimized using response surface methodology (RSM) combined with Box–Behnken design (BBD). Under optimal conditions—pH 2.2 ± 0.1, processing time of 15 min, and Al/Ni molar ratio of 2.65—a maximum nickel recovery of 73.2% was achieved. Extensive characterization confirmed the high quality of the cemented nickel product: (i) ICP-OES indicated nickel purity of 99.47%, (ii) XRD patterns verified the presence of pure face-centered cubic nickel, (iii) SEM-EDS and vibrating sample magnetometry confirmed the high purity of the metallic nickel particles.

Keywords: cementation; Ni recovery; spent catalyst; magnetic particles (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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