Selective precipitation of metals from synthetic spent refinery catalyst leach liquor with biogenic H2S produced in a lactate-fed anaerobic baffled reactor

A. Cibati; K.Y. Cheng; C. Morris; M.P. Ginige; E. Sahinkaya; F. Pagnanelli; A.H. Kaksonen

doi:10.1016/j.hydromet.2013.01.022

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Selective precipitation of metals from synthetic spent refinery catalyst leach liquor with biogenic H2S produced in a lactate-fed anaerobic baffled reactor

Journal article

Peer reviewed

Selective precipitation of metals from synthetic spent refinery catalyst leach liquor with biogenic H2S produced in a lactate-fed anaerobic baffled reactor

A. Cibati, K.Y. Cheng, C. Morris, M.P. Ginige, E. Sahinkaya, F. Pagnanelli and A.H. Kaksonen

Hydrometallurgy, Vol.139, pp.154-161

2013

DOI: https://doi.org/10.1016/j.hydromet.2013.01.022

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Abstract

This work evaluated the feasibility of using biogenic H2S and NaOH to selectively precipitate molybdenum (Mo), nickel (Ni), cobalt (Co) and vanadium (V) from synthetic spent refinery catalyst leach liquor. A lactate-fed sulfate-reducing anaerobic baffled reactor (ABR) was operated at room temperature to generate the required H2S. The average sulfate reduction rate in the ABR was 130 mg L− 1 d− 1 and the average dissolved sulfide concentration was 190 mg L− 1. Biogenic H2S facilitated the selective precipitation of Mo at pH 2 with recoveries of 36–72%. Vanadium precipitation of 64–70% was achieved with NaOH at pH 6. The purity indices of Mo and V precipitates were 0.97 and 0.90 at pH 2 and pH 6, respectively. Percent Ni and Co precipitations were only up to 23 and 16%, respectively at pH 3.5, and the purity indices of these metals were low due to their simultaneous precipitation. After the optimization of the Ni and Co precipitations, the mixed Ni–Co sulfide solids could be sold to smelters or hydrometallurgical processing to recover the metals. Moreover, using biogenic H2S to selectively precipitate Mo at pH 2 as sulfide and NaOH to precipitate V at pH 6 as hydroxide/oxide could be a viable option for recovering these metals from spent catalysts leachate.

Details

Title: Selective precipitation of metals from synthetic spent refinery catalyst leach liquor with biogenic H2S produced in a lactate-fed anaerobic baffled reactor
Authors/Creators: A. Cibati (Author/Creator) - CSIRO Land and Water
K.Y. Cheng (Author/Creator) - CSIRO Land and Water
C. Morris (Author/Creator) - CSIRO Land and Water
M.P. Ginige (Author/Creator) - CSIRO Land and Water
E. Sahinkaya (Author/Creator) - Istanbul Medeniyet University
F. Pagnanelli (Author/Creator) - Sapienza University of Rome
A.H. Kaksonen (Author/Creator) - CSIRO Land and Water
Publication Details: Hydrometallurgy, Vol.139, pp.154-161
Publisher: Elsevier BV
Identifiers: 991005540872907891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 7 Engineering & Materials Science; 7.229 Mineral & Metal Processing; 7.229.774 Bioleaching
Web Of Science research areas: Metallurgy & Metallurgical Engineering
ESI research areas: Materials Science