Pre-beneficiation of Low Grade Diasporic Bauxite Ore by Reduction Roasting
Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32920
Pre-beneficiation of Low Grade Diasporic Bauxite Ore by Reduction Roasting

Authors: K. Yılmaz, B. Birol, M. N. Sarıdede, E. Yiğit


A bauxite ore can be utilized in Bayer Process, if the mass ratio of Al2O3 to SiO2 is greater than 10. Otherwise, its FexOy and SiO2 content should be removed. On the other hand, removal of TiO2 from the bauxite ore would be beneficial because of both lowering the red mud residue and obtaining a valuable raw material containing TiO2 mineral. In this study, the low grade diasporic bauxite ore of Yalvaç, Isparta, Turkey was roasted under reducing atmosphere and subjected to magnetic separation. According to the experimental results, 800°C for reduction temperature and 20000 Gauss of magnetic intensity were found to be the optimum parameters for removal of iron oxide and rutile from the nonmagnetic ore. On the other hand, 600°C and 5000 Gauss were determined to be the optimum parameters for removal of silica from the non-magnetic ore.

Keywords: Low grade diasporic bauxite, magnetic separation, reduction roasting, separation index.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3194


[1] A. Pehlivan, A. O. Aydin, and A. Alp, “Alumina Extraction From Low - Grade Diasporic Bauxite By Pyro - Hydro Metallurgical Process,” Sak. Univ. J. Sci., vol. 16, no. 2, pp. 92–98, 2012.
[2] L. Y. Sadler and C. Venkataraman, “A process for enhanced removal of iron from bauxite ores,” Int. J. Miner. Process., vol. 31, no. 3–4, pp. 233–246, 1991.
[3] C. Li, H. Sun, J. Bai, and L. Li, “Innovative methodology for comprehensive utilization of iron ore tailings. Part 1. The recovery of iron from iron ore tailings using magnetic separation after magnetizing roasting,” J. Hazard. Mater., vol. 174, pp. 71–77, 2010.
[4] J. Pesl and R. H. Eric, “High temperature carbothermic reduction of Fe2O3-TiO2-MxOy oxide mixtures,” in Minerals Engineering, 2002, vol. 15, no. 11, pp. 971–984.
[5] H. Yang, L. Jing, and B. Zhang, “Recovery of iron from vanadium tailings with coal-based direct reduction followed by magnetic separation,” J. Hazard. Mater., vol. 185, no. 2–3, pp. 1405–1411, 2011.
[6] Z. Cui, Q. Liu, and T. Etsell, “Magnetic properties of ilmenite, hematite and oilsand minerals after roasting,” Miner. Eng., vol. 15, no. 12, pp. 1121–1129, Dec. 2002.
[7] R. Kumar and J. Srivastava, and Premchand “Utilization of iron values of red mud for metallurgical applications,” in Proc. Environmental and Waste Management in Nonferrous Metallurgical Industries, Jamshedpur, pp. 108–119, 1998.
[8] G. G. O. O. Uwadiale, “Magnetizing Reduction of Iron Ores,” Miner. Process. Extr. Metall. Rev., vol. 11, no. October 2013, pp. 1–19, 1992.
[9] M. I. Nasr and M. a. Youssef, “Optimization of Magnetizing Reduction and Magnetic Separation of Iron Ores by Experimental Design.,” ISIJ Int., vol. 36, no. 1 996, pp. 631–639, 1996.