Kinetic study on the leaching of calcined magnesite in gluconic acid solutions

Bahar Bayrak; Oral Lacin; Hanifi Sarac

Journal of Industrial and Engineering Chemistry, Vol.16, No.3, 479-484, May, 2010

DOI10.1016/j.jiec.2010.01.055 Export Citation

Kinetic study on the leaching of calcined magnesite in gluconic acid solutions

Bahar Bayrak, Oral Lacin^†, and Hanifi Sarac

Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey

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A kinetic study on the leaching of calcinedmagnesite in aqueous gluconic acid solutionswas investigated in batch reactor employing the parameters of particle size, temperature, stirring speed, solid.liquid ratio and acid concentration. A mathematical model was evaluated for the rate increased with decreasing particle size and increasing temperature and initially, the leaching in terms of acid concentration and then fell with increasing concentration. It was found in the study that stirring speed was not effective on leaching rate. The leaching rate decreases as solid.liquid ratio increases. It was shown that the mathematical model for calcined magnesite particle was: - 1.9041In((1-X(B))^(1/3)+1.157)+0.952In((1-X(B))^(2/3)-1.156(1-X(B))^(1/3)+1.338) - 3.298arctan(0.577(1.73(1-X(B))^(1/3)-1))=(3bkSC(AO)/ρB^(R))t Dissolution curves were evaluated in order to test shrinking core models for fluid.solid systems. Consequently, it was determined that the leaching rate is controlled by surface chemical reaction. In addition, the fact that dissolution was controlled by the surface chemical reaction was also supported with the relationship between the rate constant and the particle radius. The activation energy of the process was determined to be 32.88 kJ mol^(-1).

Keywords:Magnesite;Gluconic acid;Chemical dissolution;Kinetics;Calcination

[References]

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Bayrak B, Lacin O, Bakan F, Sarac H, Chem. Eng. J., 117(2), 109 (2006)
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Hursit M, Lac¸in O, Sarac H, J. Taiwan Inst. Chem. Eng., 40, 6 (2009)
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Donmez B, Demir F, Lacin O, J. Ind. Eng. Chem., 15(6), 865 (2009)
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Lac¸in O, Do¨nmez B, Demir F, Int. J. Miner. Process., 75, 91 (2005)
Tekin T, Tekin D, Bayramog˘lu M, Ultrasonics Sonochem., 8, 373 (2001)

[Referenced By]

[1] Markus H, Fugleberg S, Valtakari D, Salmi T, Murzin DY, Lahtinen M, Chem. Eng. Sci., 59(4), 919 (2004)

[2] Ekmekyapar A, Demirkiran N, Kunkul A, Chem. Eng. Res. Des., 86(9A), 1011 (2008)

[3] Zafar ZI, Ashraf M, Chem. Eng. J., 131(1-3), 41 (2007)

[4] Abali Y, Bayca SU, Mistincik E, Chem. Eng. J., 123(1-2), 25 (2006)

[5] Zafar ZI, Chem. Eng. J., 141(1-3), 233 (2008)

[6] Aydogan S, Chem. Eng. J., 123(3), 65 (2006)

[7] Uc¸ar G, Hydrometallurgy., 95, 39 (2009)

[8] Bayrak B, Lacin O, Bakan F, Sarac H, Chem. Eng. J., 117(2), 109 (2006)

[9] Havuz T, Do¨nmez B, C¸elik C, J. Ind. Eng. Chem., doi:10.1016/j.jiec.2009.10.001. (2010)

[10] Hursit M, Lac¸in O, Sarac H, J. Taiwan Inst. Chem. Eng., 40, 6 (2009)

[11] Lee WK, Lee SM, Kim HM, J. Ind. Eng. Chem., 15(5), 677 (2009)

[12] Raschman P, Fedorockova A, Hydrometallurgy., 71, 403 (2004)

[13] Alkan M, Dogan M, Chem. Eng. Process., 43(7), 867 (2004)

[14] Raschman P, Hydrometallurgy., 56, 109 (2000)

[15] Donmez B, Demir F, Lacin O, J. Ind. Eng. Chem., 15(6), 865 (2009)

[16] ERSAHAN H, EKMEKYAPAR A, SEVIM F, Int. J. Miner. Process., 42(1), 121 (1994)

[17] Lanquenz H, Glasner A, Austrian Appl., 7916, 12 (1979)

[18] Das A, Kundu PN, J. Sci. Ind. Res., 46, 307 (1987)

[19] Min BY, Choi WK, Oh WZ, Jung CH, Lee KW, J. Ind. Eng. Chem., 15(1), 31 (2009)

[20] Sawyer DT, Chem. Rev., 64, 633 (1964)

[21] Milsom PE, Meers JL, in: Moo-Young M (Ed.), Comprehensive Biotechnol, vol. 3, Pergamon Press, Oxford, 681 (1985)

[22] Furmann NH, Standart Methods of Chemical Analysis, 6th ad., D.Van. Nastrand Company, New Jersey (1963)

[23] Gu¨ lensoy H, Kompleksometrik Titrasyonlar ve Kompleksometrinin Temelleri, Fatih Yayınevi, I˙ stanbul (1974)

[24] Levenspiel O, Chemical Reaction Engineering, 3rd Edition, John Wiley and Sons Inc., New York (1999)

[25] Marinovic V, Despic AR, J. Electroanal. Chem., 431(1), 127 (1997)

[26] Lac¸in O, Do¨nmez B, Demir F, Int. J. Miner. Process., 75, 91 (2005)

[27] Tekin T, Tekin D, Bayramog˘lu M, Ultrasonics Sonochem., 8, 373 (2001)