TY - JFULL AU - Turan Çalban and Nursel Keskin and Sabri Çolak and Soner Kuşlu PY - 2015/5/ TI - Investigation of Dissolution in Diammonium Hydrogen Phosphate Solutions of Gypsum T2 - International Journal of Chemical and Molecular Engineering SP - 366 EP - 370 VL - 9 SN - 1307-6892 UR - https://publications.waset.org/pdf/10001139 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 100, 2015 N2 - 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. ER -