Akademik Veri Yönetim Sistemi
Aktaş S. (Yürütücü)
Yükseköğretim Kurumları Destekli Proje, 2012 - 2014
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 °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