Iron ore pellet disintegration mechanism in simulated shaft …
ResultA series of reduction experiments of iron ore pellets with hydrogen, carbon monoxide and their mixture were carried out in a laboratory scale shaft …
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Analysis of Operating Conditions of Shaft Furnace for Reduction of Iron
ResultSynopsis: A mathematical model having the multi-interface model for the reduction of single pellet is employed for the theoretical analysis of the commercial operating conditions of shaft furnace and the following results are obtained. (1) The required bed height for the reduction is linear to the productivity of iron per cross sectional …
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Iron ore pellet disintegration mechanism in simulated shaft …
ResultThe disintegration behavior and mechanism of iron ore pellet in simulated shaft furnace conditions were investigated in details. Effects of …
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Computational analysis of hydrogen reduction of iron oxide pellets …
ResultThe TGR H 2-SF considered in the current work is depicted schematically in Fig. 1.The unit is essentially a countercurrent heat exchanger and chemical reactor for converting the iron oxide pellets charged at the top to DRI of high metallization degree, with the reducing agent being pure H 2.To make use of …
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Optimization of the Iron Ore Direct Reduction Process …
ResultThe shaft furnace is the core of the DR process. Iron ore pellets are charged at the top, descend due to gravity, and encounter an upward counter-flow of gas. The reducing gas (CO and H 2, plus CH 4, CO 2, and H 2 O, at about 950 °C) is injected peripherally at mid-height and exits at the top. In the lower section of the …
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Mathematical Model of the Shaft Furnace for Reduction of Iron-Ore Pellet
ResultA mathematical model of the shaft furnace is developed for gaseous reduction of iron-ore pellet. In the model, the reduction of iron-oxide is defined as the multi-stage successive reaction and the reduction rate equations are derived from the multi-interface core model in a single pellet. This model is applied to the simulation for …
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Iron ore pellet disintegration mechanism in simulated shaft furnace
ResultThe disintegration behavior and mechanism of iron ore pellet in simulated shaft furnace conditions were investigated in details. Effects of temperature, reducing gas and gangue compositions were emphatically discussed. It was found that pellet disintegrated acutely as reduced by H 2 /CO = 0.8 at 550 …
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Detailed Modeling of the Direct Reduction of Iron Ore in a Shaft Furnace
ResultAbstract and Figures. This paper addresses the modeling of the iron ore direct reduction process, a process likely to reduce CO2 emissions from the steel industry. The shaft furnace is divided ...
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Iron ore pellet disintegration mechanism in simulated shaft …
ResultSo, in the present work disintegration behavior of iron ore pellets in H 2-CO mixtures was studied by simulating the upper part of shaft furnace. And …
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Detailed Modeling of the Direct Reduction of Iron Ore in a …
ResultIn a DR shaft furnace, a charge of pelletized or lump iron ore is loaded into the top of the furnace and is allowed to descend, by gravity, through a …
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Iron Ore Pellets: North America, BF and DR Grade, …
Resultshaft furnaces: pellets, lump ore key physical properties are size consist, mechanical strength: economic importance (a) yield of pellet, lump ore converted to DRI (b) performance of the shaft reduction furnace unlike blast furnace, pellets (and lump ore) are only solid materials and so determine
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Iron ore pelletization
ResultIron ore pellets are essential burden materials to improve the performance of modern blast furnaces, because they possess high iron grade, low silica and alumina contents, excellent mechanical strength, and metallurgical performance with a uniform size distribution. ... and rotation speed of the damp …
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Iron Ore Pelletizing Process: An Overview
ResultIn 1943, E. W. Davies and co-workers demonstrated the process using an experimental shaft furnace. Commercial operation started in the 1950s in Sweden using vertical-shaft-kilns …
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Sticking behaviour and mechanism of iron ore pellets in …
ResultThe reduction temperature is 800–850°C in the COREX-3000 shaft furnace of Baosteel. Higher temperature than this will cause sticking. To study the behaviour of pellets, the exper-imental ...
