fluidised bed reduction of o ides ore

fluidised bed reduction of o ides ore

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

    Therefore, a two-step fluidized bed DR process for fine iron ore is proposed, and it includes the following two steps: (1) constructing the noncohesive DRI c particles by H 2 –CO mixture at the temperature lower than 600–675 °C, where the carbon precipitation reaction is dominant, and (2) further reducing the noncohesive DRI c particles at ...

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  • Effect of Coating MgO on Sticking Behavior during ...

    Fluidized bed reduction can directly use fine ore but the coal consumption of smelting reduction process with it was more than with shaft. The main problem of fluidized bed is sticking.

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

    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 structure.

  • Factors Aftecting the Sticking of Fine Ores during ...

    Seventypes of iron ores were reduced to iron phase in a laboratory fluidized bed at 900'C by N.-H, mixtures to examinethe influence of ore type, reducing potential, andsulfur potential on sticking phenome-non and iron morphologyin the bed. In case without H.S addition, five types of ores having low AI.O, content sticked by mostly short iron

  • Fluidization state monitoring using electric current ...

    It was found that the real-time fluidization state can be monitored with the help of electric current acquisition during a fluidized bed reduction of iron ore fines, which might be used to the prediction of de-fluidization and localized fluidization state monitoring in a plant-scale fluidized bed.

  • Cited by: 2
  • roasting of ore

    Abstract A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roasted with the emission of heat and sulphur dioxide.

  • EP0196359B1 - Method and apparatus for fluidized bed ...

    fluidized bed iron ore gas reduction Prior art date 1984-09-12 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number EP85111434A Other languages German (de) French (fr) Other versions

  • Factors Affecting the Sticking of Fine Iron Ores during ...

    Seven types of iron ores were reduced to iron phase in a laboratory fluidized bed at 900°C by N 2-H 2 mixtures to examine the influence of ore type, reducing potential, and sulfur potential on sticking phenomenon and iron morphology in the bed. In case without H 2 S addition, five types of ores having low Al 2 O 3 content sticked by mostly short iron whiskers and/or porous irons, while two ...

  • US4082545A - Reduction of iron ore in fluidized bed ...

    Iron ore is introduced in a series of fluidized bed reactors, with a reducing gas that is heated before each bed and cooled after each bed and thereafter washed with water so as to remove from the gas the very fine powder of solids which otherwise would build up in the reactors. The reducing gas can be divided and fed to the reactors in parallel, the gas from all the reactors being recombined ...

  • REDUCTION OF CHROMITE FINES IN SOLID STATE USING A

    preheating the sample material to 1150oC in the quartz tube fluidized bed reactor, the carbides in the reduced ore sample were found to be 58% compared to 45% in the earlier tests according to the XRD test results. The reduced ore samples were showing a higher content of graphite (free carbon). So they were roasted in a muffle furnace at 500oC ...

  • Factors Aftecting the Sticking of Fine Ores during ...

    Seventypes of iron ores were reduced to iron phase in a laboratory fluidized bed at 900'C by N.-H, mixtures to examinethe influence of ore type, reducing potential, andsulfur potential on sticking phenome-non and iron morphologyin the bed. In case without H.S addition, five types of ores having low AI.O, content sticked by mostly short iron

  • Factors Affecting the Sticking of Fine Iron Ores during ...

    Seven types of iron ores were reduced to iron phase in a laboratory fluidized bed at 900°C by N 2-H 2 mixtures to examine the influence of ore type, reducing potential, and sulfur potential on sticking phenomenon and iron morphology in the bed. In case without H 2 S addition, five types of ores having low Al 2 O 3 content sticked by mostly short iron whiskers and/or porous irons, while two ...

  • Evolution of deposited carbon during multi-stage fluidized ...

    The influence of reduction conditions on carbon deposition during fluidized-bed pre-reduction of iron ore fines was investigated experimentally. The results showed that reduction temperature and the composition of reducing gases had a significant effect on the rate of carbon deposition and the type of carbon deposits (graphite and Fe 3 C).

  • Applications of fluidized bed technology in processes ...

    23.1. Introduction. Fluidized bed applications are widespread in the environmental, chemical and process industries. This chapter presents applications of fluidized bed technology which are gaining importance because of their ability to bring high efficiency and low emissions to various processes, their excellent heat and mass transfer characteristics, good contact between gas and solid, and a ...

