Reduction Reaction In Tunnel Kiln Process For Iron Ores

Sep 25 2017· The production of iron ore pellets is often performed in the so-called Grate-Kiln process The aim of the process is to oxidize the magnetite Fe3O4 to hematite Fe2O3 and to sinter the pellets so they can be used in steel manufacturing The heat required for this is produced by combusting a pulverized fuel in a rotary kiln forming a suspension flame

ON THE DIRECT REDUCTION OF IRON ORE IN ROTARY KILN A K LAHIRI Department of Metallurgy Indian Institute of Science Bangalore India Abstract An analysis of direct reduction process in the isothermal zone of a rotary kiln has been made

Sep 25 2017· The production of iron ore pellets is often performed in the so-called Grate-Kiln process The aim of the process is to oxidize the magnetite Fe3O4 to hematite Fe2O3 and to sinter the pellets so they can be used in steel manufacturing The heat required for this is produced by combusting a pulverized fuel in a rotary kiln forming a suspension flame

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a tunnel kiln process direct reduction of iron ore from tunnel kiln process Dec 27 2017· DRI Tunnel Kiln CASE GROUP DRIDirect Reducted Iron Tunnel Kiln was commissioned on 24 November 2011 The process of Tunnel Kiln uses fines of Iron ore and Coal which are mixed together in The oxides of iron are reduced to iron as per the above reactions

Tunnel Kiln history dates back to 1807 when Hoganas first used this process to produce iron powder of 99 9 purity When iron ore is mined or processed in a crusher lots of fines are generated Quantity of fines generation is a function of the quality of ore i e whether it is hard or soft

for other use 4 The process of DRI or sponge Iron making can be classified into different categories as given below A Rotary Klin Process Rotary Kiln method is very important for sponge iron production using non-coking coal as a reluctant The Iron ore is charged from one end with non-coking coal which is in the lump form or pellets and

Nov 27 2014· Abstract 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

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

Tunnel Kiln Process For Sponge Iron Making - cz-eu sponge iron - tunnel kiln process of iron ore reduction low grade iron ore fines can be utilized and further processing of produced hot of rotary hearth furnace Previous Page Crusher Mobile Exporters Specifiions Next Page Idlers Rollers For Mining Manufactures

For the rotary kiln process of HIsmelt the size of the iron ore particles and the pulverized coal were controlled smaller than 6 mm and 3 mm respectively Under high temperature the decomposition of the crystal water and the reduction of iron ore could lead to the production of fine particles The presence of these fine particles provided

Price for tunnel kiln for sponge iron - riversidevetspong iron industries based on tunnel klin technology in chinaunnel kiln technology for sponge ironunnel kiln technology for sponge ironagnetic ore iron reduction process in tunnel klin tunnel kiln technology for sponge iron iron and steel making machines induction melting furnace tunnel kilns can use soft ore tunnel kilns

Feb 13 2015· Abstract In order to explore the efficacy of iron ore coal composite pellets over ordinary green pellets indurated pellets briquettes as well as standard charging of material in the form of concentric layers of iron ore and coal fines or their mixture these pellets were tested at 1 150 °C in a 7 tons per day 7 tpd pilot tunnel kiln

ON THE DIRECT REDUCTION OF IRON ORE IN ROTARY KILN A K LAHIRI Department of Metallurgy Indian Institute of Science Bangalore India Abstract An analysis of direct reduction process in the isothermal zone of a rotary kiln has been made

CASE Group success story includes commissioning DRI Tunnel Kiln first of its kind in India for use of all kind of iron ore fines The cost-effective tunnel kiln technology brings final product which has density of 4 GMS CC thus making it usable directly for melting in …

DRI is also known as sponge iron it is a solid-state direct reduction process Fig 2 6 Coal dolomite and iron ore or pellets are fed into one end of a rotary kiln while sponge iron and char are withdrawn from the other end Primary and secondary airs are supplied to the kiln to initiate combustion and reaction processes Choudhury 2014

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

Oct 12 2016· 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

Direct reduced iron tunnel kiln - zacarafarmm direct reduction of iron ore from tunnel kiln process dridirect reducted iron tunnel kiln was commissioned on 24 november 2011he process of tunnel kiln uses fines of iron ore and coal which are mixed together in the oxides of iron are reduced to iron as per the above reactions Read More

Hot direct reduced iron HDRI is DRI that is transported hot directly from the reduction furnace into an electric arc furnace thereby saving energy The direct reduction process uses pelletized iron ore or natural lump ore One exception is the fluidized bed process which requires sized iron ore particles

Oct 01 2012· Today sponge iron is created by reducing iron ore without melting it This makes for an energy-efficient feedstock for specialty steel …

Most of the plants in India use DRI process—a solid state direct reduction process by which iron ore is reduced to sponge without phase change Figure 1 Raw material mix-iron ore dolomite and coal are fed to one end of rotary Kiln and product sponge iron along with char is taken out from the other end Apart from this primary

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

Abstract In order to explore the efficacy of iron ore coal composite pellets over ordinary green pellets indurated pellets briquettes as well as standard charging of material in the form of concentric layers of iron ore and coal fines or their mixture these pellets were tested at 1 150 °C in a 7 tons per day 7 tpd pilot tunnel kiln

Tunnel Kiln history dates back to 1807 when Hoganas first used this process to produce iron powder of 99 9 purity When iron ore is mined or processed in a crusher lots of fines are generated Quantity of fines generation is a function of the quality of ore i e whether it is hard or soft

DRI is also known as sponge iron it is a solid-state direct reduction process Fig 2 6 Coal dolomite and iron ore or pellets are fed into one end of a rotary kiln while sponge iron and char are withdrawn from the other end Primary and secondary airs are supplied to the kiln to initiate combustion and reaction processes Choudhury 2014

tunnel kiln iron ore process of iron reduction in tunel kin and rotary kiln iron ore reduction in tunnel kiln solution for ore mining oct lower head grade during this year has pushed pampalo lkab malmerget underground iron ore … Contact Supplier

This turns the kiln very slowly but enough to prevent damage Internal heat exchangers Heat exchange in a rotary kiln may be by conduction convection and radiation in descending order of efficiency In low-temperature processes and in the cooler parts of long kilns lacking preheaters the kiln is often furnished with internal heat

RHF 14 15 etc The tunnel kiln features a low capacity high energy consumption and a severe production environment while the rotary kiln for the DR process is usually applied in large-scale to laterite nickel ore reduction which has negative effects on operation due to ringlet formation resulting from high temperature

Reduction of iron ore fines by coal fines in a bed fluidized by air has been studied The investigation includes study of the kinetic aspect of reduction and effect of major process …