Kinetic Study of the Leaching of Iraqi Akashat Phosphate Ore Using Lactic Acid
Abstract
In the present work, a kinetic study was performed to the extraction of phosphate from Iraqi Akashat phosphate ore using organic acid. Leaching was studied using lactic acid for the separation of calcareous materials (mainly calcite). Reaction conditions were 2% by weight acid concentration and 5ml/gm of acid volume to ore weight ratio. Reaction time was taken in the range 2 to 30 minutes (step 2 minutes) to determine the reaction rate constant k based on the change in calcite concentration. To determine value of activation energy when reaction temperature is varied from 25 to 65 , another investigation was accomplished. Through the kinetic data, it was found that selective leaching was controlled by surface chemical reaction. The study showed that the reaction kinetics was specifically described by the shrinking core model (SCM). Regression analyses gave values of activation energy (Ea) and Arrhenius constant (ko) as 40.108 KJ/mole and (2.256 103 sec-1) respectively.
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References
Abouzeid, A.Z., 2008. “Physical and thermal treatment of phosphate ores-An overview”. Int. J. Miner. Process. 85, pp. 59–84.
Becker, P., 1983. “Phosphates and Phosphoric Acid: Fertilizer Science and Technology Series”. Vol. 3, Marcel Dekker Inc., New York.
Bilgic, S., 2002. “The inhibition effects of benzoic acid salicylic acid on the corrosion of steel in sulfuric acid medium”. Materials Chemistry and Physics, 76, pp. 52–58.
Cussler, E.L., 2007, “DIFFUSION, Mass Transfer in Fluid Systems”, 3d Ed, Cambridge University Press, United Kingdom.
Gharabaghi, M., Irannajad, M. and Noaparast, M., 2010. “A review of the beneficiation of calcareous phosphate ores using organic acid leaching”, Hydrometallurgy, 103, pp. 96–107.
Gharabaghi, M., Noaparast, M. and Irannajad, M., 2009. “Selective leaching kinetics of low grade calcareous phosphate ore in acetic acid”, Hydrometallurgy, 95, pp. 341–345.
Gremillion, L.R. & McClellan, G.H. 1975. “Importance of chemical and mineralogical data in evaluating apatitic phosphate ores”. Society of Mining Engineers of AIME. Transactions, 270.
Guimarães, R.C., Araujo, A.C. and Peres, A.E.C., 2005. “Reagents in igneous phosphate ores flotation”. Minerals Engineering, 18, pp. 199-204.
Haweel, C. K., Basma, H., Abdulmajeed, A. and Eisa, M.Y. 2013, Beneficiation of Iraqi Akashat phosphate ore using organic acid leaching. Al- Khwarizmi Eng. J., 9(4): 24 38
Heidarpour, T., 2009. “Processing of Dalir phosphate samples using leaching method”, M.Sc. Thesis, Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Iran.
Hem, S.R., 1993. “Kinetics of Metallurgical Reactions”. Oxford and IBM Pub. Co., New Delhi.
Kirk-Othmer, 1998. “Encyclopedia of Chemical Technology”, 4th Ed, John Wiley & Sons Inc., 18, pp.323.
Kunii, D., and Levenspiel, O., 1991. “Fluidization Engineering, 2nd Ed”, Butterworth, Boston, MA, USA.
Malash, G.F., 2005. “Beneficiation of Abu Tartur phosphate rock by leaching with dilute acetic acid solution”, Alexandria Engineering Journal, 44, 2, pp.339–345.
Octave, L., 1999. “Chemical Reaction Engineering, 3d edition”. John Wiley & Sons, New York, USA.
Ozer, A.K., 2003. “The characteristics of phosphate rock in a fluidized bed for the upgrading”. Advanced Powder Technology, 14, 1, pp.33-42.
Rao, T.C., Rao, L.S. and Rao, G.M., 1992. “Beneficiation of Indian low grade phosphate deposits: problems and prospects”, Transactions of the Indian Institute of Metals, 45, 3, pp.195–205.
Sluis, Van Der, 1987. “A Clean Technology Phosphoric Acid Process”. Ph.D. thesis, Delft University Press, Netherlands.
Straaten, P.V., 2002. “Rocks for Crops, Agro minerals of sub-Sahara Africa”. Nairobi, Kenya, pp.7-24.
Yagi, S., and Kunii, D., 1955, 5th Symposium (International) on Combustion, Reinhold, New York; Chem. Eng. (Japan), 19, 500, pp.231.
Zafar, Z.I. and Ashraf, M., 2007. “Selective leaching kinetics of calcareous phosphate rock in lactic acid”, Chemical Engineering Journal, 131, pp.41-48.
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