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composite pellets reduction in shaft furnace
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Sticking Behavior of Pellets During Direct Reduction …
the product of direct reduction is direct reduction iron (DRI), which provides high-quality raw materials for subsequent electric arc furnace steelmaking [1516, ]. The iron ore is typically fed as pellets into the gas-based shaft furnaces [17]. However, the sticking phenomenon between adjacent pellets
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Effects of Temperature and Atmosphere on Pellets Reduction …
After taking into account the conditions of the domestic iron resources and the non-coking coal resources, the process of coal gasification-shaft furnace is an effective way to develop direct reduction iron in China. The following tasks are very critical to choose suitable process of shaft furnace and gasification, including the production of …
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Reducing gas composition optimization for …
The kinetic analysis also shows that the reduction of iron ore-carbon composite pellets by CO or CO-CO2 mixture under non-isothermal condition should be controlled by surface reaction, and the ...
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Effect of titanium on the sticking of pellets based on …
Direct reduction based on hydrogen metallurgical gas-based shaft furnace is a promising technology for the efficient and low-carbon smelting of vanadium–titanium magnetite.
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Reduction characteristics of cold-agglomerated pellets in blast furnace
There is a significant and necessary drive towards reducing CO 2 emissions produced by iron and steelmaking industries. Binding Solutions Ltd has developed a technology to contribute to the reduction of CO 2 in the short and long term, by introducing a cold-bonded iron ore pellet to the furnace burden. Binding Solutions' cold …
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Sticking behavior of iron ore–coal pellets and its inhibition
In order to ensure permeability and smooth operation during the shaft furnace smelting process, the maximum swelling index of pellet is always required to be no more than 20% [26]. Reduction swelling and other behaviors of pellets with hydrogen-containing reducing agents have been extensively studied by many researchers [27–36].
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Direct Reduction of Iron Ore Pellets by Using CO/CO
However, the reduction of multiple layers of pellets better represents the condition in a shaft furnace. Some researchers used 30 pellets for reduction in CO-CO 2-N 2 or blast furnace gas atmospheres but the pellets were distributed in a single layer, [11, 12] which minimized the dilution of reduction gas by CO 2 developed during the …
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Review on Reduction Kinetics of Iron Ore–Coal Composite Pellet …
Abstract The use of iron ore–coal composite pellet as a raw material for iron making is an ongoing area of research. Investigations on composite pellet reduction have reported some interesting phenomena, and experimental and modeling results, in which consistent and inconsistent conclusions have been presented in the literature. The …
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Reduction Behavior of Carbon Composite Iron Ore Hot Briquette in Shaft
The reduction and melting behavior of carbon composite iron ore hot briquette in shaft furnace are discussed. As these agglomerates are made by the use of thermal plasticity of coal, the reduction ...
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A Novel Process for Direct Reduction of Titanium Concentrate Pellets …
Ilmenite is an important mineral resource containing Fe and Ti, and titanium concentrate can be obtained after beneficiation. Through the preparation of titanium concentrate oxidized pellets, gas-based shaft furnace reduction experiments, and melting and separation experiments, the phase changes during the roasting process of titanium …
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Reduction behavior of vanadium-titanium magnetite carbon composite …
Reduction behavior of carbon composite iron ore hot briquette in shaft furnace and scope on blast furnace performance reinforcement. ISIJ Int. (2003) ... Effect of Al 2 O 3 on the gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet under simulated shaft furnace atmosphere. Powder Technology, Volume 376, …
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Influence of roasting characteristics on gas-based direct reduction …
DOI: 10.1016/J.POWTEC.2017.01.062 Corpus ID: 99404872; Influence of roasting characteristics on gas-based direct reduction behavior of Hongge vanadium titanomagnetite pellet with simulated shaft furnace gases
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Direct reduction of iron ore/biomass composite pellets …
At the start-up of each test, 50 pellets of known mass were placed in the middle of the hanging cages. They were heated up to the desired temperature in the electric heating oven under N 2 atmosphere. Then, the reducing gas replaced N 2 for the whole reduction process. After 30 min, the reducing gas was switched off while the N 2 was …
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A Review on the Modeling of Gaseous Reduction of Iron Oxide Pellets
The breakthrough route involving a reduction shaft furnace operated with pure hydrogen gas (here called H 2 -SF) and the electric arc furnace is widely accepted as one of the ... Modelling the reduction of an iron ore-coal composite pellet with conduction and convection in an axisymmetric temperature field. Jingyu Shi E. Donskoi D. McElwain …
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Reduction mechanisms of pyrite cinder-carbon …
It is found that the reduction processes of the composite pellets may be divided into four stages: reduction via CO and H2 from volatiles in coal at 673-973 K, ... Compared with the rotary kiln, shaft furnace, fluidized bed, etc., the …
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Zhengjian LIU | Professor | University of Science and …
Studies have shown that the reduction of wustite is the limiting factor in the ironmaking process, whether in hydrogen-based shaft furnaces, hydrogen-rich blast furnaces or smelting reduction vessels.