  • CURRENT AND POTENTIAL APPLICATIONS OF FLUID-BED

    Current and Potential Applications of Fluid-bed Technology in the Ferroalloy Industry 125 At higher superficial gas velocities, the slip velocity begins to drop (see Figure 2), and the system enters the pneumatic transport regime. Which regime one chooses to operate a fluidized bed will determine the design of the unit.

  • Method for fluidized bed reduction of iron ore

    A method of using coal for reducing iron ore in a fluidized bed to obtain a reduced iron comprising fluidizing and pylolysis of a fine coal in a first fluidized bed, fluidized and thermal cracking the vapored material from the first fluidized bed in a second fluidized bed to deposit carbon on the surface of iron ore particles, fluidizing and reducing the iron ore in a third fluidized bed using ...

  • An Experimental Study on the Kinetics of Fluidized Bed ...

    In this work the reduction kinetics of hematite fine iron ore was studied for industrial-scale processes using the fluidized bed technology. Especially designed batch tests were performed in a laboratory-scale fluidized bed reactor fluidized with H 2 , H 2 O, CO, CO 2 , N 2 at atmospheric and elevated pressures to simulate the relevant process ...

  • EP0196359B1 - Method and apparatus for fluidized bed ...

    fluidized bed iron ore gas reduction Prior art date 1984-09-12 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number EP85111434A Other languages German (de) French (fr) Other versions

  • US4082545A - Reduction of iron ore in fluidized bed ...

    Iron ore is introduced in a series of fluidized bed reactors, with a reducing gas that is heated before each bed and cooled after each bed and thereafter washed with water so as to remove from the gas the very fine powder of solids which otherwise would build up in the reactors. The reducing gas can be divided and fed to the reactors in parallel, the gas from all the reactors being recombined ...

  • US3549352A - Staged fluidized iron ore reduction process ...

    US3549352A US668657A US3549352DA US3549352A US 3549352 A US3549352 A US 3549352A US 668657 A US668657 A US 668657A US 3549352D A US3549352D A US 3549352DA US 3549352 A US3549352 A US 3549352A Authority US United States Prior art keywords ore bogging particles iron ore iron Prior art date 1967-09-18 Legal status (The legal status is an assumption and is not a legal

  • Relation between Sulfur Pressure and Sticking of Fine Iron ...

    ONLINE ISSN: 1347-5460 PRINT ISSN: 0915-1559 (As of May 20, 2017) Registered articles: 7,281 Article; Volume/Issue/Page; DOI

  • Reduction of iron oxides by carbon in a circulating ...

    A theoretical analysis of the reduction of iron oxides by carbon in a circulating fluidized bed reactor is considered in this study. Iron oxide and coal particles are fast fluidized in the main column by a hot stream of gases (N 2–CO–CO 2–H 2–H 2O). The analysis considers kinetic

  • Experimental Study on Hydrogen Direct Reduction of ...

    For the given geometry of the test fluidized bed the reduction time of 30 minutes and temperature of 750 ℃ are considered optimal for reaching a reduction rate of over 90%. For these conditions the variation of the sample amount and flow rate result in an optimal gas consumption rate of 1500 Nm 3 /ton-ore.

  • US3475160A - Method of producing reducing gases for the ...

    Method of producing reducing gases for the fluidized bed reduction of ores Download PDF Info Publication number US3475160A. US3475160A US3475160DA US3475160A US 3475160 A US3475160 A US 3475160A US 3475160D A US3475160D A US 3475160DA US 3475160 A US3475160 A US 3475160A Authority US United States Prior art keywords carbon gas hydrogen

  • Relation between Sulfur Pressure and Sticking of Fine Iron ...

    Relation between Sulfur Pressure and Sticking of Fine Iron Ores in Fluidized Bed Reduction Shoji Hayashi 1) , Sougo Sayama 2) , Yoshiaki Iguchi 1) 1) Department of Materials Science and Engineering, Nagoya Institute of Technology 2) The Government Industrial Development Laboratory

  • Fluidised bed technology: Generating options for tomorrow ...

