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Öğe Dissolution Kinetics of Celestite (SrSO4) in HCl Solution with BaCl2(Elsevier Science Bv, 2006) Aydoğan, Salih; Erdemoğlu, Murat; Aras, Ali; Uçar, Gökhan; Özkan, AlperLeaching of celestite (SrSO4) in hydrochloric acid solution with BaCl2 was investigated to produce SrCl2 in solution, which is the main source for SrCO3. The effects of variables such as stirring speed, BaCl2 and HCl concentrations, and temperature and particle size, and also the presence of NaCl in the leaching solution were studied. The leaching was modeled according to the shrinking core model. The activation energy for the leaching process in 8.25 x 10(-3) M BaCl2 solution equilibrated with 0.5 M HCl was found as 68.8 U mol(-1). This value reveals that the dissolution of celestite is a chemical reaction controlled process. In agreement with the model, the reaction rate is inversely proportional to the particle size and increases as 0.73, 0.70 and 0. 19 powers of the H+, Cl- and Ba2+ concentrations, respectively.Öğe LEACHING OF CHALCOPYRITE CONCENTRATE IN HYDROGEN PEROXIDE SOLUTION(OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, 2014) Ağaçayak, Tevfik; Aras, Ali; Aydoğan, Salih; Erdemoğlu, MuratThe leaching conditions of chalcopyrite (CuFeS2) concentrate in a hydrogen peroxide medium were investigated by studying the effects of its leaching parameters, such as stirring speed, temperature, hydrogen peroxide concentration and the particle size of the concentrate on Cu extraction. It was found that stirring speed has no effect on the leaching. Copper extraction from chalcopyrite is directly proportional to hydrogen peroxide concentration, but the extraction decreases at temperatures above 60 degrees C. The maximum copper extraction was obtained with the following conditions without stirring: 240 min of leaching time, 3.0 M hydrogen peroxide concentration, 40 degrees C leaching temperature and 53-75. m particle size fraction.
