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2020-10-1 Fluidization behavior and reducibility of various iron ore grades were investigated. • A stable fluidization of hematite- and limonite-based iron ores was observed. • The magnetite-based iron ore could not be fluidized during reduction. • Trends of apparent activation energies varied as
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Carbidization Behavior of Reduced Limonite Iron Ore with CO-H 2 -H 2 S Mixtures in Fluidized Bed: Influence of Reduction Temperature and Carbidization Temperature.” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas.
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Iron ore particles of a limonite were completely reduced with H_2 at temperatures from 973 to 1273K in a laboratory scale fluidized bed. Then, at temperatures from 873 to 1073K, mainly at 973K, the reduced iron was exposed to H_2-H_2S mixtures (sulfur activity, a_S=0.5 or 0.1) for 3.6 ks and carbidized with 80%CO-H_2-H_2S mixtures at the atmospheric pressure.
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2021-1-1 Limonite acts as an in situ iron donator and seeds, allowing a low iron supersaturation in the solution during the arsenic precipitation and transformation into scorodite. Moreover, the residual arsenic concentration in the filtrate obtained from the abovementioned scorodite synthesis could be further lowered to 0.1 μg/L using fresh limonite in virtue of its high arsenic adsorbability.
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2019-1-21 Many iron-ore producing countries have been forced to assess the feasibility of using hydrated oxides and iron oxy hydroxides (goethite and limonite) as an alternative resource to obtain reduced iron. To be used economically, these minerals require a special reduction process due to their low iron content [5].
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2021-3-19 carbon monoxide produced by its combustion reduces iron oxide (hematite) in the production of the iron product. But there is a problem associated with iron and steel industry firstly: increasing in the cost of coke (coking coal) and their quality and secondly: the reduction of iron oxide with coke in blast furnace is done completely or not
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2020-12-28 11 Influence of H2O,CO2 and N2 addition on kinetics of carbidization of reduced iron in CO-H2-H2S mixtures under pressurized condition at 973K and appoach of the rate expression T.Shibata 79 12 Determination of rate control step and formularization of rate equation of carbidization from limonite in CO-H2-H2S gas mixture K.Horii 80
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The capacity of DRI (direct reduced iron) producing plants is increasing continuously to satisfy the upcoming demand on scrap substitutes as feed material in electric arc furnaces. In 1985 the annually produced DRI exceeded 10 million tons, in 1992 20 million tons and in 1999 38 mil-lion tons.1,2) One branch of processes reduces fine iron ore
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ing iron ore sintering process, which was called fuel NOx. NO was the majority of the fuel NOx, accounting for about 95%.5,6) CO and NO formed simultaneously during the solid fuel combustion process, and Hida 7–9) found that the et al. Effects of Iron Ores on the Combustion Behavior of Coke and NOx Emission during Sintering Process
Read More2020-10-1 Fluidization behavior and reducibility of various iron ore grades were investigated. • A stable fluidization of hematite- and limonite-based iron ores was observed. • The magnetite-based iron ore could not be fluidized during reduction. • Trends of apparent activation energies varied as
Read More2019-1-21 Many iron-ore producing countries have been forced to assess the feasibility of using hydrated oxides and iron oxy hydroxides (goethite and limonite) as an alternative resource to obtain reduced iron. To be used economically, these minerals require a special reduction process due to their low iron content [5].
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2018-6-1 Porous hematite ore was prepared by the dehydration of limonite ore. • The reduction experiments were conducted with H 2-N 2 mixture in a rotary drum reactor. • The effects of gas composition and temperature on reduction behavior were studied. • A dense iron layer was formed, and the thickness of which was increased during the reduction ...
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2021-3-19 behavior of iron-ore Shyamal Kumar Mondal *, Jagdish and Beenu Raj CSIR-Central Institute of Mining and Fuel Research, Dhanbad, India _____ ABSTRACT Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel. 98% of the mined iron
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Japan's largest platform for academic e-journals: J-STAGE is a full text database for reviewed academic papers published by Japanese societies
Read Moreing iron ore sintering process, which was called fuel NOx. NO was the majority of the fuel NOx, accounting for about 95%.5,6) CO and NO formed simultaneously during the solid fuel combustion process, and Hida 7–9) found that the et al. Effects of Iron Ores on the Combustion Behavior of Coke and NOx Emission during Sintering Process
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2007-9-19 Catalytic decomposition of 2000 ppm NH 3 in different atmospheres with an Australian α-FeOOH-rich limonite ore at 750–950 °C under a high space velocity of 45000 h −1 has been studied with a cylindrical quartz reactor to develop a novel hot gas cleanup method of removing NH 3 from fuel gas produced in an air-blown coal gasification process for an integrated gasification combined cycle ...
