reduction reaction in tunnel kiln process for iron ore

reduction reaction in tunnel kiln process for iron ore

(PDF) Production of Sponge Iron through Tunnel Kiln

PDF On Apr 1, 2010, Swaren Bedarkar and others published Production of Sponge Iron through Tunnel Kiln Process Find, read and cite all the research you need on ResearchGate

SPONGE IRON PRODUCTION FROM ORE -COAL

2014-9-2  In the year 1908 use of tunnel kiln started for iron oxide reduction. This process was invented by E.Sieurin as Hoganas process [3]. In 1954, more kilns came in operation in SWEDEN and USA. Presently it is more popular in China for sponge iron production from beneficiated iron ore fines cakes. In this process, the material passes through

ON THE DIRECT REDUCTION OF IRON ORE IN ROTARY KILN

2020-5-6  If << 1, as is the case for a normal rotary kiln process; the equation (1S) simplifies to and Ke is the equilibrium constant for the reduction reaction under consideration. /9ev(PCO 2-Pg0 2) ( 29) If the charge bed is composed of iron ore poticise of uniform size, at any time the fraction of total oxyger

Function and mechanism of assistant reducers in iron

Download Citation Function and mechanism of assistant reducers in iron recovery by the direct reduction in tunnel kilns of hematite Iron enrichment from refractory low-grade hematite was

THE FUNDAMENTAL ASPECTS OF IRON ORE REDUCTION

2012-1-9  pects of iron ore reduction include not only the Chemical reactions involved, their equilibria and kinetics but also the consideration of the reaction temperatures, the heat requirements, heat transfer problems and the limitations . imposed by the type of furnace 'and fuel used. In developing a new process, it is always worthwhile to critically

Experimental Study on Direct Reduction of Nb

In order to further improve utilization efficiency of Bayan obo Fe-Nb-RE complex deposit, selective reduction of Nb-bearing iron concentrate was achieved by using a reduction processes in reaction cylinder which is heated in tunnel kiln. The experiments were focused on investigating effects of reduction temperature and time on the reduction dynamics of Nb-bearing iron concentrate.

Influence of temperature and time on reduction

2014-4-1  In order to reveal the degree of reduction reaction, the ore and the product from 700 °C to 1100 °C were crushed and further analyzed.X-ray diffraction (XRD) with Cu-Kα (λ = 0.15406 nm) radiation and monochromator in the range 2θ from 10° to 100° was used to identify the formed phases.The results were shown in Fig. 1.At 25 °C the material was mainly composed of hematite (Fe

MIDREX Processes KOBELCO

2011-1-6  2. MIDREX process Fig. 3 is a flow chart for the MIDREX process. Either lump ore, or pellets prepared for direct reduction ironmaking, are charged as raw material from the top of a shaft furnace. The ore is reduced inside the furnace and the reduced iron is discharged from the bottom of the furnace. Reductant gas blown

Reaction Behavior of Iron Minerals and Metallic Iron

2013-1-23  The reaction behavior of iron minerals and growth of metallic iron particles in coal-based reduction of an oolitic iron ore were investigated by X-ray diffraction (XRD) and scanning electron microscopy/enegry dispersive spectroscoy (SEM/EDS), respectively. The results show that, the reduction of iron minerals occurred in the sequence of Fe2O3 → Fe3O4 → FeO → Fe. During the reduction, the

Carbothermic Reduction of Nickeliferous Laterite Ores

2013-9-26  The RKEF process is a two-stage pyrometallurgical process that involves the calcination and the partial reduction of the saprolite ore in a rotary kiln, followed by high-temperature smelting in an electric arc furnace.26 The final product is a ferronickel alloy containing 20 wt.% to 40 wt.% nickel. It is uneconomic to process laterite ore with

Iron Manufacturing process related to the specified

2014-1-14  Sponge iron powder . The Höganäs process is a direct reduction method for production of sponge iron powder using magnetite ore (Fe3O4) and carbon as raw materials. The reduction process takes place in a gas fired tunnel kiln at around 1200°C for 60 hours producing a sponge iron cake that is crushed, milled and

Modelling and optimization of a rotary kiln direct

2014-8-5  In the case of a generic iron-ore reduction kiln, Table I provides an overview of the parameters (and ranges) that are considered. Table I. Model inputs used in the evaluation of kiln performance Design parameters Values Kiln internal diameter 4.34 m Kiln length 80 m Kiln

Processes Free Full-Text NOx Emission Reduction by

The NOx reduction in the iron ore pelletizing process becomes an important environmental concern owing to its role in the formation of photochemical smog and acid rain. Thus, it is essential to develop new technologies for reducing NOx emissions in order to contribute to the cleaner production of pellets. In this paper, NOx reduction by advanced reburning ingrate-rotary kiln for oxidized

Direct Reduced Iron and its Production Processes

2013-3-16  Fig 2 Principle of direct reduction process. Gas based process. In the gas based reduction processes, a vertical shaft kiln is used in which iron ore is fed into the top of the kiln and finished sponge iron is drawn off from the bottom after cooling it so as

Reduction of Iron ore with Non Coking Coal

agglomerate of iron ore and coal. In the present investigations, reduction of iron ore with non-coking coal fines has been carried out. The effect of Fe 2 O 3:C ratio, time and temperature on degree of reduction under non-isothermal condition has been studied. II. EXPERIMENTAL For reduction of iron ore fines (Size -212 µ + 75 µ,having

