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Reduction of dri from rotary kiln

The Dimensions of the Rotary Kiln used in Direct Reduction Plant of JSPL, DRI#II are as follows: Kiln length 82 m Internal diameter from shell to 4.8 m shell Thickness of the refractory 230 mm lining Slope or inclination of the kiln 2.5% of total length of the kiln Kiln shell thickness 25mm The Capacity of the kiln 500 tonnes of DRI /day DOI

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  • Direct Reduction Process - an overview | ScienceDirect Topics
    Direct Reduction Process - an overview | ScienceDirect Topics

    The basis of the direct reduction process is that solid sponge iron is produced by removing oxygen from the ore in a shaft furnace, rotary kiln furnace or fluidised bed. Sponge iron can be produced in the form of Direct Reduced Iron (DRI), Hot Briquetted Iron (HBI) and Cold Briquetted Iron (CBI); also Low Reduced Iron (LRI), which is pre

  • Direct Reduction of Iron Ore | SpringerLink
    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

  • WORLD DIRECT REDUCTION STATISTICS - Midrex
    WORLD DIRECT REDUCTION STATISTICS - Midrex

    productivity gains of the rotary kilns, which were able to use higher quality coal imported from South Africa and Indone-sia, according to the Sponge Iron Manufacturers Association (SIMA). Rotary kilns saw a 27.9% jump from 2018, which was already a 35% increase from 2017. Gas-based DRI plants ben

  • Direct Reduced Iron | Industrial Efficiency Technology
    Direct Reduced Iron | Industrial Efficiency Technology

    The counter-current rotary kilns used for DRI production in India only allow about 60% of the heat to be used for reduction, revalorization of the remaining 40% that is discharged from the kiln offers a significant potential for energy efficiency improvements

  • Direct Reduction Process Description
    Direct Reduction Process Description

    After reduction, the solids are discharged into a sealed rotary cooler, where water is sprayed on the cooler shell to reduce the temperature of the solids to about 200 F in a non-oxidizing atmosphere. The cooled material is then separate into DRI, DRI fines, and non-magnetics by a series of screens and magnetic separators

  • Coal gasification for DRI production – An Indian
    Coal gasification for DRI production – An Indian

    Direct reduction using coal-fired rotary kilns or natural gas-fired shaft furnaces are logical choices as production in blast furnaces is constrained by the need to import coking coal. Rotary kiln DRI capacity has been installed because it makes use of domestic iron ore and coal, but there is a limit to the growth of this technology because rotary

  • Modelling and optimization of a rotary kiln direct
    Modelling and optimization of a rotary kiln direct

    rotary kiln. This is determined by (i) the maximum flow rate of the proposed burden through a kiln, and (ii) the residence time at temperatures that would allow sufficient reduction to take place. A calculation method was developed that allows for the prediction of the bed profile and residence time in a rotary kiln

  • DRI production | International Iron Metallics Association
    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

  • OPERATIONAL ASPECTS OF SPONGE IRON
    OPERATIONAL ASPECTS OF SPONGE IRON

    Rotary Kiln Reduction Process at NML The rotary kiln at NML (Fig. 3) consists of a steel shell of 900 mm diameter and 10700 mm in length. The kiln is provided with spring load-ed stationary inlet and outlet segments with pro-. per air tight seals to prevent infiltration of air or gas leakage between the stationary heads and the rotary kiln

  • A Case Study on Accretion Formation in Rotary Kiln of DRI
    A Case Study on Accretion Formation in Rotary Kiln of DRI

    Nov 13, 2020 In coal-based DRI plants rotary kiln is used for the reduction of iron ore. Accretion rings formations inside the kiln adversely affect the performance of plant in terms of low production and inferior quality, which frequently lead to shut down. About 70% of the coal-based DRI rotatory kiln shut down is due to the accretion formation

  • Rotary Kiln Dri Process
    Rotary Kiln Dri Process

    Rotary Kiln Dri Process. kiln process.1 In this process approximately 1.5 tons of lump ore -31.53.15mm 800 kg of coal and 40 kg of dolomite are fed to a kiln to produce 1 ton of DRI. At the kiln exit the transfer of material is through a transfer chute closed off from the atmosphere through which the material falls into a rotary

