iron ore fluidized bed reduction method

Efficient synthesis of iron nanoparticles by self

A twostage, fluidized reduction route is proposed to synthesize iron nanoparticles NPs, with the aim of enhancing the quality of fluidization and preventing sintering activity At both low and high temperatures, the degree of metallization η is approximately 80 due to the defluidization

Direct Reduction of Iron Ore in Fluidized Beds

Direct Reduction of Iron Ore in Fluidized Beds Authors M E Kinaci, S Schneiderbauer, T Lichtenegger Publisher Elsevier Source Computer Aided Chemical Engineering Keywords CFD DEM, chemical reaction kinetics, iron ore modelling, particle shrinkage, unreacted core model Year 2018

PDF Direct Reduction of Iron Ore in Fluidized Beds

Jan 01, 2018 The iron ore is reduced to iron with the use of blast furnace and fluidized bed technologies To investigate the harsh conditions in side fluidized bed reactors, computational tools can be

Direct Iron Ore Smelting Process for Ironmaking IspatGuru

Mar 28, 2017 The DIOS process operates at a pressure of 1 kg/sq cm to2 kg/sq cm and uses top feed of coal and ore It uses a top lance for oxygen injection and has a fluidized bed system for iron ore pre reduction In the SRF, most of the reduction occurs in a foamy slag layer The calorific value of export gas is around 1000 1100 kcal/N cum

Multistep Reduction Kinetics of Fine Iron Ore with Carbon

Jan 30, 2017 Abstract The reduction kinetics of Brazilian hematite by CO is investigated in a Micro Fluidized Bed Reaction Analyzer MFBRA using an analyzing method based on Johnson Mehl Avrami JMA model at temperatures of 973 K 700 °C, 1023 K 750 °C, 1073 K 800 °C, and 1123 K 850 °C

Modeling the reduction behavior of iron ore fines in a

The reduction of iron ore fines using fluidized bed has attracted more attentions in recent years since it has more advantages in energy consumption and environment protection over the conventional process To better understand the reduction behavior of iron ore fines in a circulating fluidized bed CFB, a mathematical model based on unreacted shrinking core assumption and Rhodes

Reduction of iron ore in fluidized bed reactors Istituto

Apr 04, 1978 The present invention relates to the direct reduction of iron ore in a reducing gas in fluidized bed reactors It is known to conduct the direct reduction of iron ore in a system of fluidized beds to which the iron ore is successively fed in series, with the result that in each bed, the iron ore is progressively reduced until a desired reduction of about 95 is achieved in the final stage The

Reduction of Iron Ore in a Fluidized Bed with Hydrogen

proposed fluidized bed reduction processes Brassert and De Jahn 1951 were among the earliest to suggest the use of fluidized beds for the reduction of iron ore to metallic iron Their patent was followed by many others proposing similar concepts, mainly from Lewis 1955, Ogorzaly 19 56, Shipley 1956, Agarwal 1960, Osborn 1958

Reduction of fine iron ore via a two step fluidized bed

Mar 01, 2014 However, the fluidization behavior and reduction behavior of fine iron ore, where the reduction reaction and the carbon precipitation reaction are coupled, are scarcely studied For now, this method has not been applied in fluidized bed DR process because the control mechanism of fluidization behavior is not well understood

Efficient synthesis of iron nanoparticles by self

A twostage, fluidized reduction route is proposed to synthesize iron nanoparticles NPs, with the aim of enhancing the quality of fluidization and preventing sintering activity At both low and high temperatures, the degree of metallization η is approximately 80 due to the defluidization

Computational Fluid Dynamics Simulation of Iron Ore

Reduction in Industrial Scale Fluidized Beds Simon Schneiderbauer,* Mustafa Efe Kinaci, and Franz Hauzenberger 1 Introduction The main conversion process to gain metallic iron from oxidic iron compounds is the reduction of iron ores by suitable reduc ing agents, where iron oxides are reduced to metallic iron by gaseous reducing agents CO and

Direct and Smelting Reduction Outotec

Design, engineering, delivery, and services for SL/ RN Xtra plants, which use a combination of a pre hardening grate and traditional SL/RN kiln for the treatment of iron ore fines Hydrogen based Circored fine ore reduction plants with both circulating CFB and bubbling BFB fluidized bed reactors

