Sharif Digital Repository

In copper electrorefining process, to control Nickel and other impurities concentration and avoiding copper cathode contamination, a certain volume of electrolyte is withdrawn continuously from the circulation system and replaced by fresh electrolyte. The spent electrolyte includes valuable elements such as Nickel, Copper, Iron and also great value of sulfuric acid which is worthwhile to be recycled. Solvent Displacement Crystallization (SDC) method is suitable for this purpose because it retains significant amount of acid and have low energy consumption. The present work studies the using of SDC method to recover Nickel and other impurities from Sarcheshme Copper bleed solution and... 

In this research, antimony extraction by hydrometallurgical method has been investigated using an alkaline medium. Stibnite ore, as a source of antimony was leached in alkali potassium hydroxide solution. Furthermore, related kinetic equations and process factors were also studied. It was determined that optimum conditions occure when the concentration of KOH is 0.5 mol /L, the solid to liquid ratio is 100 g/L, the reaction temperature is 25 °C, and the process is performed in 115 minutes. It was found that diffusion through the ash layer controls the reaction kinetics during the first 60 minutes. Finally, for the first time, the effect of different parameters on antimony electrowinning was...