fluidised bed reduction of o ides ore
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fluidised bed reduction of o ides ore

Direct Reduction of Iron-Ore in Fluidized Beds - ScienceDirect

01-01-2018  The iron-ores that are charged into the process go through fluidized bed reactors where they are heated and reduced to Direct Reduced Iron (DRI). The DRI is then charged into the melter gasifier where the final reduction and melting as well as the production of reducing gas by gasification of coal with oxygen takes place (Schenk, 2011).

US2921848A - Fluidized-bed reduction of ore - Google

Fluidized-bed reduction of ore Download PDF Info Publication number US2921848A. US2921848A US697910A US69791057A US2921848A US 2921848 A US2921848 A US 2921848A US 697910 A US697910 A US 697910A US 69791057 A US69791057 A US 69791057A US 2921848 A US2921848 A US 2921848A Authority US United States Prior art keywords gas primary reducing

Recent status of fluidized bed technologies for producing ...

01-02-2011  New ironmaking processes based on fluidized bed technology for the reduction of iron ore fines have been developed to utilize the advantage of lower raw material costs in comparison to conventional technology which uses lump ore and/or agglomerated fine ore.

(PDF) Direct Reduction of Iron-Ore in Fluidized Beds

01-11-2020  The Z-path moving fluidized bed has the advantage that it realizes a gradient utilization of heat and reduction potential of the gas in iron ore fines reduction with a comparatively simple...

Industrial fluidised bed direct reduction kinetics of ...

15-02-2011  Reduction kinetics of iron ore fines were investigated under fluidised bed conditions with hydrogen-rich gas mixtures in the temperature range from 400 to 700 °C at a pressure of 10 bar. Kinetic parameters were determined for the reactions hematite to magnetite, magnetite to wuestite and wuestite to iron from experimental data.

Recent Studies on the Application of Fluidised-Bed ...

investigated the application of fluidised-bed technology for the flotation of base metal sulphide ores (chalcopyrite and sphalerite), at grind sizes much coarser than typically carried out on a commercial scale, with the aim to reduce energy consumption by minimizing grinding costs.

Reduction of fine iron ore via a two-step fluidized bed ...

01-03-2014  The industrial application of fluidized bed direct reduction (DR) process for fine iron ore is hampered by the sticking of direct reduction iron (DRI) particles. In the present study, the carbon precipitation reaction is coupled with the reduction reaction of fine iron ore to modify the cohesive force among DRI particles.

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

Weiss et al. [21]investigated the reduction kinetics of iron ore fines under fluidised bed conditions with hydrogen-rich gas mixtures in the temperature range of 400 ~700°C, and the influence of both temperature and reducing gas

Direct-Reduced Iron - an overview ScienceDirect Topics

05-01-2012  The Circofer® process is a coal-based direct reduction process developed by Outotec GmbH. Fine ore is pre-reduced to DRI in a CFB (circulating fluidised bed) reactor (Fig. 12.14). Char and hot reducing gas are produced as by-products.

CURRENT AND POTENTIAL APPLICATIONS OF FLUID-BED TECHNOLOGY ...

idized-bed reactors, both bubbling and circulating, are being used in the direct reduction of iron ore [6–8]. The FINMET process, developed by Siemens VAI, and Circored process, developed by Lurgi, are the only industrially available and commercially operated direct reduction technologies for

Prevention of agglomeration/defluidization in fluidized ...

01-06-2013  For fluidized-bed reduction of iron ore, the sticking occurred mostly during metallization of ore and was controlled by a combination of several factors such as iron morphology, surface energy of iron, and external shape of ores , , . Some ore particles were precipitated by the metal iron with the fibrous shape on the particle surface.

SOME COMPUTATIONS REGARDING DIRECTLY REDUCTION OF

The iron ore from a silo enters the plant, being mixed up with coal; the mixture enters a preheater, then a reactor, organized as fluidised bed, where it takes place the reduction of the oxydes from ore, with C, CO, H2; in order to proceed the endothermic reactions, the heat consumption is recovered by burning gaseous fuel in the focus-tubes.

Reduction Behavior lron Ore Fines and Circulation Characteris-

the reduction characteristics of iron ore fines using a large scale fluidized bed in an integrated system. This test plant uses a bubbling fluidized bed for the pre-reduction of iron ore fines and treats the fines in the feed in a similar mannerto a circulating fluidized bed. Throughthe operation of the integrated test plant, the reduction characteristics of iron ore fines and the effect

Direct reduction process using a single fluidised bed ...

In the case of reducing metalliferous material in the form of iron ore fines, preferably the bulk temperature in the fluidised bed is in the range 850° C. to 1000° C. Preferably the bulk temperature in the fluidised bed is at least 900° C., more preferably at least 950° C.

Oxide coating mechanism during fluidized bed reduction ...

