A techno-economic approach for magnetising roasting of iron ore composite pellet using conventional and hybrid microwave furnace ... The reduction roasting was followed by multi-pass low-mid intensity magnetic separation to treat the low-grade iron ore fines (Fe 44.53%, 40.13% silica). ... shaft furnace, fluidised bed roasting, and …
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The kinetics of the isothermal reduction of iron ore–coke, iron ore–charcoal, and iron ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with the other two …
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A 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 (700, 800, 900, and 1000 …
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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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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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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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A new ironmaking concept is being proposed that involves the combination of a rotary hearth furnace (RHF) with an iron-bath smelter. The RHF makes use of iron-oxide-carbon composite pellets as the ...
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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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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 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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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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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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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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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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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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In order to ensure permeability and smooth operation in shaft furnace smelting process, the reduction behavior of oxidized pellets should be known clearly in the shaft furnace. No matter BF or gas-based shaft furnace is used, the use of oxidized pellets as a major part of the ferrous burden presents many advantages, such as high …
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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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The shaft furnace technology is applied for the reduction of pellet and lump ore, whereas fluidized bed technologies and cyclones are used for fine ore input.
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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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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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Muffle furnace reduction roasting was found to be time-consuming and energy-inefficient compared to microwave reduction roasting. Therefore, microwave …
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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 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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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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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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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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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 …
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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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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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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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