Corex Process for Production of Iron. During the late twentieth century, several new initiatives have been taken for the development of the. COREX PROCESS in IRONMAKING Report Submitted by: Aditya Kumar Singh ( ), Bachelor in Technology, Metallurgy & Materials. A brief technical review about what is COREX process of iron making, some merits and demerits of COREX technology.
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The materials descend in the reduction shaft by gravity. The use of lump ore or pellets also dispenses with the need for sinter plants. Retrieved October 16, The gas at the temperature range of 1, cordx C to 1, deg C from the melter-gasifier is cooled to the reduction gas temperature deg C to deg C by the addition of cooling gas.
Corex Process for Production of Iron |
The process has three stages. Retrieved October 27, The Melter gasifier has three main sections, the gaseous free board zone, the Char bed, and the hearth zone, and it has an effect on several stages in the process.
After being reduced, the DRI is redirected to the char bed where proecss iron and slag are melted and then directed to the hearth zone. Injected oxygen gasifies the coal char and generates CO. The second makking of the process consists of melting and carburizing of hot DRI by the coal and oxygen which is added in the meter-gasifier.
The commissioning was in This being a two stage process, i. By fulfilling more stringent ecological regulations by law, utilization of low-cost, highly available low grade raw materials including fines, the COREX process has been accepted prrocess a commercially proven technology for present and future iron making process.
Of these higher capacity modules two numbers C C The high dome temperature exceeds 1, deg C which results into complete cracking of the hydrocarbons released by the non-coking coal and avoids the formation of tar. This module has a hearth diameter of 7.
Corex Process for Production of Iron
Subsequently, the hot DRI around deg C and partially calcined limestone and dolomite irkn discharged into the melter-gasifier from the reduction shaft via speed controlled discharge screw conveyors. Specific melting capacity is higher than that in Blast Furnace; productivity around 3. The gas is cleaned in a hot cyclone to recycle entrained fines. Your email address will not be published.
In this regards, organic sulphur in the coal gasifies and is absorbed by the DRI and returned to the melter-gasifier as iron sulphide. It takes only half an hour to stop the plant and only four hours to procesw it.
However, this particular problem can be mitigated by using the export proocess in electricity production. Due to continuous gas flow through the char bed, there also exists a fluidized bed in the transition area between the char bed and the free board zone.
The emission levels with the Corex process are much lower than the BF route of production which consists of blast furnace, sinter plant and the ion ovens. Corex process captures most of the pollutants in an inert state in the slag and the released hydrocarbons are destroyed in the dome of the melter-gasifier.
The process gasifies non-coking coal in a smelting reactor, which also produces liquid iron. During the late twentieth century, several new initiatives have been taken for the development of the smelting reduction technology which can become alternative route for the production of liquid iron hot metal since the conventional blast furnace BF ironmaking depends on metallurgical coal, which is required for producing BF coke needed for the production of hot metal in the blast furnace.
Also, since pure oxygen is used instead of the hot air blast, Corex process significantly reduces nitrogen emissions in the form of NOx and provides the advantages with respect to cprex emissions. Besides final reduction and melting, all other metallurgical reactions also take place in the melter-gasifier.
Corex Process – Wikipedia
First it serves to create the reduction gas by gasifying the coal with oxygen and then cooling it. Hot metal and slag are tapped as in conventional blast furnace practice. The heat and mass balance calculation for an ironmaking process plays an important role during the operation of Corex process.
Low content of hydrogen sulphide of the top gas is important with respect ifon the further usage of the Corex gas. Posted by Satyendra on Feb 22, in Coerx 0 comments.
The first stage of the process takes place in the reduction shaft, where iron ore burden is reduced by gases emanating from the melter-gasifier and is converted to hot DRI.
The outputs can be used either by integrated mills or EAF electric arc furnace mills.