Bioleaching of Phosphorus from Low Grade Ores and Concentrates with Acidophilic Iron- and Sulphur-Oxidizing Bacteria

Abstract:

Bioleaching experiments of phosphorus from low grade fluorapatite ore containing 8.2% P₂O₅ and from fluorapatite concentrate containing 29.8% P₂O₅ were carried out in shake flasks. Elemental sulphur was supplemented as an energy source for acid generation. Mixed and pure acidophilic bacterial cultures consisting of iron-and/or sulphur-oxidizing bacteria Acidithiobacillus ferrooxidans, A. thiooxidans and Leptospirillum ferrooxidans were used in the experiments. These acidophiles are commonly used in bioleaching of sulphide minerals, but their application on phosphorus bioleaching has been limited. Phosphorus leaching was shown to be a pH-dependant phenomenon. Phosphorus leaching yields of up to 97% and 28% were obtained in 3 weeks for low grade fluorapatite ore and concentrate, respectively. These results indicate a potential for applying bioleaching for phosphorus extraction from low grade materials.

• Periodical: Advanced Materials Research (Volume 825)
• Pages: 266-269
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.825.266
• Online since: October 2013
• Authors: Tuija H. Sarlin, Outi K. Priha, Mona E. Arnold, Päivi Kinnunen
• Keywords: Acidophilic Bacteria, Bioleaching, Phosphorus

References

[1] J. Elser, S. White: Peak Phosphorus. In: Policy, F. (Ed. ) (2010) <http: /www. foreignpolicy. com/articles/2010/2004/2020/peak_phosphorus>.

[2] M. Gharabaghi, M. Irannajad, M. Noaparast: A review of the beneficiation of calcareous phosphate ores using organic acid leaching. Hydrometall 103 (2010) 96–107.

DOI: 10.1016/j.hydromet.2010.03.002

[3] D.E. Rawlings: Heavy metal mining using microbes. Annu Rev Microbiol 56 (2002) 65–91.

DOI: 10.1146/annurev.micro.56.012302.161052

[4] T.M. Bhatti, W. Yawar: Bacterial solubilization of phosphorus from phosphate rock containing sulphur-mud. Hydrometall 103 (2010) 54–59.

DOI: 10.1016/j.hydromet.2010.02.019

[5] R. Chi, C. Xiao, H. Gao:. Bioleaching of phosphorus from rock phosphate containing pyrites by Acidithiobacillus ferrooxidans. Min Eng 19 (2006) 979–981.

DOI: 10.1016/j.mineng.2005.10.003

[6] J. Zimmermann, W. Dott: Sequenced bioleaching and bioaccumulation of phosphorus from sludge combustion - a new way of resource reclaiming. Adv Mater Res 71–73 (2009) 625–628.

DOI: 10.4028/www.scientific.net/amr.71-73.625

[7] J. Wang, S. Shen, J. Kang, H. Li, Z. Guo: Effect of ore solid concentration on the bioleaching of phosphorus from high-phosphorus iron ores using indigenous sulfur-oxidizing bacteria from municipal wastewater. Proc Biochem 45 (2010) 1624–1631.

DOI: 10.1016/j.procbio.2010.06.013

[8] C. Xiao, R. Chi, W. Li, Y. Zheng: Biosolubilisation of phosphorus from rock phosphate by moderately thermophilic and mesophilic bacteria. Min Eng 24 (2011) 956–958.

DOI: 10.1016/j.mineng.2011.01.008

[9] S.J. van Kauwenbergh: World phosphate rock reserves and resources. International Fertilizer Development Center (IFDC). Technical Bulletin IFDC-T-75 (2010) 48 p.