Results 181 to 190 of about 3,128,811 (214)
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Studies in the carbothermic reduction of phosphogypsum
Metallurgical Transactions B, 1992Phosphogypsum has been reduced in the solid state by active charcoal both in the presence and absence of catalysts. Kinetic data could be fitted to the modified volume reaction model. Mixed catalysts like potassium dichromate were found to enhance the reaction rate quite satisfactorily.
Bharat B. Kale +2 more
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Vacuum Carbothermic Reduction of Alumina
Mineral Processing and Extractive Metallurgy Review, 2013The current industrial production of aluminum from alumina is based on the electrochemical Hall-Héroult process, which has the drawbacks of high-greenhouse gas emissions, reaching up to 0.70 kg CO2-equiv/kg Al, and large energy consumption, about 0.055 GJ/kg Al. An alternative process is the carbothermic reduction of alumina.
Halmann, Martin +3 more
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Kinetics of Carbothermic Reduction of Ilmenite
Materials Science Forum, 2016The reduction kinetics of ilmenite was investigated. Phase evolution during the reduction process was identified by XRD and morphology change was observed using SEM. Kinetic parameters of the activation energy and pre-exponential factor were determined by Kissinger-Akahira-Sunose (KAS) method and Coast-Redfern method&artificial isokinetic ...
Min Chen, Xuan Xiao, Xue Feng Zhang
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Nitridation of sepiolite by carbothermal reduction
Journal of Materials Science Letters, 1985tude de la preparation de ceramiques de Si 3 N 4 par nitruration de sepiolite (argile fibreuse a base de silicate de magnesium)
Yoshiyuki Sugahara +2 more
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Carbothermic reduction of domestic chromites
Metallurgical Transactions B, 1979Maximizing minerals recovery from domestic resources and minimizing the energy requirements of mineral processing constitute two goals of the Bureau of Mines, U.S. Department of the Interior. Accordingly, the Bureau has determined that coal char is generally the preferred reductant among commercially available carbonaceous materials in laboratory scale
Ralph H. Nafziger +2 more
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Carbothermic Reduction Methods for Alumina
2019The Hall–Héroult process for the electrolytic reduction of alumina was developed at the end of the 19th century and is still currently the only industrial process for the production of primary aluminum. Today, this process is ranked among the most energy- and CO2intensive industrial processes.
Efthymios Balomenos +1 more
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Fabrication of SiC by Carbothermal-Reduction Reactions of Sepiolite
Materials Science Forum, 2007The objective of this manuscript was to investigate the synthesis of SiC by carbothermal– reduction reactions of sepiolite. Sepiolite of Serbian origin and carbon (from various precursors) as a reducing agent were used. The green bodies with various C/SiO2 ratios were carbonized at 1073 K and heattreated at 1673 K in a controlled Ar flow atmosphere ...
Devečerski, Aleksandar +4 more
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Investigations on the carbothermic reduction of chromite ores
Metallurgical and Materials Transactions B, 2005Experimental studies were carried out on the reducibility of two different chromite ores using different reducing carbonaceous reducing agents in the temperature range 1173 to 1573 K. “Friable lumpy” ores and “hard lumpy” ores were used in the experiments. Petroleum coke, devolatilized coke, (DVC) and graphite were used as reducing agents. It was found
Dolly Chakraborty +2 more
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Carbothermic Reduction of Mullite at Elevated Temperature
Metallurgical and Materials Transactions B, 2013A systematic investigation was conducted on the reduction of mullite by graphite at high temperatures ranging from 1773 K to 1873 K (1500 °C to 1600 °C) in an Ar atmosphere. The reaction products were identified as Al2O3, SiC, SiO, CO, and CO2. The overall reaction rate was accelerated by increasing the temperature, whereas the atmosphere gas flow rate
Lan Hong, Veena Sahajwalla
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Equipment for microwave enhanced carbothermic reductions
2009 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2009In this paper the diversity of industrial microwave applications is highlighted by the description of another exciting field for microwave usage: the microwave carbothermic reduction of metal oxides. This is a metallurgical application for metal production, for example pig iron from hematite.
Luiz Alberto Jermolovicius +4 more
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