reduction behaviour of iron ore pellets

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(2012) Dynamic and isothermal reduction swelling behaviour of olivine and acid iron ore pellets under simulated blast furnace shaft conditions. ISIJ Int 52(7): 1257–1265. II Iljana M, Mattila O, Alatarvas T, Kurikkala J, Paananen T & Fabritius T (2013) Effect of circulating elements on the dynamic reduction swelling behaviour of olivine and acid

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Reduction swelling behaviour of iron ore pellets - oulu.fi

Reduction swelling behaviour of iron ore pellets Dynamic vs. isothermal conditions Research seminar 29.5.2012, Oulu Mikko Iljana ... swelling. Thus, the reduction swelling behaviour of iron ore pellets should preferably be studied DYNAMICALLY under simulated blast furnace conditions to …

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The Effect of Lime Addition on Reduction of Iron Ore Pellets

Test Methods Employed for Determining the Metallurgical Properties of Pellets. In order to ascertain the metallurgical behavior of iron ore pellets, we carry out, amongst others, certain tests with a view to determining. the swelling of pellets, the behavior during reduction under load,

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Swelling behavior of iron ore pellet reduced by H2–CO ...

Swelling behavior of iron ore pellet reduced by H 2 ... in the present work swelling behavior of iron ore pellets in hydrogen and carbon monoxide mixtures was studied by simulating the typical gas composition in coal gasification process and Midrex process. ... Tao JiangAction rules of H 2 and CO in gas­based direct reduction of iron ore ...

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Effect of particle size on reduction behavior in iron ore ...

(CBP) comprised of iron and steelmaking by-products have been studied [24]. However, the effect of particle size on reduction behavior has been studied little. Due to the importance of iron making in the current and future technologies, the reduction of iron ore-coal composite pellets is probably one of the most studying topics.

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Direct reduced iron - Wikipedia

Direct reduced iron (DRI), also called sponge iron, is produced from the direct reduction of iron ore (in the form of lumps, pellets, or fines) to iron by a reducing gas or elemental carbon produced from natural gas or coal. Many ores are suitable for direct reduction.

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Comprehensive CFD modelling of reduction behaviour inside ...

ABSTRACT. The direct reduction process of coal-based composite pellet involves a series of physicochemical reactions. This paper reports a 3D unsteady mathematical model for simul

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Carbothermal Reduction of Iron Ore in Its Concentrate ...

Carbon-containing pellets were prepared with the carbonized product of agricultural wastes and iron concentrate, and an experimental study on the direct reduction was carried out. The experimental results demonstrated that carbon-containing pellets could be rapidly reduced at 1200 to 1300°C in 15 minutes, and the proper holding time at high temperature was 15 to 20 min.

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CHARACTERIZATION OF PROPERTIES AND REDUCTION …

an approximately identical effect on the reduction behaviour of almost all the iron ore pellets studied. As shown in Table 3, all the fired iron ore pellets showed highest degree of reduction in the first 30 minutes (i.e. up to about 40 — 50 % reduction) and thereafter the rate of reduction decreased with increasing reduction

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Iron ore - Wikipedia

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 ore is used to make steel. Indeed, it has been argued that iron ore is "more integral to the global economy than any other commodity, except perhaps oil ".

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Studies on the Reduction–Swelling Behaviors of Hematite ...

Sep 29, 2010· Studies on the reduction and swelling behaviors of fired pellets, made by mixing hematite iron ore fines of −100, −18 + 25, and −10 + 16 mesh sizes in different proportions, were carried out with low-grade coal in the temperature range of 850–1000°C with an aim to promote the massive utilization of fines in ironmaking.

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Effect of Circulating Elements on the Dynamic Reduction ...

Sulphur and alkalis in the blast furnace gas have been associated affecting the reduction swelling behaviour of iron ore pellets. A tube furnace was used in this study to examine the dynamic reduction swelling behaviour of olivine and acid pellets in CO–CO 2–N 2 atmosphere with sulphur and potassium in

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REDUCTION AND SOFTENING/MELTING BEHAVIOR OF …

Chapter 4 Reduction Behavior of Olivine-Pellets in the Experimental Blast Furnace 75 4.1 The Chemical Composition of Pellets and Location in EBF 75 4.2 Determination of the Reduction Degree of Iron Ore Pellets 78 4.3 The Reduction Degree of Probed Pellets 85 4.4 The Reduction Degree of Excavated Pellets 88

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Reduction and Swelling Behaviour of Fired Iron Ore Pellets ...

The present project work on "Reduction and Swelling Behaviour of Fired Iron Ore Pellets" was undertaken with a view to promote the effective utilization of iron ore and coal fines in sponge iron making. Presently, India has become the world leader in sponge iron production and the production of steel by DR-EAF route is increasing day by day.

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CORE

The present project work on- "Reduction Behaviour of Fired Iron Ore Pellets" was undertaken with a vision to promote the effective utilization of iron ore and coal fines in sponge iron making. Presently, India has become the world leader in sponge iron production and the production of steel by DR-EAF route is increasing day by day.

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Assessment of reduction behavior of hematite iron ore ...