    Jan 09, 2012  #business #education #energy Introduction to Fluidised bed technology (an extract from Generating Options for Tomorrow 1995) Business Education Resources are...

  • 作者: Business Education
  • Sticking-Free Reduction of Titanomagnetite Ironsand in a ...

    Jun 11, 2019  Fluidized bed reduction of iron ore fines is typically inhibited by the onset of “sticking” at temperatures above 973 K, which leads to particle agglomeration and defluidization of the bed. Here, we report the sticking-free fluidized bed reduction of titanomagnetite (TTM) ironsand at 1223 K in Ar-H2 gas mixtures. We show that sticking is prevented by the formation of a protective titanium ...

  • Defluidization Conditions for a Fluidized Bed of Iron ...

    Dec 24, 2005  For combustion with CO2 capture, chemical-looping combustion with inherent separation of CO2 is a promising technology. Chemical-looping combustion uses oxygen carriers that are composed of metal oxide to transfer oxygen from the combustion air to the fuel. The defluidization of oxygen-carrier particles was investigated to improve the understanding of when particle agglomeration may occur.

  • 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. Direct reduction refers to solid-state processes which reduce iron oxides to metallic iron at temperatures below the melting ...

  • Influence of Coating Oxide and Sulfur Pressure on Sticking ...

    In order to avoid sticking during a fluidized bed reduction of iron ores and elucidate its mechanism, their reduction tests using two types of easily sticked ores coated by a water-slurry consisting of each submicron reagen of gangue species were carried out at 900°C by N 2-H 2 mixtures having sulfur activities incapable of forming FeS, where fibrous irons are known to be predominated from ...

  • Method and apparatus for reducing an iron oxide material ...

    Feb 22, 1983  A method is suggested for the reduction of finely-divided iron oxide in a fluidized bed, with the air of reducing gases formed by partial combustion in the bed of finely-divided carbonaceous material by gas containing molecular oxygen, which is supplied through nozzles (4).

  • Direct Reduction Behaviors of Titanomagnetite Ore by ...

    2.2. Experimental Procedures of Gas Reduction in the Fluidized Bed. SA TTM raw ore with main particle size 120–140 mesh (average 0.115 mm) were dried for 6 hours at 383 K for standby. Every experiment used 10 g SA TTM raw ore as reduction material. The

  • Kinetics of reduction of ferrous oxide with hydrogen in a ...

    Kinetics of reduction of ferrous oxide with hydrogen in a fluidized bed at steady state. Authors. Jerome Feinman, U.S. Steel Corporation, Monroeville, Pennsylvania; Search for more papers by this author. Thomas D. Drexler. U.S. Steel Corporation, Monroeville, Pennsylvania;

  • Direct iron ore reduction by methane in a fluidized bed ...

    @article{osti_5464224, title = {Direct iron ore reduction by methane in a fluidized bed. Final report, November 1989-December 1992}, author = {van der Vaart, D R and Conger, W L}, abstractNote = {Novel process chemistry of methane in a fluidized bed was investigated to identify a more direct route to producing the reducing gas needed in the Direct Reduction of iron ore.

  • 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 ...

  • Metallurgy - Roasters Britannica

    Metallurgy - Metallurgy - Roasters: Each of the above processes can be carried out in specialized roasters. The types most commonly in use are fluidized-bed, multiple-hearth, flash, chlorinator, rotary kiln, and sintering machine (or blast roaster). Fluidized-bed roasters (see figure) have found wide acceptance because of their high capacity and efficiency.

  • Defluidization Conditions for a Fluidized Bed of Iron ...

    Testing of minerals and industrial by-products as oxygen carriers for chemical-looping combustion in a circulating fluidized-bed 300W laboratory reactor. Fuel 2012, 93, 351-363. DOI: 10.1016/j.fuel.2011.11.009.

  • Direct Reduction of Iron Ore SpringerLink

    Nov 27, 2014  In the search for a pure, available iron source, steelmakers are focusing their attention on Directly Reduced Iron (DRI). This material is produced by the reaction of a low gangue iron ore with a hydrocarbonaceous substance. Commercially, DRI is generated in four different reactors: shaft (moving-bed), rotary kiln, fluidized bed, and retort (fixed-bed). Annual worldwide production capacity ...