Investigation of Dissolution in Diammonium Hydrogen Phosphate Solutions of Gypsum
Gypsum (CaSO4.2H2O) is a mineral that is found in large quantities in the Turkey and in the World. In this study, the dissolution of this mineral in the diammonium hydrogen phosphate solutions has been studied. The dissolution and dissolution kinetics of gypsum in diammonium hydrogen phosphate solutions will be useful for evaluating of solid wastes containing gypsum. Parameters such as diammonium hydrogen phosphate concentration, temperature and stirring speed affecting on the dissolution rate of the gypsum in diammonium hydrogen phosphate solutions were investigated. In experimental studies have researched effectiveness of the selected parameters. The dissolution of gypsum were examined in two parts at low and high temperatures. The experimental results were successfully correlated by linear regression using Statistica program. Dissolution curves were evaluated shrinking core models for solidfluid systems. The activation energy was found to be 34.58 kJ/mol and 44.45 kJ/mol for the low and the high temperatures. The dissolution of gypsum was controlled by chemical reaction both low temperatures and high temperatures.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1100519Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1685
 Anonim, “Türkiye’nin Doğal Kaynakları” http://www.marbleport.com. pp. 1-10.
 Anonim, “Jips Bugünü ve Geleceği, Metal Teknoloji Platformu Oluşturma Çalıştayı”, Tübitak, Ankara, 2003, pp. 1-74.
 Anonim, “Türkiye Sanayi Sektörünün Değerlendirilmesi”, Türkiye Cumhuriyeti Bilim Sanayi ve Teknoloji Bakanlığı, Ankara, 2011, pp. 1- 55.
 M. Yeşilyurt, S. Çolak, T. Çalban and Y. Genel, “Determination of the optimum conditions for the dissolution of colemanite in H3PO4 solutions”, Ind. Eng. Chem. Res., vol.44, 2005, pp. 3761-3765.
 T. Çalban, S. Çolak and M. Yeşilyurt, “Optimization of Leaching of Copper from Oxidized Copper Ore in NH3-(NH4)2SO4 Medium”, Chem. Eng. Comm., vol. 192, 2005, pp. 1515-1524.
 M. Sokic, B. Markovic, V. Matkovic, D. Zivkovic, N. Strbac and J. Stojanovic, “Kinetics and Mechanism of Sphalerite Leaching by Sodium Nitrate in Sulphuric Acid Solution”, Journal of Mining and Metallurgy, vol. 48 (2), 2012, pp. 185-195.
 B. Xue, Y. Shao-hua, L. Yao and W. Wen-yuan, “Leaching Kinetics of Bastnaesite Concentrate in HCl Solution”, Trans. Nonferrous Met. Soc. of China, vol. 21, 2011, pp. 2306-2310.
 T. Çalban, B. Kaynarca, S. Kuşlu, S. Çolak, “Leaching kinetics of Chevreul’s salt in hydrochloric acid solutions”, Journal of Ind. and Eng. Chem., vol. 20, 2014, pp. 1141-1147.
 T. Çalban, E. Kavcı, “Removal of Calcium from Soda Liquid Waste Containing Calcium Chloride”, Energy Sources: Part A, vol. 32, 2010, pp. 407-418.
 H. Gülensoy, “Kompleksometrinin Temelleri ve Kompleksometrik Titrasyonlar”, Fatih Yayınevi, İstanbul, 1984.
 E. Kavcı, T. Çalban, S. Kuşlu, S. Çolak, “Leaching kinetics of ulexite in sodium hydrogen sulphate solutions”, Journal of Industrial an Engineering Chemistry, vol. 20, 2014, 2625.
 O. Levenspiel, “Chemical Reaction Engineering”, Wiley, 2nd edition: NewYork, 1972.
 F. Habashi, “Kinetics of Metallurgical Processes”, 1999.
 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, p. 764.
 B. Dönmez, F. Demir, O. Lacin, “Leaching kinetics of calcined magnesite in acetic acid solutions”, Journal of Industrial an Engineering Chemistry, vol. 15, 2009, p. 865.
 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, p. 673.
 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, p. 38.