قائمة الطعام
Blast furnace process is the main approach for utilizing vanadium–titanium magnetite (VTM) and VTM pellet is an important burden due to its excellent performance. In this paper, the softening–melting behavior of VTM pellets was investigated. ... Effect of Al 2 O 3 on the gas-based direct reduction behavior of Hongge vanadium titanomagnetite ...
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The straight-grate induration furnace is a non-catalytic packed bed reactor having cross current flow of gas-solid media. Different physio-chemical phenomenon …
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The operational conditions, including temperature and gas composition, vary along the radial position in a blast furnace. Nevertheless, very few studies can be found in the literature that discuss how the reduction behavior of the ferrous burden varies along the radial position. In this study, the effect of the radial charging position on the reducibility …
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OY furnace, an improvement of COREX, is the vigorously developed environmentally friendly iron-making process. However, it has a higher fuel ratio than blast furnace. The high prereduction degree (PRD) of direct reduction iron (DRI) is beneficial to decrease the fuel consumption of OY furnace but also affect the softening, melting, and …
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This study focuses on the upper BF shaft area where hematite to magnetite reduction takes place and temperature is in the range of the forward water-gas shift reaction (WGSR). ... in order to accurately control the furnace temperature in the vertical direction. The furnace element resistors are controlled by the temperature values acquired by ...
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The heat hardening or "induration" of pellets employs one of the three conventional furnace types: vertical shaft furnace, grate-kiln system, and travelling straight grate. ... the heat is gradually built up in the gases flowing downward and exchanged more vigorously with the deep layers of pellet. The magnetite oxidation, …
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The induration process using straight-grate, grate-kiln, and vertical shaft kiln systems can be divided into four different stages drying, preheating, firing, and cooling …
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The temperature in iron ore pelletizing process is as high as 1 300-1 320 degrees C, so that a significant amount of liquid slag forms in the pellets.
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The paper presents a software that allows one to simulate the traveling grate furnace, evaluating product and process characteristics. The simulation follows a deterministic, fundamental-based mathematical model of the TGF, which considers the gas network, predicts pellet properties and energy consumption and productivity ofthe process.
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Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated shaft furnace gases. Author links open overlay panel Wei Li, Nan Wang, Guiqin Fu, Mansheng Chu, Miaoyong Zhu. Show more. Add to Mendeley. ... Under the optimum roasting and magnetic separation …
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Hydrogen-direct-reduction of iron ore in a vertical shaft furnace is a potential process that could significantly reduce CO2 emissions from the steel industry. ... into magnetite and hematite ...
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Cited by: 64 Wet beneficiation of low grade iron ores, or tailings of. Magnetite ore concentrate gets reconverted into hematite ore in the pelletisation, as it is an oxidation process The hardening of pellets can be done by the vertical shaft kiln or travelling grate furnace cum rotary kiln The vertical shaft kiln needs lower investments &is suitable for …
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Grate process is an important step in grate-kiln pellet production. However, as a relatively closed system, the process on grate is inaccessible to direct detection, therefore, it is hard to control. As a result, mathematical models of temperature distribution, moisture distribution and oxidation degree distribution in pellet bed, with good …
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The heat hardening or "induration" of pellets employs one of the three conventional furnace types: vertical shaft furnace, grate-kiln system, and travelling …
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The fourth type of vertical shaft furnace to be described is the so-called "two-stove furnace with auxiliary recuperator" shown in Figure 8. Here the furnace is divided into two separate and distinct compartments, one above the other, to perform the functions of heating and cooling respectively.
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Ti(C,N) in a blast furnace.[12] Second, the quality requirements of the raw materials are reduced by the two-stage furnace, which leads to more pellets being used, effectively avoiding the problem of difficult sinter-ing for vanadium–titanium magnetite.[8–10] Similar to the blast furnace, physical and chemical changes such as
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DOI: 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 and Tao Jiang and …
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plants and new plants use the grate/kiln. Currently, natural gas is the most common fuel used for pellet induration, but heavy oil is used at a few plants, and coal and coke may …
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Pellets prepared from low-grade BHQ using conventional beneficiation and magnetization roasting.. Pellet properties are compared as a function of induration temperature. • Pellets of synthesized magnetite at 1250 °C and hematite at 1360 °C have CCS > 250 kg/pellet, porosity > 25%.. Synthesized magnetite pellet achieved 3.49% …
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A blast furnace (BF) is the dominant process for making iron in the world. ... 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 ...
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The gas based process uses a shaft furnace for the reduction reaction. The coal based process uses any one of the four types of reactors for the reduction reaction. These reactors are (i) rotary kiln, (ii) shaft furnace, (iii) fluidized bed reactor, and (iv) rotary hearth furnace. Rotary kiln is the most popular reactor for the coal based process.
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Hydrogen-direct-reduction of iron ore in a vertical shaft furnace is a potential process that could significantly reduce CO2 emissions from the steel industry. ... into magnetite and hematite ...
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Hydrogen-based shaft furnace process is gaining more and more attention due to its low carbon emission, and the reduction behavior of iron bearing burdens significantly affects its operation. In this work, the effects of reduction degree, temperature, and atmosphere on the swelling behavior of pellet has been studied thoroughly under …
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in the shaft furnace, reveals the effects of reduction gas flow rate and pellet diameter on the physical quantities in the shaft furnace. Then, establishes the hydrogen-based shaft furnace Rist operation line based on the simulation results, and optimizes the reduction gas flow rate and pellet diameter according to the calculation …
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The heat hardening or "induration" of pellets employs one of the three conventional furnace types: vertical shaft furnace, grate-kiln system, and travelling straight grate. The latter …
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This paper addresses the modeling of the iron ore direct reduction process, a process likely to reduce CO 2 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 geometry for the …
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Vanadium titano-magnetite concentrate was thoroughly mixed with a binder and water at certain ratios and pelle-tized to ϕ12–15 mm in a disc pelletizer. The pellets were then loaded into a quartz reactor after drying for 4 h in a constant-temperature drying oven. The quartz reactor was then placed into a vertical roaster. The CO–H2 gas inlet is
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The gas-based shaft furnace direct reduction process is the most competitive process for producing DRI with the advantages of pure product, environmental friendliness, low cost and compact procedure. At present, the gas-based shaft furnace direct reduction process mainly includes the Midrex process, HYL-III process and coal …
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The breakage of pellets inside the shaft furnace is often associated with the mechanical load of burden and pellet swelling, which is caused due to iron whisker or protruded iron formation.
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Meanwhile, in the process of smelting and separating the vanadium–titanium magnetite in an electric furnace, the iron-plate titanium ore is mainly present in the form of a slag phase. ... Wan XY, Wang F (2021) Smelting reduction characteristics and mechanism of vanadium-titanium magnetite carbon-bearing pellet. Trans Indian Inst …
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