Abstract
Clay impurities associated with bauxite negatively affect the Bayer process for alumina production. These impurities should be removed as far as possible by a beneficiation technique before the ore is used as feed for the Bayer process. In this current investigation, bauxite washing was conducted in the laboratory. Bauxite washing is a physical process that causes the disintegration and deagglomeration of the clay matrix, and bauxite is liberated from the clay (mainly rich in silica). Subsequently, separation occurs with the assistance of wet screening at a predetermined cut size. Three techniques were investigated in the laboratory: drum washing, water-jet washing, and ultrasonic washing. Various operating parameters were investigated for drum washing and water-jet washing, including materials retention time, drum rotation speed, solid concentration, water-jet spray duration, pressure, and height. We concluded that the retention time of bauxite inside the drum at a solid concentration of 55wt% and a drum rotation speed of 31 r/min is the dominant parameter for the removal of clay from the bauxite surface.
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References
J. Harder, Course of expansion, AT Miner. Process. Engl. Ed., 2010, No. 5, p. 44.
K.K. Chatterjee, Uses of Metals and Metallic Minerals, New Age International Pvt. Ltd. Publishers, New Delhi, 2007, p. 25.
G. Bárdossy and G.J.J. Aleva, Lateritic Bauxites. Developments in Economic Geology, Vol. 27, Elsevier Science, Amsterdam, 1990.
P. Smith, The processing of high silica bauxites: review of existing and potential processes, Hydrometallurgy, 98(2009), No. 1–2, p. 162.
F. Mendes, F. Feitosa, D. Sugden, H. Delboni, and O. da Silva A, Design, simulation and operation of the Miltonia beneficiation circuit, [in] Proceedings of the 8th International Alumina Quality Workshop, 2008, p. 365.
P.G. Bhukte, S.P. Puttewar, and R.S. Mishra, Beneficiation of low grade bauxite/laterite: a comparative study, [in] Proceedings of International Seminar on Mineral Processing Technology (MPT 2007), Mumbai, 2007, p. 176.
S. Buntenbach, Bauxite beneficiation, Aufbereit. Tech., 48(2007), No. 3, p. 4.
S. Buntenbach, F. Donhauser, G. Basu, and S. Chatterjee, Mineral processing technology in the bauxite and alumina industry, [in] Proceedings of International Seminar on Mineral Processing Technology (MPT 2007), Mumbai, 2007, p. 100.
P. Grotjohann and H. Müller, Innovative and resource-preserving washing processes for primary and secondary raw materials, [in] XXV International Minerals Processing Congress (IMPC), Brisbane, 2010, p. 3441.
S.G. Ozkan, Effects of simultaneous ultrasonic treatment on flotation of hard coal slimes, Fuel, 93(2012), p. 576.
S.G. Ozkan and H.Z. Kuyumcu, Investigation of mechanism of ultrasound on coal flotation, Int. J. Miner. Process., 81(2006), No. 3, p. 201.
S. Na, Y. Park, A. Hwang, J. Ha, Y. Kim, and J. Khim, Effect of ultrasound on surfactant-aided soil washing, Jpn. J. Appl. Phys., 46(2007), p. 4775.
D. Feng, L. Lorenzen, C. Aldrich, and P.W. Mare, Ex situ diesel contaminated soil washing with mechanical methods, Miner. Eng., 14(2001), No. 9, p. 1093.
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Ahmad, I., Hartge, EU., Werther, J. et al. Bauxite washing for the removal of clay. Int J Miner Metall Mater 21, 1045–1051 (2014). https://doi.org/10.1007/s12613-014-1008-4
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DOI: https://doi.org/10.1007/s12613-014-1008-4