Abstract
The leaching kinetics of calcined ulexite in ammonium carbonate was studied in this work. The effect of parameters of ammonium carbonate concentration, solid/liquid ratio, stirring speed, calcination temperature and reaction temperature was determined in the experiments. It was found that the conversion rate increased with increasing ammonium carbonate concentration, reaction temperature and decreasing solid/liquid ratio. However, the effect of stirring speed on the conversion rate was insignificant. The experimental data practised the heterogeneous and homogeneous models, and an acceptable model for the conversion rates of ulexite was determined to be a first-order pseudohomogeneous reaction model. The activation energy of dissolution process was determined to be 35.3 kJ/mol.
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References
D. E. Garret, Borates, Academic Pres Ltd., USA (1998).
A. Künkül, S. Yapıcı, M. M. Kocakerim and M. Çopur, Hydrometallurgy, 44(1–2), 135 (1997).
H. Temur, A. Yartašı, M. Çopur and M. M. Kocakerim, Ind. Eng. Chem. Res., 39, 4114 (2000).
A. Künkül, M. Tunç, S. Yapıcı, H. Eršahan and M. M. Kocakerim, Ind. Eng. Chem. Res., 36, 4847 (1997).
H. Eršahan, M. Tunç, A. Ekmekyapar and S. Yapıcı, Thermochim. Acta, 250, 125 (1995).
S. Şener, G. Özbayoğlu and Ş Demirci, Thermochimica Acta, 362,107 (2000).
F. Arslan, C. Arslan and M. S. Çelik, Powder Technology, 103, 260 (1999).
S. Şener and G. Özbayoğlu, Minerals Engineering, 8(6), 697 (1995).
R.Y. Cheng, S. P. Xia, S. H. Feng and S.Y. Gao, Chinese J. Inorg. Chem., 15(1), 125 (1999).
A. Künkül, N. Demirkıran and A. Baysar, Ind. Eng. Chem. Res., 42,982 (2003).
M. Alkan, C. Çifçi, F. Ayaz and M. Doğan, Canadian. Met. Q., 39(4), 433 (2000).
M. Alkan, M. Doğan and H. Namlı, Ind. Eng. Chem. Res., 43, 1591 (2004).
G. Tekin, Y. Onganer and M. Alkan, Canadian Met. Q., 37(2), 91 (1998).
M. Tunç, S. Yapıcı, M. M. Kocakerim and A. Yartaşı, Chem. Biochem. Eng. Q., 15(4), 175 (2001).
O. Kucuk, Korean J. Chem. Eng., 23, 21 (2006).
B. ZareNezhad, Korean J. Chem. Eng., 21, 956 (2004).
W.W. Scott, Standart methods of chemical analysis, Van Nostrand, USA (1963).
O. Levenspiel, Chemical reaction engineering, 2nd Ed., John Wiley and Sons, New York (1972).
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Künkül, A., Demirkıran, N. Dissolution kinetics of calcined ulexite in ammonium carbonate solutions. Korean J. Chem. Eng. 24, 947–952 (2007). https://doi.org/10.1007/s11814-007-0103-x
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DOI: https://doi.org/10.1007/s11814-007-0103-x