Journal article
Bioleaching of spent hydro-processing catalyst using acidophilic bacteria and its kinetics aspect
Journal of Hazardous Materials, Vol.152(3), pp.1082-1091
2008
Abstract
Bioleaching of metals from hazardous spent hydro-processing catalysts was attempted in the second stage after growing the bacteria with sulfur in the first stage. The first stage involved transformation of elemental sulfur particles to sulfuric acid through an oxidation process by acidophilic bacteria. In the second stage, the acidic medium was utilized for the leaching process. Nickel, vanadium and molybdenum contained within spent catalyst were leached from the solid materials to liquid medium by the action of sulfuric acid that was produced by acidophilic leaching bacteria. Experiments were conducted varying the reaction time, amount of spent catalysts, amount of elemental sulfur and temperature. At 50 g/L spent catalyst concentration and 20 g/L elemental sulfur, 88.3% Ni, 46.3% Mo, and 94.8% V were recovered after 7 days. Chemical leaching with commercial sulfuric acid of the similar amount that produced by bacteria was compared. Thermodynamic parameters were calculated and the nature of reaction was found to be exothermic. Leaching kinetics of the metals was represented by different reaction kinetic equations, however, only diffusion controlled model showed the best correlation here. During the whole process Mo showed low dissolution because of substantiate precipitation with leach residues as MoO3. Bioleach residues were characterized by EDX and XRD.
Details
- Title
- Bioleaching of spent hydro-processing catalyst using acidophilic bacteria and its kinetics aspect
- Authors/Creators
- D. Mishra (Author/Creator)D.J. Kim (Author/Creator)D.E. Ralph (Author/Creator)J.G. Ahn (Author/Creator)Y.H. Rhee (Author/Creator)
- Publication Details
- Journal of Hazardous Materials, Vol.152(3), pp.1082-1091
- Publisher
- Elsevier BV
- Identifiers
- 991005544886607891
- Murdoch Affiliation
- Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
- 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
- Engineering, Environmental
- Environmental Sciences
- ESI research areas
- Engineering