Comparison of chalcopyrite bioleaching after different microbial enrichment in shake flasks.
The bioleachings of chalcopyrite ore were compared after inoculating different cultures enriched from the original acid mine drainage sample. The results showed that the higher bioleaching performance was achieved for inoculation with the enrichment D (0.5 % S, 2 % iron and 1 % chalcopyrite) compared to other enrichment systems. The generated ferric precipitation during bioleaching had a key influence on the final copper extraction. After enrichment, higher ratio of iron-oxidizer and higher ratio of sulfur-oxidizer existed in enrichment B and C, respectively. These caused the different bioleaching behaviours from other systems. Maintaining a suitable equilibrium between iron- and sulfur-oxidizers is significant to decrease ferric precipitation or postpone its formation, finally prolong efficient bioleaching period and improve copper extraction.
Key Laboratory of Biohydrometallurgy of Ministry of Education, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China. xialex888@163.com
Lexian
L
Xia
Paulina
P
Uribe
Xinxing
X
Liu
Chu
C
Yu
Liyuan
L
Chai
Jianshe
J
Liu
Wenqin
W
Qiu
Guanzhou
G
Qiu
D001419:Bacteria / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D061249:Batch Cell Culture Techniques; D002681:China; D003300:Copper / Q000032:analysis / Q000378:metabolism*; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology*; D007218:Industrial Microbiology / Q000379:methods*; D008906:Mining; D010084:Oxidation-Reduction
C012819:chalcopyrite; D003300:Copper