Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32759
Dissolution Leaching Kinetics of Ulexite in Sodium Dihydrogen Phosphate Solutions

Authors: Emine Teke, Soner Kuşlu, Sabri Çolak, Turan Çalban

Abstract:

The aim of the present study was to investigate the dissolution kinetics of ulexite in sodium dihydrogen phosphate in a mechanical agitation system and also to declare an alternative reactant to produce the boric acid. Reaction temperature, concentration of sodium dihydrogen phosphate, stirring speed, solid-liquid ratio, and ulexite particle size were selected as parameters. The experimental results were successfully correlated by using linear regression and a statistical program. Dissolution curves were evaluated in order to test the shrinking core models for solid-fluid systems. It was observed that increase in the reaction temperature and decrease in the solid/liquid ratio causes an increase in the dissolution rate of ulexite. The activation energy was found to be 36.4 kJ/mol. The leaching of ulexite was controlled by diffusion through the ash (or product) layer.

Keywords: Sodium dihydrogen phosphate, leaching kinetics, ulexite.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1125921

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1516

References:


[1] A. Konuk, H. Kurama, H. Ak, M. İphar,4th International Boron Symposium, Book of Proceedings, 15-17 October 2009, Eskişehir, Türkiye, ISBN: 978-9944-89-790-7.
[2] B. Onat, S. Şener, A. Mergen, U. Bilici, 1ts National Boron Symposium, Book of Proceedings, 28-29 April 2005, Ankara, Türkiye, ISBN: 975-8964-22-4.
[3] T.W. Davies, S. Çolak, R.M. Hooper, “Boric-acid production by the calcination and leaching of powdered colemanite”, Powder Technology, Vol. 65, 1991, pp. 433-438.
[4] H.P. Kemp, The Chemistry of Borates: Part I. Borax Consolidated Ltd: London 1956.
[5] A. Gur, “Dissolution mechanism of colemanite in sulplunic acid solutions” . Korean Journal of Chemical Engineering, Vol. 24, 2007, pp. 588-594.
[6] M. Alkan, M. M. Kocakerim, “Dissolution kinetics of ulexite in water by sulphurdioxide”, Journal of Chemical Technology and Biotechnolgy, Vol. 40, 1987, pp. 215-223.
[7] M. M. Kocakerim, S. Çolak, S. T. Davies, M. Alkan, “Dissolution kinetics of ulexite in CO2-saturated water”. Canadian Metallurgical Quarterly, Vol. 32, 1993, pp. 393-397.
[8] A. Künkül, S. Yapıcı, M.M. Kocakerim, M. Copur, “Dissolution kinetics of ulexite in ammonia solutions saturated with CO2”. Hydometallurgy, Vol. 44, 1997, pp. 135-142.
[9] G. Tekin, Y. Onganer, M. Alkan, “Dissolution kinetics of ulexite in ammonium chloride solution”. Canadian Metallurgical Quarterly, Vol. 37, 1998, pp. 91-97.
[10] M. Tunç, M.M. Kocakerim, S. Yapıcı, S. Bayrakçeken, “Dissolution mechanism of ulexite in H2SO4 solution”. Hydrometallurgy, Vol. 51, 1999, pp. 359-366.
[11] M. Alkan, C. Çifçi, F. Ayaz, F. Doğan, F. “Dissolution kinetics of ulexite in aqueous EDTA solutions”. Canadian Metallurgical Quarterly, Vol. 39, 2000, pp. 433-439.
[12] M. Alkan, M. Doğan, “Dissolution kinetics of colemanite in oxalic acid solutions”. Chemical Engineering and Processing Vol. 43, 2004, pp. 867-870.
[13] A. Künkül, N. Demirkıran, A. Baysar, “Dissolution kinetics of ulexite in ammonium sulfate solutions”. Ind. Eng. Chem. Res. Vol. 42, 2003, pp. 982-986.
[14] N. Demirkıran, A. Künkül, “Dissolution kinetics of ulexite in perchloric acid solutions”. International Journal of Mineral and Processing, Vol. 83, 2007, pp. 76-81.
[15] A. Ekmekyapar, N. Demirkıran, A. Künkül, “Dissolution kinetics of ulexite in acetic acid solutions”. Chemical Engineering Research and Design, Vol. 86, 2008, pp. 1011-1017.
[16] N. Demirkıran, “A study on dissolution of ulexite in ammonium acetate solutions”, Chemical Engineering Journal, Vol. 141, 2008, pp. 180-186.
[17] N. Demirkıran, “Dissolution kinetics of ulexite in ammonium nitrate solutions”. Hydrometallurgy, Vol. 95, 2009, pp. 198-203.
[18] N. Demirkıran, A. Künkül, “Dissolution kinetics of ulexite prepared under different calcination temperatures”. Brazilian Journal of Chemical Engineering, Vol. 25, 2008, pp. 751-757.
[19] A. Gür, “Dissolution kinetics of calcined ulexite in ammonium chloride solutions at high solid-to- liquid ratios”. Acta Phys.-Chim. Sin., Vol. 22, 2006, pp. 1287-1294.
[20] E. Kavcı, T. Çalban,S. Kuşlu, S. Çolak, S. “Leaching kinetics of ulexite in sodium hydrogen sulphate solutions”. Journal of Industrial an Engineering Chemistry, Vol. 20, 2014, pp. 2625-2632.
[21] A.A. Nemodruk, Z.K. Karalova, Analytical Chemistry of Boron. vol. 1, section 2, Israel Program for Scientific Translations, Jerusalem, Vol. 33, 1965, 33.
[22] D. A. Sookg, D.W. West, F.J. Holler, Fundamentals of Analytical Chemistry, Seventh Edition, Saunders College Publishing, 1996.
[23] O. Levenspiel, Chemical Reaction Engineering. Wiley, 2nd edition: NewYork, 1972.
[24] F. Habashi, Kinetics of Metallurgical Processes, 1999.
[25] A. Ekmekyapar, E. Aktaş, A. Künkül, N. Demirkıran, “Investigation of leaching kinetics of copper from malachite ore in ammonium nitrate solutions”. Metallurgical and Materials Transactions B, Vol. 43B, 2012, pp. 764-770.
[26] B. Dönmez, F. Demir, O. Lacin, “Leaching kinetics of calcined magnesite in acetic acid solutions”. Journal of Industrial an Engineering Chemistry, Vol. 15, 2009, pp. 865-871.
[27] S. Kuşlu, F.Ç. Dişli, S. Çolak, “Leaching kinetics of ulexite in borax pentahydrate solutions saturated with carbon dioxide”. Journal of Industrial an Engineering Chemistry Vol. 16, 2010, pp. 673-679.
[28] T. Çalban, B. Kaynarca, S. Kuşlu, S. Çolak, “Leaching Kinetics of Chevreul’s Salt in Hydrochloric Acid Solutions”. Journal of Industrial and Engineering Chemistry, Vol. 20, 2014, pp. 1141-1146.
[29] R. Guliyev, S. Kuşlu, T. Çalban, S. Çolak, “Leaching kinetics of colemanite in potassium hydrogen sulphate solutions”. Journal of Industrial and Engineering Chemistry, Vol. 18, 2012, pp. 38-43.
[30] M. Tunç, M.M. Kocakerim, Ö. Küçük, M. Aluz, “Dissolution of colemanite in (NH4)2SO4 solutions”. Korean Journal of Chemical Engineering, Vol. 24, 2007, pp. 55-60.
[31] E. Jackson, Hydrometallurgical extraction and reclamation; Ellis Horwood Ltd.; Chichester, 1986, pp. 400-403.