Yazar "Canbazoğlu, Mehmet" seçeneğine göre listele

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    Oxidative ammonia leaching of sphalerite concentrate
    (Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2005) Aydoğan, Salih; Aras, Ali; Canbazoğlu, Mehmet
    This paper presents a study of kinetics of leaching of sphalerite concentrate in ammonia solutions. The effects of ammonia concentration, oxygen partial pressure, reaction temperature and particle size on the leaching rate were investigated. The shrinking core model was applied to the results obtained from these experiments. Reaction order with respect to PO2 (1-10 atm.) and NH3 concentration (1.05-5.20 M) were 0.22 and 0.63 and the activation energy was determined to be 43.59 kj/mol in the temperature range of 90-130 °C. In addition, the apparent rate constant is in inverse relationship with the mean initial particle radius. The results of this study showed that the leaching of sphalerite was a reaction controlled process.
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    Recovering of Ni, Co and Cu from Divrigi Iron Plant tailings by sulphuric acid oxygen pressure leaching
    (2006) Canbazoğlu, Mehmet; Kaya, Oktay; Akdemir, Ünal; İnan, Aslı; Aydoğan, Salih
    Turkish Iron and Steel Company at its Divrigi concentrator plant produces magnetite concentrate for sintering using dry and wet magnetic separation. Nearly 750.000 tons of tailings are sent to tailings dam from Divrigi concentrator every year. These tailings contain 0.11 % Cu, 0.145 % Co, 0.35 % Ni, 0.25 g/t Au and 2.2 g/t Ag. The mineralogical composition of these tailings is complex and the minerals of the important metals are present as oxide and sulphides showing fine-grained structure. In this study, the recovery of these metals as Cu, Co and Ni was investigated, using oxidative sulphuric acid pressure leaching. The investigated parameters were leaching time (1 to 8 h), leaching pH (0.5 to 2), leaching temperature (110 °C to 180 °C) and partial oxygen pressure (1 to 6 bar). Under the optimum experimental conditions that were 4 h of leaching, 0.5 pH, temperature of 110 °C and oxygen pressure of 4 bar, the obtained recoveries were 64.10% Ni, 65.01% Co and 76.40% Cu.