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Dissolution kinetics of Amazonian metakaolin in hydrochloric acid

  • Paula E.A. Lima (a1), Rômulo S. Angélica (a1) and Roberto F. Neves (a2)


The kinetics of dissolution of Amazonian metakaolin in hydrochloric acid (HCl) was studied using the ‘Shrinking Core Model’ for spherical and ‘flat plate’ particles of constant size. The Amazonian kaolin was calcined at 700°C for 2 h. The calcined samples (metakaolins) were leached in an HCl solution with 5% excess at 70, 80 and 95 ± 3°C for 3 h. Samples were collected every 15 min and subjected to Al analysis by the EDTA titrimetric method. Experimental data showed that the spherical morphology produced a better fit with respect to the regression coefficients. The activation energy of the reaction was 90.6 kJ/mol. The chemical process is a first-order leaching reaction. The results of the present study are consistent with those from previous research on this topic, which used HCl with an excess of >90%.


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Ajemba, R.O. & Onukwuli, O.D. (2012) Kinetic model for Ukpor clay dissolution in hydrochloric acid solution. Journal of Emerging Trends in Engineering and Applied Sciences, 3, 44854.
Altiokka, M.R. & Hosgün, H.L. (2003) Investigation of the dissolution kinetics of kaolin in HCl solution. Hydrometallurgy, 68, 7781.
Altiokka, M.R., Akalin, H., Melek, N. & Akyalçin, S. (2010) Investigation of the dissolution kinetics of meta-kaolin in H2SO4 solution. Industrial & Engineering Chemistry Research, 49, 1237912382.
Al-Zahrani, A.A. & Abdul-Majid, M.H. (2009) Extraction of alumina from local clays by hydrochloric acid process. Journal of King Abdulaziz University: Engineering Sciences, 20, 2941.
Belver, C., Muñoz, M.A.B. & Vicente, M.A. (2002a) Chemical activation of a kaolinite under acid and alkaline conditions. Chemistry of Materials, 14, 20332043.
Belver, C., Bañares, M.A. & Vicente, M.A. (2002b) Preparation of porous silica by acid activation of metakaolins. Studies in Surface Science and Catalysis, 144, 307314.
Bergaya, F., Dion, P., Alcover, J.F., Clinard, C. & Tchoubar, D. (1996) TEM study of kaolinite thermal decomposition by controlled rate thermal analysis. Journal of Materials Science, 31, 50695075.
Colina, F.G., Esplugas, S. & Costa, J. (2002) High-temperature reaction of kaolin with sulfuric acid. Industrial & Engineering Chemistry Research, 41, 41684173.
Costa, M.L., Sousa, D.J.L. & Angelica, R.S. (2009) The contribution of lateritization processes to the formation of the kaolin deposits from eastern Amazon. Journal of South American Earth Sciences, 27, 219234.
Fogler, H.S. (1999) Elements of Chemical Reaction Engineering. Prentice Hall International Editions, New Jersey, USA.
Gajam, S.Y. & Raghavan, S. (1985) A kinetic model for the hydrochloric acid leaching of kaolinite clay in the presence of fluoride ions. Hydrometallurgy, 15, 143158.
Hulbert, S.F. & Huff, D.E. (1970) Kinetics of alumina removal from a calcined kaolin with nitric, sulphuric and hydrochloric acids. Clay Minerals, 8, 337345.
Kotz, J.C. & Treichel, P. (1999) Chemistry and Chemical Reactivity. Saunders College Publishing, Florida, USA.
Levenspiel, O. (1972) Chemical Reaction Engineering. Wiley Press, New York.
Lima, P.E.A., Angélica, R.S. & Neves, R.F. (2014) Dissolution kinetics of metakaolin in sulfuric acid: Comparison between heterogeneous and homogeneous reaction methods. Applied Clay Science, 88-89, 159162.
Morris, H.H. & Gunn, F.A. (1960) Kaolin. Industrial and Engineering Chemistry, 52, 370376.
Murray, H.H., Alves, C.A. & Bastos, C.H. (2007) Mining, processing and applications of the Capim Basin kaolin, Brazil. Clay Minerals, 42, 145151.
Mussel, W.N., Murad, E., Criscuolo, P.S.R., Pinheiro, P.G. & Fabris, J.D. (2008) Variation of mineralogy during the beneficiation of Capim kaolin from Para, Brazil. Clay Minerals, 43, 381391.
Santos, P.S. (1989) Ciência e Tecnologia deArgilas. Edgar Blücher, São Paulo.
Santos, E., Scorzelli, R.B., Bertolino, L.C., Alves, O.C. & Munayco, P. (2012) Characterization of kaolin from the Capim River region, Brazil. Applied Clay Science, 55, 164167.



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