Characterization of different types of petroleum refinery spent catalyst followed by microbial mediated leaching of metal values

The present study aims for characterization and classification of five different spent petroleum refinery catalysts followed by metal recovery via bioleaching. nomenclature given to the catalyst (SC) is SC1, SC2, SC3, SC4 SC5 collected from an Indian refinery. All were crushed ground prior their X-Ray Fluorescence chemical composition Diffraction Scanning Electron Microscopy-Energy Dispersive Spectroscopy mineralogy. Further, all classified based upon Metal was carried out bioleaching a mixed microbial consortium iron Sulphur oxidizing microorganisms. Most showed very significant with respect Ni, Cu, Cr, Mo, Zn, Sr Ti. provides possible route further testing scaling up.