<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Metal leaching from spent petroleum catalyst by acidophilic bacteria in presence of Pyrite"^^ . "This paper describes studies on the recovery of metals from spent hydro-processing catalyst using mixed acidophilic culture in presence of pyrite. This culture was initially grown in the 9K- medium (absence of 9 g/L Fe(II)) where ferrous sulphate (FeSO4) was replaced by pyrite, and then applied in this bioleaching study. Bacterial action on pyrite catalysed the formation of ferric ion (Fe+3), proton (H+) and sulphate ions (SO4-2) in the solution which leached metals (Ni, Mo and V) from the spent catalyst. Experiments were conducted by varying the reaction time, amount of spent catalyst and pyrite, and temperature. After 7 days with 30 g/L of spent catalyst and 50 g/L of pyrite, the leaching of Ni, V and Mo into the solution was 85, 92 and 26%, respectively. With increasing spent catalyst loading, the extent of metal dissolution was decreased, probably due to the precipitation of Fe+3 as a residue. Under all conditions tested, Mo showed recovery due to its precipitation with leach residues as MoO3 observed by applying EDAX and XRD techniques to the leach residues."^^ . "2008" . "49" . "10" . . "The Japan Institute of Metals"^^ . . . "Materials Transactions"^^ . . . "13459678" . . . . . . . . . . . . . . . . . "D.E."^^ . "Ralph"^^ . "D.E. Ralph"^^ . . "D."^^ . "Mishra"^^ . "D. Mishra"^^ . . "K.H."^^ . "Park"^^ . "K.H. Park"^^ . . "D-J"^^ . "Kim"^^ . "D-J Kim"^^ . . "J.G."^^ . "Ahn"^^ . "J.G. Ahn"^^ . . . . . "HTML Summary of #8329 \n\nMetal leaching from spent petroleum catalyst by acidophilic bacteria in presence of Pyrite\n\n" . "text/html" . . . . . . . . . . . . . . . . . . "D.E."^^ . "Ralph"^^ . "D.E. Ralph"^^ . ""^^ . . "D."^^ . "Mishra"^^ . "D. Mishra"^^ . ""^^ . . "K.H."^^ . "Park"^^ . "K.H. Park"^^ . ""^^ . . "D-J"^^ . "Kim"^^ . "D-J Kim"^^ . ""^^ . . "J.G."^^ . "Ahn"^^ . "J.G. Ahn"^^ . ""^^ .