Yazar "Canbazoglu, M" seçeneğine göre listele

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    Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching
    (ELSEVIER SCIENCE BV, 2005) Bingol, D; Canbazoglu, M; Aydogan, S
    The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, [NH3]/[NH4+] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated. The main important parameters in ammonia leaching of malachite ore are determined as leaching time, ammonia/ammonium concentration ratio, pH, solid/liquid ratio, leaching temperature, and particle size. Optimum leaching conditions from malachite ore by ammonia/ammonium carbonate solution are found as ammonia/ammonium carbonate concentrations: 5 M NH4OH+0.3 M (NH4)(2)CO3; solid/liquid ratio: 1:10 g/mL; leaching times: 120 min; stirring speed: 300 rpm; leaching temperature: 25 degreesC; particle size finer than 450 mum. More than 98% of copper was effectively recovered. During the leaching, copper dissolves as in the form of Cu(NH3)(4)(+2) Complex ion, whereas gangue minerals do not react with ammonia. It was determined that interface transfer and diffusion across the product layer control the leaching process. The activation energy for dissolution was found to be 15 kJ mol(-1). (C) 2004 Elsevier B.V. All rights reserved.
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    Dissolution kinetics of sphalerite in acidic ferric chloride leaching
    (ELSEVIER SCIENCE SA, 2005) Aydogan, S; Aras, A; Canbazoglu, M
    This paper presents a study for leaching kinetics of sphalerite concentrate in FeCl3-HCl solution. The shrinking core model was applied to the results of experiments investigating the effects of stirrer speed of 200-600 rpm, ferric ion concentration in range of 0-1 M, solid/liquid ratio in range of 1/100-1/5, leaching temperature range of 40-80 degrees C and particle size on zinc dissolution rate. The activation energy for the leaching process was found to be 45.30 kJ/mol and the Arrhenius constant was calculated to be 5.454 s(-1). The order of reaction for ferric ion concentration, solid/liquid ratio and particle size were also obtained. The rate of the reaction based on reaction-controlled process can be expressed as, [1 - (1 - alpha)(1/3)] = kappa(0)(Fe3+)(0.36)((rho S/L))(-0.33) r(0)(-0.97) exp((-45300/RT))t. The dissolution of sphalerite with acidic ferric chloride solution was found to be controlled by reaction-controlled process. (c) 2005 Elsevier B.V. All rights reserved.