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    Simulation of Direct Reduction Shaft Furnace Based on Inverse Method

    , M.Sc. Thesis Sharif University of Technology Beikzadeh, Pouria (Author) ; Saboohi, Yadollah (Supervisor)
    DIRECT reduction is a process for reducing iron ore in the solid state. The product is in the form of sponge iron. This can be used directly as a raw material for steelmaking in an electric arc furnace. MIDREX process produces more than 60 percent of global DRI production. Because of high potential natural gas and iron ore resources in Iran and also lack of scarp, MIDREX direct reduction process is feasible. The main function of the MIDREX shaft furnace is to generate sponge iron from iron ore. The solids flow downwards by gravity and the reducing gases flow upwards in counter current, while the corresponding chemical transformations occur. Physical phenomena in the reactor could be... 

    Recovery of Rhenium From Ferromolybdenum Furnace

    , M.Sc. Thesis Sharif University of Technology Etemadi, Samaneh (Author) ; Sadrnezhaad, Khatiboleslam (Supervisor) ; Hakim, Manouchehr (Supervisor)
    In this work, the recovery of rhenium from ferromolybdenum furnace outgoing dust in semi industrial scale was conducted. The ferromolybdenum furnace outgoing dust contains rhenium as major part and large amounts of molybdenum plus Iron and copper as impurities. An overall flow sheet, consist of leaching, solvent extraction and precipitation methods, was design to recovery and purification of rhenium. Firstly, ferromolybdenum furnace outgoing dust was subjected to leaching treatment by 10 g/L sulfuric as solvent at 85 C. Secondly, solvent extraction method was employed, using LIX984N 10 %vol, to separate copper from rhenium containing solution. The results of MacCab thiele diagram for... 

    Synthesis and Experimental Study of Bimetallic Nanocatalysts for the Preferential Oxidation of CO in Hydrogen Flow

    , M.Sc. Thesis Sharif University of Technology Zare, Zahra (Author) ; Khorasheh, Farhad (Supervisor) ; Khodadadi, Abbas Ali (Supervisor) ; Mortazavi, Yadollah (Co-Advisor)
    In this investigation, silica-based iron-metal catalyst was synthesized by the Atomic layer deposited (ALD) method with iron-acetylate (Fe(acac)3) as a precursor in different loading dosages. The synthesized catalyst were characterized by nitrogen absorption and excretion (BET), by Field Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD), and Temperature-Programmed Reduction (TPR), Fourier-transform infrared spectroscopy (FTIR), Atomic Emission Spectroscopy (ICP) etc.
    The temperature range of 180 to 200 °C was determined for the self-limited chemisorption of Fe(acac)3 on the silica surface as the first and the most important step in a single atomic cycle. Also the... 

    Co-Microencapsulation of Folic Acid and Iron

    , M.Sc. Thesis Sharif University of Technology Aali, Fatemeh (Author) ; Alemzadeh, Iran (Supervisor) ; Vossough, Manouchehr (Supervisor)
    This study aimed to prepare a type of microcapsule that microencapsulates folic acid and iron at the same time and protects these two substances against environmental and gastrointestinal conditions. Simultaneous release of these two nutrients has dual health properties and improves the efficiency of folic acid microencapsulation. In this study, biocomposites were formed containing alginate, pectin, and carboxymethylcellulose, and the microcapsules were synthesized by the ionization of calcium-alginate ions. Biocomposite optimization mixture with 13 experiments using experimental design software, optimal combination design method based on repopulation separator, restoring folic acid...