Bioleaching of Nickel and Cobalt from Lateritic Chromite Overburden Using the Culture Filtrate of Aspergillus niger

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• 作者：Supratim Biswas (1)
  Rajib Dey (1)
  Siddhartha Mukherjee (1)
  Pataki C. Banerjee (2)
  
• 关键词：Aspergillus niger ; Bioleaching ; Chromite overburden ; Culture filtrate ; Mechanism of leaching ; Oxalic acid leaching
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：170
• 期：7
• 页码：1547-1559
• 全文大小：450KB
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• 作者单位：Supratim Biswas (1)
  Rajib Dey (1)
  Siddhartha Mukherjee (1)
  Pataki C. Banerjee (2)
  
  1. Department of Metallurgical and Material Engineering, Jadavpur University, Kolkata, 700032, India
  2. School of Material Science and Nanotechnology, Jadavpur University, Kolkata, 700032, India
  

文摘

Extraction of metals (Ni, Co) from chromite overburden of Sukinda mines of Orissa, India, with the culture filtrate of Aspergillus niger was studied. Results showed that the amounts of metals leached varied directly with reaction temperature and period of fermentation. The culture filtrate was analyzed for citric and oxalic acids, and contained only oxalic acid—the concentration of which increased with time. Although this acid played the major role in leaching of metals, other unidentified metabolites present in the culture filtrate influenced the dissolution of the metals significantly. Maximum recovery of metals from raw and roasted ore samples was achieved at 80?°C with the 21-day culture filtrate containing the highest amount of oxalic acid. Under identical experimental conditions, much higher amounts of the metals were leached from roasted ore. Microstructures of the ore particles were studied by scanning electron microscopy and transmission electron microscopy; the bonding behaviors of metal compounds were identified by Fourier transform infrared spectroscopy which showed that the metals were leached after chelation with oxalic acid.