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Öğe Examination of leaching of malachite ore in acetic acid/ammonium acetate solutions(Chamber of Mining Engineers of Turkey, 2013) Demirkiran N.; Asin C.; Ekmekyapar A.; Bayrakçi N.; Tanaydin M.K.Organic acids have been used as leach reagent in hydrometallurgical processing of some ores in recent years. In this study, the usability of the solutions containing acetic acid and ammonium acetate for the leaching of malachite ore was investigated. The effects of acetic acid/ammonium acetate ratio, temperature, solid to liquid ratio, and particle size on the leaching rate of malachite ore were examined. It was determined that the leaching efficiency was higher in case of high acid and low salt concentrations. It was determined that almost all copper in malachite ore was passed into solution medium. The kinetic analysis of the leaching process was done, and it was found that it followed the diffusion model through the product layer.Öğe Examination of leaching of malachite ore in ammonia/ammonium chloride solutions(Chamber of Mining Engineers of Turkey, 2013) Tanaydin M.K.; Demirkiran N.; Ekmekyapar A.In this work, the leaching of malachite, an oxidized copper ore, in ammonia/ammonium chloride solution was studied. The effects of the reaction temperature, ammonia and ammonium chloride concentration, and stirring speed on the leaching of malachite were examined. According to findings obtained, it was determined that ammonia/ammonium chloride ratio has a considerable effect on the dissolution of ore. It was observed that the dissolution rate increased with increasing temperature, and the stirring speed has not a considerable effect. The kinetic analysis of the leaching process was performed by applying the heterogeneous reaction models, and it was found that the leaching reaction followed the mixed kinetic controlled model. It was determined that the leaching reaction was controlled by diffusion at low temperatures, while it was controlled by chemical reaction at high temperatures. The activation energies for two consecutive mechanisms were calculated to be 19.5 and 50.8 kJ/mol, respectively.Öğe Investigation of the usability of oleic acid as extractant in copper extraction from aqueous solutions(Chamber of Mining Engineers of Turkey, 2013) Tanaydin M.K.; Demirkiran N.; Ekmekyapar A.Solvent extraction is applied to gain the metal from the leach solution or refine the solution. In this work, the usability of oleic acid as extractant for the gain of copper by solvent extraction method from aqueous solutions was examined. The effects of the solvent type, temperature, organic phase/aqueous phase ratio, stirring speed, and initial pH value on the extraction efficiency were studied. It was determined that the recovery efficiency of copper is low in case of using a solvent, while it is higher in case of using only oleic acid. It was observed that the amount of copper removed aqueous phase increased with increasing the stirring speed and initial pH value.