Iron Ore Reduction an overview ScienceDirect Topics

The iron ore fines that enter the BF need to go through a pelletizing and sintering process In other cases, such as the smelting reduction SR processes that use the fluidized bed technologies the iron ore fines can directly be charged into the reduction process making it highly advantageous

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

US2894831A Process of fluidized bed reduction of iron

US2894831A US624861A US62486156A US2894831A US 2894831 A US2894831 A US 2894831A US 624861 A US624861 A US 624861A US 62486156 A US62486156 A US 62486156A US 2894831 A US2894831 A US 2894831A Authority US United States Prior art keywords reducing particles zone preheating furnace Prior art date 1956 11 28 Legal status The legal status is an assumption and is

A CFD DEM Model for The Simulation of Direct Reduction of

Reduction of Iron Ore in Fluidized Beds M E Kinaci a,c, , T Lic htenegger a,b , S Schneiderbauer a,c a Department for Particulate Flow Mo delling, Johannes Kepler University, Linz, Austria

Mathematical Modeling for Developing Iron Bath Reactor

The basic idea of H2 C mixture reduction reflexes using hydrogen as main reductor and carbon as main heat generator in iron bath smelt reduction reactors on purpose to cut down total energy consumption and CO2 emission The author applied the methods of modeling for separating regions and complex integration to research the kinetics behavior of the reactor

Iron Ore Reduction by Hydrogen Using a Laboratory Scale

The reduction kinetics of hematite iron ore fines to metallic iron by hydrogen using a laboratory fluidized bed reactor were investigated in a temperature range between 873 K and 1073 K, by measuring the weight change of the sample portion during reduction

US2752234A Process for continuous gaseous reduction of

230000001603 reducing Effects 0 000 title claims description 55 Process for continuous gaseous reduction of iron ore in a fluidized bed system 1955 07 07

Multistep Reduction Kinetics of Fine Iron Ore with Carbon

The reduction kinetics of Brazilian hematite by CO is investigated in a Micro Fluidized Bed Reaction Analyzer MFBRA using an analyzing method based on Johnson Mehl Avrami JMA model at temperatures of 973 K 700 °C, 1023 K 750 °C, 1073 K 800 °C, and 1123 K 850 °C The solid products at different reduction stages are evaluated by SEM/EDS and XRD technologies

Direct and Smelting Reduction Outotec

Design, engineering, delivery, and services for SL/ RN Xtra plants, which use a combination of a pre hardening grate and traditional SL/RN kiln for the treatment of iron ore fines Hydrogen based Circored fine ore reduction plants with both circulating CFB and bubbling BFB fluidized bed reactors

Modeling the reduction behavior of iron ore fines in a

The reduction of iron ore fines using fluidized bed has attracted more attentions in recent years since it has more advantages in energy consumption and environment protection over the conventional process To better understand the reduction behavior of iron ore fines in a circulating fluidized bed CFB, a mathematical model based on unreacted shrinking core assumption and Rhodes

Computational Fluid Dynamics Simulation of Iron Ore

3 3 Iron Ore Reduction in IndustrialScale Fluidized Bed FINEX The industrialscale fluidized bed consists of a nearly cylindrical vessel and four cyclones, which return the smaller entrained particles back to the fluidized bed A diplec is mounted below the cyclone to avoid a

Iron Ore Reduction by Hydrogen Using a Laboratory Scale

The reduction kinetics of hematite iron ore fines to metallic iron by hydrogen using a laboratory fluidized bed reactor were investigated in a temperature range between 873 K and 1073 K, by measuring the weight change of the sample portion during reduction

Investigation on the Kinetics of Iron Ore Fines Reduction

The scope of present work is to investigate the quasi intrinsic kinetics of the reduction of iron ore fines in a micro fluidized bed reactor Thus, two step experiment was carried out Firstly, the influence of external and internal diffusion on kinetics was significantly reduced by adjusting gas flow rate and particle size Subsequently, with the

Iron Ore Reduction by Hydrogen Using a Laboratory Scale

Jul 24, 2019 The reduction kinetics of hematite iron ore fines to metallic iron by hydrogen using a laboratory fluidized bed reactor were investigated in a temperature range between 873 K and 1073 K, by measuring the weight change of the sample portion during reduction The fluidization conditions were checked regarding plausibility within the Grace diagram and the measured pressure drop across the

