Yazar "Ozdemir, G. Deniz Turhan" seçeneğine göre listele

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    APPLICATION OF RESPONSE SURFACE METHOD TO COPPER CEMENTATION BY METALLIC ALUMINUM PARTICLES
    (Lviv Polytech Natl Univ, 2020) Demirkiran, Nizamettin; Ozdemir, G. Deniz Turhan; Dardagan, Merve
    In the present study, the interactive effects of the process variables containing copper concentration, temperature, and time on the efficiency of copper cementation by metallic aluminum particles were examined by using response surface methodology (RSM). It was observed that the efficiency of cementation increased with an increase in the initial concentration of copper, temperature and time. The multiple regression analysis to the experimental data was applied to see the interactive effects of process variables. The second-order polynomial equation was obtained. The optimal values were found to be 0.075 mol/l, 303 K, and 90 min to maximize the amount of the deposited copper.
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    Dissolution kinetics of calcined ulexite in ammonium sulfate solutions
    (Cenim, 2018) Demirkiran, Nizamettin; Tanaydin, Mehmet Kayra; Ozdemir, G. Deniz Turhan
    Ulexite is one of the boron minerals, which include a respectable amount of hydration water. It can be used as a raw material in the production of boron compounds. Some part of water in the composition of ulexite can be removed from the solid matrix applying dehydration treatment, and a porous structure can be obtained to increase the reaction rate. In the present study, the effect of dehydration temperature on dissolution kinetics of ulexite in ammonium sulfate solutions was researched in a batch reactor utilizing the parameters of solution concentration, solid-to-liquid ratio, stirring speed and reaction temperature. It was determined that the dissolution rate of calcined material increased with increasing solution concentration and reaction temperature and with decreasing solid-to-liquid ratio. The highest dissolution rate was attained with the sample calcined at 150 degrees C. It was found that the dissolution rate fit to the first order pseudo-homogeneous model. The activation energy of the dissolution process was estimated to be 42 kJ.mol(-1).
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    KINETIC MODEL FOR DISSOLUTION OF CEMENT COPPER IN SULFURIC ACID SOLUTIONS CONTAINING CUPRIC IONS
    (Lviv Polytech Natl Univ, 2021) Demirkiran, Nizamettin; Ozdemir, G. Deniz Turhan
    In this paper, the dissolution kinetics of cement copper powder in sulfuric acid solutions containing cupric ions was examined. It was observed that the dissolution rate of copper increased with increasing the acid concentration, temperature, and stirring speed. It was determined that the dissolution rate of copper enhanced with increasing the cupric ion concentration up to 0.025 M. It was found that the temperature and concentration of cupric ion had more considerable effects on the dissolution of copper powder. The kinetic analysis of the process was performed, and it was observed that it fits the first order pseudo-homogenous reaction model. The activation energy was calculated to be 31.1 kJ/mol.