Deposit Formation in a Grate–Kiln Plant for Iron-Ore

2019-12-12  Buildup of deposit material in chunks on refractory linings caused by combustion of various fuels is a well-known problem. This study characterizes the short-term deposits on refractory material in a grate–kiln process, carried out through in situ measurements using a water-cooled probe with a part of a refractory brick mounted in its end. Sampling was carried out during combustion of both

DRI production International Iron Metallics Association

DRI production. Direct reduction of iron is the removal of oxygen from iron ore or other iron bearing materials in the solid state, i.e. without melting, as in the blast furnace. The reducing agents are carbon monoxide and hydrogen, coming from reformed natural gas, syngas or coal. Iron ore is used mostly in pellet and/or lumpy form.

Industry Test on Phosphorus Removal and Direct

Industry test on phosphorus removal and direct reduction of the “Ningxiang type” high-phosphorus oolitic hematite ore has been carried out in a tunnel kiln on the basis of laboratory experiment. The iron grade and phosphorus content of the initial sample are 42.46% and 0.867%, respectively. The results showed that high-phosphorus oolitic hematite could be exploited on industrial scale

(PDF) i) Direct Reduced Iron: Production

2016-3-30  decades, a new route of ironmakin g has rapidly developed for direct reduction (DR) of iron ore to. metallic iron by using noncoking coal/n atural gas. This product is known as direct reduced iron

Thermodynamic analysis of the carbothermic

2016-10-12  A thermodynamic analysis of the carbothermic reduction of high-phosphorus oolitic iron ore (HPOIO) was conducted by the FactSage thermochemical software. The effects of temperature, C/O ratio, additive types, and dosages both on the reduction of fluorapatite and the formation of liquid slag were studied. The results show that the minimum thermodynamic reduction temperature of

Study on Direct Reduction of Low-Grade Iron Ore

In this work, research of reduction process was studied by means of rotary kiln (φ1.5 m × 15 m) process anatomy in order to provide fine guidance to large-scale operation. It was shown that the average reduction degree of 89.96% and metallization ratio of 85.15% were obtained at the highest temperature of 977 °C and total residence time of 90 min. The generation amount of metallic iron in

DRI Tunnel Kiln, टनल किलन in Faridabad,CASE Group

The iron ore is processed through reduction process by the use of gas that emits from natural coal gas resource. CASE Group of Industries manufactures sponge iron by using tunnel kiln, following reduction of iron ore through Static Kiln Briquetted Iron

Modelling and optimization of a rotary kiln direct

2014-8-5  In the case of a generic iron-ore reduction kiln, Table I provides an overview of the parameters (and ranges) that are considered. Table I. Model inputs used in the evaluation of kiln performance Design parameters Values Kiln internal diameter 4.34 m Kiln length 80 m Kiln

Resources Trend and Use of Direct Reduced Iron in

2015-1-27  the reduction reaction occurs at lower temperatures and at higher rates.14) These carbon composite agglomerates, however, are fragile. To compensate for the reduction in physical strength, a new process, FASTMET ® note 2), was developed; it involves a rotary hearth furnace (hereinafter "RHF") that allows the reduction reaction to occur statically.

Direct Reduced Iron and its Production Processes

2013-3-16  Fig 2 Principle of direct reduction process. Gas based process. In the gas based reduction processes, a vertical shaft kiln is used in which iron ore is fed into the top of the kiln and finished sponge iron is drawn off from the bottom after cooling it so as

(PDF) i) Direct Reduced Iron: Production

2016-3-30  decades, a new route of ironmakin g has rapidly developed for direct reduction (DR) of iron ore to. metallic iron by using noncoking coal/n atural gas. This product is known as direct reduced iron

Novel Process of Ferronickel Nugget Production from

by rotary kiln. However, this process is mostly suitable for the laterite ores with >2 mass% of Ni-grade, and the average particle size of the metal granular is only about φ1 mm.10,11) The rotary hearth furnace (RHF) has been tried to pro-duce iron nugget directly from iron ore with coal which is regarded as the new iron-making technology

System for control of sinter formation in iron oxide

A method and means for improving control of the process for directly reducing ores containing iron oxide in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the ore feed and discharge ends of the kiln, as both fuel and reductant, is disclosed wherein the temperature profile of the moving bed of solids is maintained such that the temperature is moderated to

Ring Formation in the Smelting of Saprolite Ni-ore in a

SR is also formed in the smelting process of iron ore by the rotary kiln. For example, Miyakado4) have reported that the powders occur by the rolling action of the bed, allowing the low-melting compounds of the olivine-system to be formed, which causes the SR formation in SL/RN5) direct-reduction plants (6.0 m φ×70 m L) at JFE Steel Corp

Influence of Temperature on Reaction Mechanism of

2019-5-17  The carbothermic smelting reduction process of ilmenite ore at high temperature was investigated by thermodynamic calculations in conjunction with smelting experiments. Based on thermodynamic calculations, conducting the smelting process at a higher temperature was recommended to achieve a larger amount of FeO reduction, i.e., higher Ti-enrichment, as less precipitate and thus