THE STICKING PROBLEM DURING DIRECT REDUCTION OF

The fluidized bed is ideal for the reduction of iron ore because it enables conditions with high reduction velocity The fluidized bed reduction process of iron ores is used in Circofer, Circored, Finmet, Iron Carbide processes The fluidized bed processes are optimal for pre reduction of the iron ore

Patents Assigned to Midrex Corporation Justia Patents Search

Abstract: A fluidized bed reduction method in which powder raw material, including powder ore or partially pre reduced powder ore, forms a fluidized bed with, and is sequentially reduced by reducing gas while being moved between a plurality of fluidized bed chambers and to a fluidized bed reduction reactor which can be used in the same method The movement of the powder ore between the

ISIJ International Steel Science Portal

This fluidized bed was so designed as to form a dense bed and equip the circulating device The reduction characteristics of iron ore fines were clarified through the operation in the integrated test plant According to the above results and the simulation model based on the elutriation behavior, the appropriate residence time of coarse became

Direct reduction of Iron Ore K1 MET

Fluidized bed and moving bed reactors are one of the most important technologies in sever al branches of process industry polymer pro duction, carbon capture, direct reduction of iron ore, fluid catalytic cracking FCC, biomass reactors Especially, it is known since decades that iron

Direct reduction of Iron Ore K1 MET

Fluidized bed and moving bed reactors are one of the most important technologies in sever al branches of process industry polymer pro duction, carbon capture, direct reduction of iron ore, fluid catalytic cracking FCC, biomass reactors Especially, it is known since decades that iron

FINEX steelmaking process

FINEX is the name for an iron making technology developed by former Siemens VAI now Primetals Technologies and POSCO Molten iron is produced directly using iron ore fines and non coking coal rather than traditional blast furnace methods through sintering and reduction with coke Elimination of preliminary processing is claimed to make the plant for FINEX less expensive to build than a blast

Direct Reduction of Iron Ore in Fluidized Beds

Direct Reduction of Iron Ore in Fluidized Beds Authors M E Kinaci, S Schneiderbauer, T Lichtenegger Publisher Elsevier Source Computer Aided Chemical Engineering Keywords CFD DEM, chemical reaction kinetics, iron ore modelling, particle shrinkage, unreacted core model Year 2018

Mechanism and Prevention of Agglomeration/Defluidization

Sep 12, 2016 In the case of fluidized bed reduction of iron ore, earlier works indicated that sticking occurred mostly during metallization of ore The defluidization tended to be preferred at a high fractional reduction and metallization degree Some ore particles were precipitated by the metal iron with the fibrous shape on the particle surface

Recovery and separation of iron from iron ore using

under the action of gravity, the heated iron ore powder 450~600 °C falls into the fluidized magnetization bed Consequently, the hematite is quickly reduced to magnetite by CO After reduction roasting, the gas mixture of CO and N 2 transports the iron ore powder to the cooling unit Meanwhile, the residual CO gas

Reduction of Iron Ore in a Fluidized Bed with Hydrogen

proposed fluidized bed reduction processes Brassert and De Jahn 1951 were among the earliest to suggest the use of fluidized beds for the reduction of iron ore to metallic iron Their patent was followed by many others proposing similar concepts, mainly from Lewis 1955, Ogorzaly 19 56, Shipley 1956, Agarwal 1960, Osborn 1958

Review A Review on Prevention of Sticking during Fluidized

The fluidized bed can be combined with some smelt ing reduction furnaces such as a smelting gasifier, an iron bath furnace or an electric furnace Then the fluidized bed is used as a pre reduction setup using its good gas solid reaction conditions The main processes involved in fluid ized bed are FIOR method, FINMET method, H IRON

Fluidized bed type reduction apparatus for iron ore

Jul 28, 1998 A reduction apparatus and a method for efficient reduction of fine iron ores of wide grain range comprising serially arranged a drying/preheating furnace, a first reducing furnace for prereduction and a second reduction furnace for final reduction, each working with bubbling fluidized bed and being connected each to a cyclone for capturing iron ore dust contained in the exhaust gases, having