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tri-n-octylamine
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A Detailed Study on Extraction of Uranium from Mother Leach Liquor (of Uranium Mills) by TOA Extractant and Development of a Thermodynamical Model for it
, M.Sc. Thesis Sharif University of Technology ; Samadfam, Mohammad (Supervisor) ; Safdari, Jaber (Supervisor) ; Mallah, Hassan (Co-Advisor)
Abstract
In many uranium mines such as gachin-bandarabbas, sulfuric acid is used for leaching operation on ore after crushing operation. This leach liquor, containing uranium, is extracted by specific solvent, including extractant like TOA. However, this operation, named Amex, have been used for many years, there is a vacancy for a detailed thermodynamical studying on uranium extraction from leach liquor.To have a thermodynamical model, we need information about the equilibrium concentration of all the components that may have effect on uranium extraction and also concentration of solvent, pH, phase ratio and activity coefficient alteration. This model must have the ability to predict the equilibrium...
Fabrication of Magnetite-based Superparamagnetic Nanoadsorbents Coated with Organic Extractants
, Ph.D. Dissertation Sharif University of Technology ; Nemati, Ali (Supervisor) ; Sadrnezhaad, Khatiboleslam (Co-Supervisor)
Abstract
In this study, the fabrication of magnetic nanoadsorbents functionalized with organic extractant compounds has been investigated for potential applications in the hydrometallurgical extraction of metal ions. For this purpose, spherical superparamagnetic magnetite nanoparticles of about 15 nm size were synthesized via the chemical co-precipitation method. Then, an intermediate stearic acid single layer was coated on the surface of nanoparticles, aiming to improve stability and facilitate the subsequent functionalization with organic extractants. The fabrication procedure of nanoadsorbents was completed by physical adsorption of D2EHPA, TBP, and TOA compounds on the intermediate coating. The...