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AKTAŞ, SERDAR

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2012 - 20182
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    Recovery of Ruthenium Via Zinc in the Presence of Accelerator
    (SPRINGER INDIA, 2018) AKTAŞ, SERDAR; Aktas, Serdar; Morcali, Mehmet Hakan; Aksu, Kemal; Aksoy, Burak
    In this study, the recovery of ruthenium from spent bath solutions via cementation reaction with zinc powder was investigated. Studied parameters included the quantity of zinc, reaction temperature, reaction time and sodium chloride additions to understand their effects on the reaction. Tests were performed in a temperature controlled water-bath with temperatures between 20 and 70 A degrees C at atmospheric pressure. Furthermore, in order to determine activation energy of cementation reaction, several mathematical kinetic models were used and the activation energy, which was calculated from best fit, was found to be 12.48 kJ/mol. Addition of sodium chloride to the solution greatly accelerated the cementation reaction, in that, more the addition of sodium chloride, the better was the precipitation efficiency. In the absence of sodium chloride at 25 A degrees C a percentage of ruthenium recovery was below 75% whereas 1000 mg sodium chloride addition at 65 A degrees C ensured a percentage of ruthenium recovery more than 95%. This corresponded to more than about 28% increase.
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    Cementation of rhodium from waste chloride solutions using copper powder
    (ELSEVIER SCIENCE BV, 2012) AKTAŞ, SERDAR; Aktas, Serdar
    This work investigated the cementation of rhodium from waste chloride solutions using metallic copper powder. The effects on the rhodium precipitation (%) caused by the quantity of copper, reaction temperature and reaction time were explored in detail. In addition, the cementation kinetics of rhodium were studied, and the activation energy was determined to be 64.48 kJ/mol, which indicates that the reaction is chemically controlled. It was demonstrated that less than 40% of the rhodium could be precipitated using excessive quantities of copper powder (e.g., stoichiometric ratio of Cu/Rh = 40.3) at room temperature for 1 h, which resulted in a cementation reaction that was too slow. Increasing the reaction temperature to 55 degrees C resulted in almost 99% cementation after 1 h, even using stoichiometric ratio of Cu/Rh = 16.1. After a detailed observation of the dissolution behavior of the copper powder during the cementation process, it was demonstrated that most of the copper is preferentially consumed by free acid, a finding corroborated by pH measurements. (C) 2012 Elsevier B.V. All rights reserved.