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المؤلفون: Semykina, Anna, 1986
المصدر: Metallurgical and materials transactions. B, process metallurgy and materials processing science. 43(1):56-63
مصطلحات موضوعية: Incubation periods, Kinetics of oxidation, Manganese ferrites, Mathematical relationship, Mechanism of oxidation, Oxidation process, Product layer, Temperature range, XRD, TECHNOLOGY, Materials science, TEKNIKVETENSKAP, Teknisk materialvetenskap, Chemical engineering, Metallurgical process and manufacturing engineering, Metallurgical process engineering, Kemiteknik, Metallurgisk process- och produktionsteknik, Metallurgisk processteknik
الوصف: The oxidizing kinetics of the liquid FeO-MnO-CaO-SiO(2) slags in air has been studied in the temperature range of 1500 K to 1600 K (1227 A degrees C to 1327 A degrees C) by using a thermogravimetric analysis (TGA). The reaction products after oxidation were analyzed by X-ray diffraction analysis (XRD). The surface topography of the obtained samples was analyzed by scanning electron microscopy (SEM). The products after oxidation showed the presence of manganese ferrite/magnetite and calcium silicate for all the samples in the experimental temperatures range. The oxidation process was developed through the following three consequent steps: (1) incubation period followed by a chemical reaction controlled stage (2) and later (3) diffusion of oxygen through the product layer. Appropriate mathematical relationships were constructed for these steps. Combining equations corresponding to the mechanism of oxidation, the experimental results were consistently reproduced, validating thereby the theoretical analysis.
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2
المؤلفون: Semykina, Anna, 1986, Seetharaman, Seshaddri
المصدر: Metallurgical and materials transactions. B, process metallurgy and materials processing science. 42(1):2-4
مصطلحات موضوعية: Experimental setup, Horizontal resistance, Manganese ferrites, Metallurgical slags, Nano-size, Nanoforms, Oxidizing atmosphere, Scherrer formula, Temperature range, XRD patterns, Calcium silicate, Ferrite, Furnaces, Iron oxides, Manganese, Manganese oxide, Silicates, Slags, X ray diffraction, TECHNOLOGY, Chemical engineering, Metallurgical process and manufacturing engineering, Metallurgical process engineering, TEKNIKVETENSKAP, Kemiteknik, Metallurgisk process- och produktionsteknik, Metallurgisk processteknik
الوصف: The present work investigates the formation of manganese ferrite of nanosize by oxidation of MnO- and FeO-containing slag. A horizontal resistance furnace was used as an experimental setup. The experiment was conducted in the temperature range of 1573 K to 1673 K (1300 A degrees C to 1400 A degrees C) in an oxidizing atmosphere. The samples were quenched to the cold end of the furnace and were analyzed by X-ray diffraction (XRD). The XRD patterns of the products showed the presence of two phases-manganese ferrite and calcium silicate. The particle size of the manganese ferrite was estimated by the Scherrer formula to be in the range of nanometers.
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