@article{osti_21197807, title = {Assessment of reduction behavior of hematite iron ore pellets in coal fines for application in sponge ironmaking}, author = {Kumar, M. and Patel, S.K.}, abstractNote = {Studies on isothermal reduction kinetics (with F grade coal) in fired pellets of hematite iron ores, procured from four different mines of Orissa, were carried out in the temperature range of ...

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Reducibility and reduction swelling behaviour of some iron ...

introduction. Iron ore pellets are used for the production of hot metal in blast furnaces and DRI/HBI in direct reduction processes. A blast furnace is a shaft furnace, which is charged with iron bearing materials (pellets, sinters and/or lump ore), reducing agents (metallurgical coke) and additives (limestone, quartz, BOF slag).

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Tumbler Index - Study of Reduction Behaviour Of Iron Ore Lumps

The Tumbler Index is a relative measure of the resistance of the material to breakage or degradation by impact. (ii) Abrasion Index: It is a relative measure the degradation of iron ore by abrasion. The Tumbler Index and Aibrasion Index are determined in a tumbler test apparatus as per the Bureau of Indian Standard No. 6495

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Reduction-Swelling Behaviour of Pellets Bearing Iron Ore ...

AbstractSelf-reducing pellets containing iron ore and charcoal were reduced under argon at 1123, 1273, 1323, 1373, and 1423 K. The pellets were cold bonded with Portland cement. Pellets measuring 9.1 and 15.3mm diameter were tested. Thermogravimetry was used to follow the reduction process. X-ray diffraction was used to identify the present phases at the different steps of the reduction reaction.

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Reduction Behaviour of Iron Ore–Coal Composite Pellets in ...

Effect of various parameters like pellet shape, size, and bed packing material that are supposed to influence the heat and mass transfer in the pellet bed, have been investigated, on the reduction behaviour of iron ore–coal composite pellets at 1250 °C for 20 min in a laboratory scale RHF.

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Influence of temperature and time on reduction behavior in ...

In this study, the kinetics of reduction in iron ore–coal composite pellets has been investigated. Kinetic parameters were estimated from thermogravimetric data. X-ray diffraction was used to identify the products obtained after heating the composite pellet to different temperatures.

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REDUCTION BEHAVIOUR OF IRON ORE PELLETS - ethesis

made to study the reduction behavior and kinetics of iron ore fired pellets. The effect of different reduction parameters such as temperature (850-1000ºC), time (15-120 minutes.), mixing of particles of different sizes at different ratios for pellet preparation etc. on the reduction behavior of iron ore pellets.

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Fundamental Studies Related to Gaseous Reduction of …

of reduction behaviour of different iron ore pellets, such as rate and mechanism of reduction. Despite the extensive researches performed in this field, further investigations are needed to meet the demands of the ongoing advancements in this industry. One of the recent developments in the

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Reduction Behaviour of Olivine Iron Ore Pellets in the ...

An experimental study was conducted to determine the reduction behaviour of olivine iron ore pellets and associated reduction mechanisms in the experimental blast furnace (EBF) located at Luleå.

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UDC 622 . 785 . 5 : 669 . 162 . 26 . 012 . 4 Quality ...

perature reduction behavior of sintered ore Fig. 1 shows the relationship between the dripping temperature Td (the temperature at the time when a dripping detector detects the first dripping of iron ore from a graphite crucible) and the composi-tion of sintered ores and pellets. Here, a …

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Use of Iron Ore Pellets in Blast Furnace Burden – IspatGuru

Jun 13, 2014· BF burden, blast furnace, Hot metal, Iron ore, iron ore pellets, sinter, Use of Iron Ore Pellets in Blast Furnace Burden Pelletizing is a process that involves mixing very finely ground particles of iron ore fines of size less than 200 mesh with additives like bentonite and then shaping them into oval/spherical lumps of 8-20 mm in diameter by a ...

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Reduction Behavior of Dolomite-Fluxed Magnetite: Coke ...

The reduction was accelerated by increased amount of dolomite, while the samples with higher C/O ratio showed the improved reduction degree. X-ray diffraction (XRD) pattern of reduced pellet showed the phase changes of the iron oxides. Noticeable iron peaks were observed when the sample reached the final stage of reduction.

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Reduction Behaviour of Olivine Iron Ore Pellets in the ...

reduction behaviour of olivine iron ore pellets in the blast furnace from the shaft zone to the cohesive zone. A critical analysis and comparison of controlled laboratory and plant scale investigations is expected to lead to a clear understanding of ore reduction behaviour in the …

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Effect of Basicity on the Reduction Behavior of Iron Ore ...

Effect of Basicity on the Reduction Behavior of Iron Ore Pellets. Article · March 2018 ... The reduction of the iron ore pellets is described using a specific grain model, reflecting the ...

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Study of Reduction Behaviour Of Iron Ore Lumps - CORE

For all the fired iron ore pellets, the degree of reduction in coal was more intense in the first 30 minutes after which it became small. Slow heating led to higher degree of reduction in fired pellets than rapid heating. All the iron ores exhibited more than 90% reduction in their fired pellets in 2 hrs. time interval at a temperature of 9000C.

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