TY - JOUR
T1 - Leaching of chalcopyrite with ferric ion. Part IV
T2 - The role of redox potential in the presence of mesophilic and thermophilic bacteria
AU - Córdoba, E. M.
AU - Muñoz, J. A.
AU - Blázquez, M. L.
AU - González, F.
AU - Ballester, A.
PY - 2008/8
Y1 - 2008/8
N2 - This paper reports a study on the effect of redox potential in chalcopyrite bioleaching in the presence of iron- and sulphur-oxidizing bacteria. Bioleaching tests were carried out in stirred Erlenmeyer flasks at 180 rpm, with 0.5 g of chalcopyrite mineral, 99 ml of a sulphate solution of Fe3+/Fe2+ (with the redox potential ranging between 300 and 600 mV Ag/AgCl) at pH 1.8 and 1 ml of a mesophilic (35 °C) or thermophilic (68 °C) culture. The overoxidation of the leaching solution, due to the activity of iron-oxidizing microorganisms (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans and Sulfolobus BC), favoured the precipitation of jarosite on chalcopyrite surfaces followed by passivation. Iron- and sulphur-oxidizing microorganisms, such as A. ferrooxidans and Sulfolobus BC adapted for 4 months to elemental sulphur as the sole energy source, recovered their iron-oxidizing ability after being in contact with Fe2+.
AB - This paper reports a study on the effect of redox potential in chalcopyrite bioleaching in the presence of iron- and sulphur-oxidizing bacteria. Bioleaching tests were carried out in stirred Erlenmeyer flasks at 180 rpm, with 0.5 g of chalcopyrite mineral, 99 ml of a sulphate solution of Fe3+/Fe2+ (with the redox potential ranging between 300 and 600 mV Ag/AgCl) at pH 1.8 and 1 ml of a mesophilic (35 °C) or thermophilic (68 °C) culture. The overoxidation of the leaching solution, due to the activity of iron-oxidizing microorganisms (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans and Sulfolobus BC), favoured the precipitation of jarosite on chalcopyrite surfaces followed by passivation. Iron- and sulphur-oxidizing microorganisms, such as A. ferrooxidans and Sulfolobus BC adapted for 4 months to elemental sulphur as the sole energy source, recovered their iron-oxidizing ability after being in contact with Fe2+.
UR - http://www.scopus.com/inward/record.url?scp=45049088797&partnerID=8YFLogxK
U2 - 10.1016/j.hydromet.2007.11.005
DO - 10.1016/j.hydromet.2007.11.005
M3 - Artículo en revista científica indexada
AN - SCOPUS:45049088797
SN - 0304-386X
VL - 93
SP - 106
EP - 115
JO - Hydrometallurgy
JF - Hydrometallurgy
IS - 3-4
ER -