Paper Titles
Bioleaching of a Rich-In-Carbonates Copper Ore at Alkaline pH
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Cobalt and Nickel Recoveries from Laterite Tailings by Organic and Inorganic Bioacids
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Bioleaching of a High Iron Content Kaolin by Aspergillus niger: The Effects of Organic Acids Biosynthesis
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Optimization of Kaolin Bioleaching by Aspergillus niger
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Application of Mesophilic Mixed Micro-Organisms for Recovery of Valuable Metals from Spent Refinery Catalysts
p.119
Biological Purification of Silicate Minerals
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Deferrization of Kaolinic Sand by Iron Oxidizing and Iron Reducing Bacteria
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Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation
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Monitoring of Hydrocarbon Gaseous Compounds formed During Bioleaching of Copper Sulphide Minerals with Mesophilic Microorganisms
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Application of Mesophilic Mixed Micro-Organisms for Recovery of Valuable Metals from Spent Refinery Catalysts

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Abstract:

Bioleaching of pre-treated spent refinery catalyst was performed using sulfur and iron oxidizing bacteria separately. Both the mixed cultures were grown at various concentration of either ferrous sulfate or elemental sulfur. Bioleaching process was conducted by varying the reaction time, effect of substrates and effect of catalyst amount. Under the most favourable transport conditions examined, (5g/L spent catalysts, 10g/L ferrous sulfate, reaction time 7 days) the mixed iron oxidizing bacteria were able to recover Ni, V, and Mo of 90, 80 and 54 % respectively. Higher catalyst and ferrous sulfate concentration showed decline result in recovery of Mo and V. Ni showed consistent results throughout the series of experiments (88 to 90% recovery). The mixed sulfur oxidizing bacteria were observed to be more effective than the iron oxidizing bacteria. The sulfur oxidizing cells were able to recover Ni, V and Mo of 88, 94 and 46 % respectively (spent catalysts 50g/L, elemental sulfur of 2% (w/v), reaction time 7 days). The oxidation of elemental sulfur to sulfate could play a vital role for extraction of the metals.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

119-125

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.119

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Online since:

July 2007

Authors:

Dong Jin Kim, D. Mishra, D.E. Ralph, Jong Gwan Ahn, Y.H. Rhee

Keywords:

Bioleaching, Iron Oxidizing Bacteria, Spent Catalyst, Sulphur-Oxidizing Bacteria

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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