Experiments on the solid-state reaction between iron ore particles and MgO were performed to investigate the coating mechanism of MgO on the iron ore particles’ surface during fluidized bed reduction. MgO powders and iron ore particles were mixed and compressed into briquettes and, subsequently, roasted at different temperatures and for different time periods.

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

Weiss et al. [21]investigated the reduction kinetics of iron ore fines under fluidised bed conditions with hydrogen-rich gas mixtures in the temperature range of 400 ~700°C, and the influence of both temperature and reducing gas

Experimental and Morphological Investigations of the ...

For optimization of iron ore fines reduction processes, fundamental knowledge of the reduction kinetics under industrial operating conditions is required. Reduction tests with coarse hematite iron ore were performed in H 2 ‐rich reduction gas atmospheres of H 2 , H 2 O, CO, CO 2 and CH 4 considering elevated pressures similar to industrial process conditions.

Publishers: FFF, Trondheim, Norway

Mn304 (hausmannite) over 900°C. The presence of quartz in the ore restricts fluidisation temperatures to around 900°C. This is due to the formation ofmolten silicates above IOOO°C by fluxing ofthis free silica with alkaline earth and alkali oxides from the ore. The thermodynamic equilibrium condition for the fluidised bed reduction process has been

Fluidized-Bed Furnace Article about Fluidized-Bed ...

Fluidized-Bed Furnace. an industrial furnace for drying, firing, calcination, and other processes, in which the interaction between the solid granules of material and a gas stream occurs in a fluidized bed. Such furnaces have become widespread in various areas of industry in the USSR and abroad during the second half of the 20th century.

SOME COMPUTATIONS REGARDING DIRECTLY REDUCTION OF

The iron ore from a silo enters the plant, being mixed up with coal; the mixture enters a preheater, then a reactor, organized as fluidised bed, where it takes place the reduction of the oxydes from ore, with C, CO, H2; in order to proceed the endothermic reactions, the heat consumption is recovered by burning gaseous fuel in the focus-tubes.

Reduction Behavior lron Ore Fines and Circulation Characteris-

ISIJ International, Vol. 33 (1 993), No. 12, pp, 121 1-1219 Reduction Behavior ot lron Ore Fines and Circulation tics of Fines in Prereduction Fluidized Bed Characteris-Tatsuro ARIYAMA.1)Shinichi ISOZAKl.2) KOND04)and Isao KOBAYASH15) Shinji MATSUBARA.3)Hitoshi KAWATA.4)Kunihiro RDTask Force. RDCommitteefor Research and Developmenton the Newlron-Ore Smelting Reduction

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

reduction temperature, reaction time and reducing gas composition on the quality of metallic iron were discussed. Weiss et al. [21]investigated the reduction kinetics of iron ore fines under fluidised bed conditions with hydrogen-rich gas mixtures in the temperature range of 400 ~700°C, and the influence of both temperature and reducing gas

(PDF) Hydrogen as a reductant for iron ores and the ...

Fundamentals of the reduction of iron ore fines using hydrogen are studied by measurements on a laboratory fluidised bed and by mathematical modelling.

Briefing: Relevance of Iron Ore to OBMs - Metallics

cally have particle size up to 6.3 mm. Fluidised bed direct reduction processes use Iron Ore Fines as their feedstock. • Having been ground, Iron Ore oncentrates are finer than sinter feed with a particle size in the range below 2-5 mm and are used as feedstock for both sintering and pelletizing (sometimes re-grinding is required to produce ...

WO2000039351A1 - Eaf dust treatment by pelletising and ...

The invention concerns a process for the treatment of EAF (electric arc furnace) dust. In the process preheated and decontaminated EAF dust is introduced into a fluidised bed reactor in which hematite is reduced by means of a hot reducing gas generated by reforming natural gas in a non-catalytic plasma-arc heating process. This produces an iron-rich material suitable for recycling to the ...

Fluidised bed Article about Fluidised bed by The Free ...

The change of a static bed to a fluidized bed occurs when the velocity of the fluidizing agent is such that the hydrodynamic pressure of the flux P balances the force of gravity G acting on the particles. Further increase of the velocity leads first to an initial expansion of the layer, with constant hydraulic drag, and when P > G the particles begin to separate from the layer.

Fluidized Bed Article about Fluidized Bed by The Free ...

The change of a static bed to a fluidized bed occurs when the velocity of the fluidizing agent is such that the hydrodynamic pressure of the flux P balances the force of gravity G acting on the particles. Further increase of the velocity leads first to an initial expansion of the layer, with constant hydraulic drag, and when P > G the particles begin to separate from the layer.

Fluidized-Bed Furnace Article about Fluidized-Bed ...

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased. Fluidized-Bed Furnace an industrial furnace for drying, firing, calcination, and other processes, in which the interaction between the solid granules of material and a gas stream occurs in a fluidized bed. Such furnaces have become ...

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