  • SPONGE IRON PLANT
    SPONGE IRON PLANT

    fed to rotary kiln through feed tube in pre-determined ratio. The rotary kiln is slightly inclined at an angle 2.5 deg and rotated by ac variable speed motor at a steeples variable speed ranging form 0.2-1.0 rpm. Due to inclination and rotary motion of the kiln, the material

  • Mathematical modeling of pneumatic char injection in a
    Mathematical modeling of pneumatic char injection in a

    Oct 01, 1999 @article{osti_20001690, title = {Mathematical modeling of pneumatic char injection in a direct reduction rotary kiln}, author = {Ramakrishnan, V and Sai, P S.T.}, abstractNote = {A one-dimensional steady-state mathematical model is proposed for direct reduction process in rotary kilns akin to the SL/RN process. The model takes into account pneumatic coal char injection from the

  • Coal based Direct Reduction Rotary Kiln Process –
    Coal based Direct Reduction Rotary Kiln Process –

    Feb 14, 2017 Boudouard reaction, dolomite, DRI, Iron ore, metallization, non coking coal, pellets, reduction, Rotary kiln, Sponge iron, Sulphur, Coal based Direct Reduction Rotary Kiln Process . The coal based direct reduction rotary kiln process was developed for converting iron ore directly into metallic iron without the melting of the materials

  • (PDF) " A study on the accretion formation in DRI
    (PDF) " A study on the accretion formation in DRI

    The Dimensions of the Rotary Kiln used in Direct Reduction Plant of JSPL, DRI#II are as follows: Kiln length 82 m Internal diameter from shell to 4.8 m shell Thickness of the refractory 230 mm lining Slope or inclination of the kiln 2.5% of total length of the kiln Kiln shell thickness 25mm The Capacity of the kiln 500 tonnes of DRI /day DOI

  • A Mathematical Modelling and Simulation for Reduction in
    A Mathematical Modelling and Simulation for Reduction in

    Apr 18, 2016 Kiln-2 Air Tube-2 Duct flange on the shell (DRI-1) Kiln-8 Shell area. Kiln-8 Shell area. r slip ring (DRI-r slip ring (DRI-nea 2) 0. Fig 10: Rotary kiln and the IR image showing the surface temperature at DRI Plant. Fig 11: Variation of surface temperature and total heat flux with emissivity

  • Prospects for Coal-based Direct Reduction Process
    Prospects for Coal-based Direct Reduction Process

    rotary kilns. Pellets, or lump-ore, mixed with coal are/is charged into the rotary kilns2) and heated by coal burners to produce DRI. To avoid the significant formation of the kiln rings, their operating temperatures must be maintained in a range from 1,000 to 1,100℃3). As a result, the processes require about 12 hours of reduction time

  • Direct Reduced Iron and its Production Processes –
    Direct Reduced Iron and its Production Processes –

    Mar 16, 2013 Metallization, reformed natural gas, residual elements, Rotary kiln, Direct Reduced Iron and its Production Processes. Direct reduced iron (DRI) is the product which is produced by the direct reduction of iron ore or other iron bearing materials in the solid state by

  • Rotary Kiln Manufacturers | Electrotherm E&T
    Rotary Kiln Manufacturers | Electrotherm E&T

    Rotary Kiln with SL/RN Process. Coal Based Rotary Kiln for Direct Reduced Iron / Sponge Iron (100 TPD, 350 TPD, and 500 TPD) Solid-state reduction of Iron Ore using either coal/gas as a medium of reduction to produce a substitute raw material for steel making is termed as Direct Reduced Iron (DRI). Since DRI is produced by removing oxygen from

  • (PDF) COMPARISON OF DIFFERENT COAL BASED
    (PDF) COMPARISON OF DIFFERENT COAL BASED

    The Circofer, FASTMET, Inmetco and COMET processes seemed to be more attractive to produce DRI than the old rotary kiln processes. In the case of rotary hearth processes the reduction temperature

  • DRI UPDATE - Sponge Iron Manufacturer India
    DRI UPDATE - Sponge Iron Manufacturer India

    Reduction in SEC Performance at the end of PAT -cycle-1 Over achieved the SEC reduction target in PAT cycle-1 & awarded ESCerts 16 16 Technological Challenges: 1) Technological options for creating Oxygen Enrichment inside the DRI rotary kiln to improve utilization of Thermal Energy. 2) Technological options for recovery of heat which is being lost

  • DRI production | International Iron Metallics
    DRI production | International Iron Metallics

    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

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