TY - JOUR
T1 - Sequential pretreatment of double refractory gold ore (DRGO)with a thermophilic iron oxidizing archeaon and fungal crude enzymes
AU - Konadu, Kojo T.
AU - Huddy, Robert J.
AU - Harrison, Susan T.L.
AU - Osseo-Asare, Kwadwo
AU - Sasaki, Keiko
N1 - Funding Information:
The authors are very grateful to Dr. Megan Becker and Ms. Gaynor Yorath at Department of Chemical Engineering, University of Cape Town for their help with the QEMSCAN analysis. This work was financially supported to KS by Japan Society for the Promotion of Science JSPS KAKENHI Grant numbers 18K19045 and 18J10835 , and Arai Science and Technology Foundation . KTK appreciates the Advanced Graduate Program in Global Strategy for Green Asia in Kyushu University and JSPS DC2 18J10835 for the scholarship.
Funding Information:
The authors are very grateful to Dr. Megan Becker and Ms. Gaynor Yorath at Department of Chemical Engineering, University of Cape Town for their help with the QEMSCAN analysis. This work was financially supported to KS by Japan Society for the Promotion of Science JSPS KAKENHI Grant numbers 18K19045 and 18J10835, and Arai Science and Technology Foundation. KTK appreciates the Advanced Graduate Program in Global Strategy for Green Asia in Kyushu University and JSPS DC2 18J10835 for the scholarship.
PY - 2019/7
Y1 - 2019/7
N2 - Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders.
AB - Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders.
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U2 - 10.1016/j.mineng.2019.04.043
DO - 10.1016/j.mineng.2019.04.043
M3 - Article
AN - SCOPUS:85065125039
SN - 0892-6875
VL - 138
SP - 86
EP - 94
JO - Minerals Engineering
JF - Minerals Engineering
ER -