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The Direct Reduction of Iron
Rotary hearth furnace: FASTMET® Composite pellets ... In the packed bed shaft furnaces, reduction occurs by reaction between the various iron oxide species present and the gas-phase acceptors of oxygen, carbon monoxide and hydrogen. As in all kinetic processes, there are several steps that operate in sequence, and the overall …
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Iron ore pellet disintegration mechanism in simulated shaft furnace
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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Detailed Modeling of the Direct Reduction of Iron Ore in a Shaft Furnace
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 into three sections ...
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Sticking behaviour and mechanism of iron ore pellets in …
However, serious sticking phenomenon often occurs in COREX shaft furnace, causing many problems to the normal operation. In this study, the loading …
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A review of ironmaking by direct reduction processes: …
Guo, D. et al. (2016) ‘Direct reduction of oxidized iron ore pellets using biomass syngas as the reducer’, Fuel Processing Technology. Elsevier B.V., 148, pp. 276â€"281. doi: 10.1016/j.fuproc.2016.03.009. [5] Guo, D. et al. (2017) ‘Direct reduction of iron ore / biomass composite pellets using simulated biomass-deriv
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Research on the reaction behavior of pellets in typical …
This study elucidated the behavior of pellets in the low-temperature reduction section during the shaft furnace smelting process, offering a technical …
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Direct Reduced Iron: Most Efficient Technologies for …
A DRI pellet rich in graphite is prone to lose that graphite as soot or dust, and this dust would be lost in three different ways: during handling of the pellets; to the electric arc furnace off-gases during addition of the pellets into the bath; and into the slag before the pellet reaches the liquid steel bath.
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Sticking Behavior of Pellets During Direct Reduction
In order to examine the sticking behavior of the pellets in the gas-based reduction shaft furnace under low H 2 /CO conditions and determine its influencing factors, the sticking behavior of ...
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Reducing process of sinter in COREX shaft furnace and …
Meanwhile, a requirement for the low-temperature reduction degradation performance of composite burden was proposed as RDI +6.3 ≥ 70% and RDI +3.15 ≥ 80% when sinter was used for COREX process ...
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Mathematical Model of the Shaft Furnace for Reduction of Iron-Ore Pellet
Synopsis: A 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 the changes of …
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Reaction model and reaction behavior of carbon composite briquette …
In the process of blast furnace smelting, adding pre-reduction burden can increase the metallization degree of burden, reduce the consumption of blast furnace reduction, and improve the reduction kinetic conditions by using the catalytic effect of metallic iron, resulting in a reduction of coke ratio and an improvement of efficiency [5–7].
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Sticking Behavior of Pellets During Direct Reduction
Sticking of pellets occurs in the direct reduction process of gas-based shaft furnace. This phenomenon has negative effects on the smooth flow of raw materials and …
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Direct reduction of pellets through hydrogen
The pellets were reduced in hydrogen atmosphere in a laboratory shaft furnace in the temperature ranges of 600–1200 °C at the pressures of 1 and 5 bar. The pellets' reduction behaviour was analysed in terms of time to reduction, rate of reduction and kinetics constant.
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Reduction of self-reducing pellets for the use in shaft …
The reduction experiments were conducted under isothermal and non-isothermal conditions by using a 3-zone tube furnace and Thermogravimetric/Differential Thermal …
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Recent Trends in the Technologies of the Direct Reduction …
The blast furnace and direct reduction processes have been the major iron production routes for various iron ores (i.e. goethite, hematite, magnetite, maghemite, siderite, etc.) in the past few decades, but the challenges of maintaining the iron and steel-making processes are enormous. The challenges, such as cumbersome production …
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Reducing gas composition optimization for COREX® pre-reduction shaft …
DOI: 10.1016/J.PROENG.2011.08.880 Corpus ID: 95556536; Reducing gas composition optimization for COREX® pre-reduction shaft furnace based on CO-H2 mixture @article{Guo2011ReducingGC, title={Reducing gas composition optimization for COREX{textregistered} pre-reduction shaft furnace based on CO-H2 mixture}, …
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Direct reduction of iron to facilitate net zero emissions in …
A computational study on the reduction behavior of iron ore/carbon composite pellets in both single and multi-layer bed rotary hearth furnace ... Sticking behaviour and mechanism of iron ore pellets in COREX pre-reduction shaft furnace. Ironmak. Steelmak. (2019) N.T. Farrokh et al. Behavior of three non-coking coals from …
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Direct reduction of iron to facilitate net zero emissions in …
Shaft furnace: Pellet ore: Natural gas/H 2: 10: 180: 0.65: 2700: Large production capacity, high product quality. Requires high-grade iron ore, high cost of reducing gas. ... explored the influence of the molar ratio of carbon to hematite on the reduction efficiency of iron ore–coal composite pellets. Reduction experiments are …
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Exploring a new path of green and efficient utilization of …
Efficient utilization of sinter return fine is an important measure to reduce cost, increase efficiency, save energy and reduce emission. A new path of green and efficient utilization of return fine was proposed to produce composite pellets. The metallurgical properties of composite pellets under the condition of hydrogen-rich blast furnace …
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Sticking Behavior of Pellets During Direct Reduction Based
Sticking of pellets occurs in the direct reduction process of gas-based shaft furnace. This phenomenon has negative effects on the smooth flow of raw materials and …