The Effect of pH on Bioleaching of Deerni Pyrite Roasting Residues as Magnetic Materials

Abstract:

The experiment focused on the Deerni pyrite roasting residues mainly made of magnetic materials such as hematite and magnetite in Qinghai Deerni Copper Deposit. The method of bioleaching sulfuric acid residue by bacteria was proposed for roasting residues desulfurization and valuable metal extraction. First of all, the study systematically performed multi-elements analysis, which provided scientific and technique basis for extraction of valuable metals. Subsequently, the effect of the pH value on the bacterial growth was investigated. The data revealed that pH at 1.2 was the optimum culture condition for the bacteria. The concentration of the bacteria at the best culture condition reached 8.5×10⁷ cells/mL. Finally, the bioleaching experiments were performed to explore the ability of the NB bacteria to oxidize the Deerni pyrite roasting residues. The study demonstrated that the microorganism was able to effectively extract valuable metals such as copper and zinc. The total Fe and sulfur contents of the bioleaching residues account for 68.38% and 0.39%, respectively. The desulfurization effects are evident and bioleaching residues meet the requirements as magnetic materials in steel making industry.

• Periodical: Key Engineering Materials (Volume 730)
• Pages: 226-230
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.730.226
• Online since: February 2017
• Authors: Xing Lan Cui, Hao En Zuo, Jian Kang Wen*
• Keywords: Bacteria, Bioleaching, Magnetic Materials, pH, Roasting Residues

References

[1] Y. J. Zheng, Z. C. Liu, Preparation of monodispersed micaceous iron oxide pigment from pyrite cinders, Powd. Tech. 207 (2011) 335-342.

DOI: 10.1016/j.powtec.2010.11.015

[2] İ. Alp, H. Deveci, E. Y. Yazıcı, Potential use of pyrite cinders as raw material in cement production: Results of industrial scale trial operations, J. Hazard. Mater. 16 (2009) 144-149.

DOI: 10.1016/j.jhazmat.2008.10.129

[3] S. Panda, A. Akcil, N. Pradhan, Current scenario of chalcopyrite bioleaching: A review on the recent advances to its heap-leach technology, Biores. Tech. 196 (2015) 694-706.

DOI: 10.1016/j.biortech.2015.08.064

[4] T. Huang, D. W. Li, Presentation on mechanisms and applications of chalcopyrite and pyrite bioleaching in biohydrometallurgy-a presentation, Biotech. Rep. 4 (2014) 107-119.

DOI: 10.1016/j.btre.2014.09.003

[5] H. B. Zhao, J. Wang, W. Q. Qin, Surface species of chalcopyrite during bioleaching by moderately thermophilic bacteria, Trans. Nonferr. Met. Soc. China, 25 (2015) 2725-2733.

DOI: 10.1016/s1003-6326(15)63897-3

[6] Z. H. Guo, L. Zhang, Y. Cheng, Effects of pH, pulp density and particle size on solubilization of metals from a Pb/Zn smelting slag using indigenous moderate thermophilic bacteria, Hydrometall. 104 (2010) 25-31.

DOI: 10.1016/j.hydromet.2010.04.006

[7] S. Ghassa, Z. Boruomand, H. Abdollahi, Bioleaching of high grade Zn–Pb bearing ore by mixed moderate thermophilic microorganisms, Separat. Purificat. Tech. 136 (2014) 241-249.

DOI: 10.1016/j.seppur.2014.08.029