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Reduction of Iron Ore Pellets, Sinter, and Lump Ore under …
ResultA blast furnace (BF) is the dominant process for making iron in the world. ... Herein, the reducibility of the iron ore pellet, sinter, and lump ore in the BF shaft are focused on. The experiments are conducted isothermally with a blast furnace simulator (BFS) high-temperature furnace at four different temperatures …
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Adapting to Raw Materials Challenges: Part 1
ResultGeneral pellet chemistry – The type and percentages of chemical elements will determine the tendency of pellets to stick and form clusters in the shaft furnace. Process upset conditions in the shaft furnace can result in significant iron unit loss to non-prime product, which may or may not be suitable for recycling through the …
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Iron Ore Pellet
ResultShaft furnaces use pellets (produced in the same way as pellets for the BF), or lump ore. Raw material for pellets is produced by crushing and grinding low-grade iron ores—typically of the taconite class and finer than 325 mesh (0.044 mm)—and magnetically separating the iron oxide (magnetite, Fe 3 O 4 ) from the siliceous …
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Reduction of Iron Ore Pellets, Sinter, and Lump Ore under …
ResultHerein, the reducibility of the iron ore pellet, sinter, and lump ore in the BF shaft are focused on. The experiments are conducted isothermally with a blast furnace simulator (BFS) high-temperature furnace at four different temperatures (700, 800, 900, and 1000 °C) for 300 min.
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Detailed Modeling of the Direct Reduction of Iron Ore in a Shaft Furnace
ResultThis paper addresses the modeling of the iron ore direct reduction process, a process likely to reduce CO2 emissions from the steel industry. The shaft furnace is divided into three sections (reduction, transition, and cooling), and the model is two-dimensional (cylindrical geometry for the upper sections and conical …
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Mathematical model of direct reduction shaft furnace and …
ResultBy using this model, the influence of the different conditions of reducing gas on the reduction of iron oxides has been examined. Further, experiments were conducted on the reduction of iron ore pellets with the use of a small shaft furnace having an inside diameter of 0.25 m and a reduction zone height of 2.7 m.
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Iron ore pelletization
ResultThe ratio for GK pellets has increased to 77.0% in 2018 from 7.0% in 2000, while the ratio for shaft furnace pellets has dropped to 14.9% in 2018 from 69.0% in 2000 in China (see Fig. 16.2). Download : Download full-size image; Fig. 16.2. Ratios of pellets produced by different pelletizing processes in China. Iron …
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Detailed Modeling of the Direct Reduction of Iron Ore in …
ResultIn a DR shaft furnace, a charge of pelletized or lump iron ore is loaded into the top of the furnace and is allowed to descend, by gravity, through a reducing gas. The …
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Sticking behaviour and mechanism of iron ore pellets in …
ResultIn this study, the loading reduction experiments of iron ore pellets were carried out under the simulating COREX reducing conditions. The influence of temperature and H 2 content in the syngas on the sticking behaviour of the pellets was observed by scanning electron microscope, energy-dispersive spectrometer …
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Direct Reduction of Iron Ore Pellets by Using CO/CO
ResultIn a shaft furnace, the reducing gases injected into the middle and the bottom part of the shaft are gradually diluted by the spent gases emitted from the reduced …
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MODELING THE IRON ORE PELLETS REDUCTION ON SHAFT FURNACE PROCESS
ResultThe process for pelletizing iron ore fines is an important operation unit for producing high quality of raw materials for the subsequent reduction processes such as blast furnace or direct reduction.
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Iron ore pellet disintegration mechanism in simulated shaft furnace
ResultDOI: 10.1016/J.POWTEC.2017.04.056 Corpus ID: 100586641; Iron ore pellet disintegration mechanism in simulated shaft furnace conditions @article{Yi2017IronOP, title={Iron ore pellet disintegration mechanism in simulated shaft furnace conditions}, author={Lingyun Yi and Huang Zhucheng …
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Analysis of impact of mechanical degradation of iron ore pellets …
ResultIron ore pellets are increasingly important in the production of sponge iron using reduction furnaces. The utilization of pellets present advantages over lump ores, increasing productivity, process stability and throughput. ... CFD simulation of two-phase gas-particle flow in the Midrex shaft furnace: the effect of …
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Hydrogen direct reduction (H-DR) in steel industry—An …
ResultThe shaft furnace direct reduction-electric arc furnace (DR-EAF) route (Fig. 1) is the primary alternative to the BF-BOF route, which reduces lump ore/pellets to direct reduced iron (DRI) primarily using natural gas (NG), and further converts the DRI in an EAF. The DR-EAF route significantly reduced the …
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Direct Reduction of Iron Ore Pellets by Using CO/CO
ResultIn a shaft furnace, the reducing gases injected into the middle and the bottom part of the shaft are gradually diluted by the spent gases emitted from the reduced pellets as it ascend upwards, which leads to a decrease in its reduction potential. ... The additives in the iron ore pellets were also found to have a strong …
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Sticking behaviour and mechanism of iron ore pellets in …
ResultCOREX is a clean process releasing lower pollution and consuming fewer cokes than the blast furnace process. However, serious sticking phenomenon often occurs in COREX shaft furnace, causing many problems to the normal operation. In this study, the loading reduction experiments of iron ore pellets …
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