TY - JOUR
T1 - Leaching of Mn, Co, and Ni from manganese nodules using an anaerobic bioleaching method
AU - Lee, Eun Young
AU - Noh, Seung Rim
AU - Cho, Kyung Suk
AU - Ryu, Hee Wook
N1 - Funding Information:
The funding for this researchw as provided by the National Re-searchL aboratoryP rogram of the Korean Ministry of Science and Technology,a nd the Brain Korea 21 Project of the Korean Ministry of Education.
PY - 2001
Y1 - 2001
N2 - An anaerobic bioleaching of a manganese nodule by anaerobic Mn-reducing bacteria was evaluated for the leaching of metals, Mn, Co, and Ni. Insoluble Mn4+ in the nodule could be reduced to soluble Mn2+ by dissimilatory Mn-reducing bacteria that use a carbon source and Mn4+ as an electron donor and acceptor, respectively. As a result of the Mn reduction, Co and Ni could be leached from the loosed Mn matrix. Leaching experiments were carried out to optimize various process parameters, such as inoculation, pH, temperature, mineral salts, and particle size of the nodule used. The leaching efficiencies of Mn, Co, and Ni increased from 18, 7, and 10% to 77, 70, and 75%, respectively by the inoculation of the Mn-reducing enrichment culture broth. Metals could be efficiently recovered from the nodule in the ranges of pH from 5.0 to 6.5 and temperature from 30 to 45°C by anaerobic bioleaching. External addition of mineral salts was not necessary for Mn, Co, and Ni leaching from the nodule. The optimum ratio of nodule to glucose was 0.1 (w/w). To obtain a leaching efficiency above 70%, the particle size of the nodules must be less than 0.6 mm.
AB - An anaerobic bioleaching of a manganese nodule by anaerobic Mn-reducing bacteria was evaluated for the leaching of metals, Mn, Co, and Ni. Insoluble Mn4+ in the nodule could be reduced to soluble Mn2+ by dissimilatory Mn-reducing bacteria that use a carbon source and Mn4+ as an electron donor and acceptor, respectively. As a result of the Mn reduction, Co and Ni could be leached from the loosed Mn matrix. Leaching experiments were carried out to optimize various process parameters, such as inoculation, pH, temperature, mineral salts, and particle size of the nodule used. The leaching efficiencies of Mn, Co, and Ni increased from 18, 7, and 10% to 77, 70, and 75%, respectively by the inoculation of the Mn-reducing enrichment culture broth. Metals could be efficiently recovered from the nodule in the ranges of pH from 5.0 to 6.5 and temperature from 30 to 45°C by anaerobic bioleaching. External addition of mineral salts was not necessary for Mn, Co, and Ni leaching from the nodule. The optimum ratio of nodule to glucose was 0.1 (w/w). To obtain a leaching efficiency above 70%, the particle size of the nodules must be less than 0.6 mm.
KW - Anaerobic bioleaching
KW - Cobalt
KW - Manganese
KW - Manganese nodules
KW - Metal resource
KW - Mn-reducing bacteria
KW - Nickel
UR - http://www.scopus.com/inward/record.url?scp=0035172659&partnerID=8YFLogxK
U2 - 10.1016/S1389-1723(01)80239-5
DO - 10.1016/S1389-1723(01)80239-5
M3 - Article
C2 - 16233110
AN - SCOPUS:0035172659
SN - 1389-1723
VL - 92
SP - 354
EP - 359
JO - Journal of Bioscience and Bioengineering
JF - Journal of Bioscience and Bioengineering
IS - 4
ER -