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Nickel and other impurities concentration and avoiding copper cathode contamination, a certain volume of electrolyte is withdrawn continuously from the circulation system and replaced by fresh electrolyte.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... 

Collapsible soils have been encountered in many parts of the world such as Gorgan (a city in North of Iran). In these soils, sudden and large volume changes occur while the water content, loading pressure or both, are passed a threshold limit. One of the serious problems that may occur in the structures constructed on collapsible soils is the catastrophic settlements resulting from increase of water content in the soils. In this research, improvement of mechanical properties of loessial collapsible soil taken from Gorgan has been investigated using biocementation method. There are some microbial processes that can lead to biocementation, which one of them is microbially induced calcite...