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5. SOOTING BEHAVIOR DURING THE CARBIDIZATION OF IRON OXIDES.A.N. Conejo. Journal of the Chinese Institute of Chemical Engineers,, Vol 32 (4), 2001, 311-317. Taiwan PRC. 6. A MATHEMATICAL SIMULATOR FOR THE EAF STEELMAKING
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The promotion with antimony results in some enhancement in iron carbidization, while no visible influence of tin on iron carbidization was observed. Antimony is completely reduced to the metallic state and forms iron-antimony bimetallic nanoparticles under the reaction conditions, while a significant fraction of tin oxide is present in the iron ...
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In Proc. ofISES’98 the International Symposium on Global Environment and Iron and Steel Industry, Beijing, China, 14-16 April1998: pp. 331-335. Xu, C., D. Cang, Study on comprehensive model for diffusion of air pollutants in South China”, In Proc. of the 4thNational Conference onEnvironmental Protection for Young Scientists , China Environmental Science Press, Beijing,1996: pp. 670-674.
Read More2021-3-19 behavior of iron-ore Shyamal Kumar Mondal *, Jagdish and Beenu Raj CSIR-Central Institute of Mining and Fuel Research, Dhanbad, India _____ ABSTRACT Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel. 98% of the mined iron
Read More2007-9-19 Catalytic decomposition of 2000 ppm NH 3 in different atmospheres with an Australian α-FeOOH-rich limonite ore at 750–950 °C under a high space velocity of 45000 h −1 has been studied with a cylindrical quartz reactor to develop a novel hot gas cleanup method of removing NH 3 from fuel gas produced in an air-blown coal gasification process for an integrated gasification combined cycle ...
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2015-9-18 Characterization of reduced goethite. XRD patterns of reduced limonite and commercial iron powder are presented in Fig. 1.It displayed that only Fe 0 was detected for the commercial iron powder. Besides, only magnetite was detected as compared with the standard (ICSD 96-900-2319) when the annealing temperature reached to 300 °C.
Read More2020-12-28 11 Influence of H2O,CO2 and N2 addition on kinetics of carbidization of reduced iron in CO-H2-H2S mixtures under pressurized condition at 973K and appoach of the rate expression T.Shibata 79 12 Determination of rate control step and formularization of rate equation of carbidization from limonite in CO-H2-H2S gas mixture K.Horii 80
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[文献書誌] Y. IGUCHI, K. Matsubara, S. Hayashi: "Carburization Behavior of Reduced Limonite Iron Ore with CO-H2-H2S Mixtures in Fluidized Bed : Influence of Reduction Temperature and Carbidi2ation Temperature"Tetsu-to-Hagan. vol. 87. 396-402 (2001)
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Limonite is also known to have good reducibility due to high porosity. It consists of hydrated iron oxides. Mali and Spuida 42 defined an order of reducibility for different types of iron ore. In it, limonite shows the best reducibility followed by hematite and magnetite. The criteria for ordering include the specific surface area of the iron ores.
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2019-7-15 Now, although we have not identified these two peaks at around 50 to 55 deg, it is suggested that the two peaks occur due to gangue component, because these peaks appeared after reduction progress of iron oxide in IL. In addition, these peaks have not been observed in other reduced-limonite sample prepared by H 2 or carbon reduction.[23,24]
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2016-8-22 Abstract：The effects of dosage of reducing agent, reduction temperature and time on direct reduction of limonite with iron-rich coal slime were studied by comparison with anthracite. The phase and morphologies of limonite ore and its coal slime pellets at different reducing temperature were investigated by using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
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In Proc. ofISES’98 the International Symposium on Global Environment and Iron and Steel Industry, Beijing, China, 14-16 April1998: pp. 331-335. Xu, C., D. Cang, Study on comprehensive model for diffusion of air pollutants in South China”, In Proc. of the 4thNational Conference onEnvironmental Protection for Young Scientists , China Environmental Science Press, Beijing,1996: pp. 670-674.
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