LI Guangyue, DIAO Ningning, WANG Yongdong, et al. Bioleaching of copper from tailings by fermentation broths of Aspergillus niger in pellet form[J]. CIESC Journal, 2015, (2): 717-722.
LI Guangyue, DIAO Ningning, WANG Yongdong, et al. Bioleaching of copper from tailings by fermentation broths of Aspergillus niger in pellet form[J]. CIESC Journal, 2015, (2): 717-722.DOI: 10.11949/j.issn.0438-1157.20141047.
Owing to the substantial amounts of metals embodied in tailings
they are potential viable sources of metals. This work aims at developing a technique to microbially recover copper present in tailings. Based on orthogonal design
the effects of different variables
such as temperature
fermentation time
inoculum size and medium components
on pellet morphology of A. niger were investigated in shake flasks. Leaching of copper from its tailings was conducted using fermentation broths of Aspergillus niger with different pellet morphology. Copper extraction gradually increased with reduction in pellet diameter of A. niger. A large amount of compact smooth pellets with a diameter of 0.96 mm were obtained under the optimum fermentation conditions of 30℃
0.8% inoculum size(OD600=0.1)
30% potato-sucrose contents
65 h fermentation time. After 3 days of leaching
copper extraction reached 83.25% with the fermentation broths aforementioned at 30℃