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 volatile matter is driven off and shattered fixed carbon particles fall into the gasification zone where oxygen is injected through blast furnace type tuyeres to burn the carbon to carbon monoxide CO.
This module has a hearth diameter of 7.
In the process third stage which takes place in the upper part of the melter-gasifier, a fluidized bed of coal char is maintained. The attractiveness of the Corex process is due to i hot metal quality suitable for steelmaking, ii low investment and operational costs due to the elimination of coke makung and by product plant, iii low process related emission rates, iv use of a wide variety of iron ores and especially non-coking coals, and v generation of a highly valuable export gas which can be used for various purposes such as electric power generation, DRI production, or natural gas substitution.
Your email address will not be published. Out of the above mentioned reactions, reactions for the reduction of iron oxide by hydrogen and calcination are endothermic, while the reactions for the reduction of iron oxide by CO gas and carbon deposition are exothermic in nature. The naking reagents for the Corex process are iron orenoncoking coaland oxygen.
Iron ore lump ore, pellets, or a mixture thereof is charged into the reduction shaft, where it is reduced to direct reduced iron DRI by the reduction gas in counter flow. The metallization degree of the DRI and the majing of the additives are ifon dependent on four parameters namely i amount and quality of the ccorex gas, ii temperature of the reduction gas, iii reducibility of the iron bearing burden, and iv average particle size and the distribution of the solids charged.
Corex Process for Production of Iron
Meanwhile, carbon monoxide and hydrogen gas from the original gasification of the coal exit the gasifier while other byproducts are captured in the metallic slag. 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 as a commercially proven technology for present and future iron making process.
The plant rated capacity wasmetric tons per year. So, the phosphorous content of ore and coal should be as low as possible. Also, waste-water emissions from the COREX process are far lower than those in the conventional blast-furnace route. 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.
Nevertheless, it helped to overcome the critical demonstration stage for this smelting reduction technology.
The export gas generated in Corex technology can be used as a fuel gas in the downstream facilities to generate electricity or for the production of direct reduced iron in a region that mwking almost no resources of natural gas. Retrieved October 27, The heat and mass balance calculation for an ironmaking process plays an important role during the operation of Corex process. After the success of the smelting reduction technology was achieved through operation of C module, C C Because of many peripheral requirements, the total cost of a Corex project can be relatively high.
The sensible heat of the hot gases is transferred to the char bed, which makinf utilized for melting iron and slag and other metallurgical reactions.
The exothermic combustion provides the energy to complete the reduction of the hot DRI and to melt the slag and iron. Direct use of non-coking coal is possible since the coal is charred inside the melter gasifier.
Corex Process for Production of Iron |
Hot DRI is mechanically transferred to the melter-gasifier where the second and third stage of the process takes place. The schematic process flow sheet is shown vorex Fig 1 and the schematic view of main Corex plant sections is shown in Fig 2.
From Wikipedia, the free encyclopedia. The second stage of the process consists of melting and carburizing of hot DRI by the coal and oxygen which is added in the meter-gasifier. Procesw Corex technology is an acknowledged process for producing liquid hot metal proecss a quality which is identical to hot metal produced in a blast furnace.
The export fuel gas is also being known as Corex gas. This page was last edited on 10 Mayat The general applicability of this first generation process was limited and a lot of technical problems had to be solved. As far as coal is concerned, the non-coking coals having too high volatile matter VM or too low fixed carbon FC cannot be used in corex process of iron making.
Non-coking coal, limestone, and quartzite are charged by means of a lock hopper system into the freeboard above the fluidized bed procees where they are heated rapidly to deg C to deg C. After the commercial success of C module, Corex process developer started offering also higher capacity modules namely i C Makiing reduction processes come in two basic varieties, two-stage or single-stage.
Corex process was developed by the Austrian technology supplier VOEST in the late s, and its feasibility was confirmed during the s. The outputs can be used either by integrated mills or EAF electric arc furnace mills. Due to continuous gas flow through the char bed, there also exists a fluidized bed in the transition area between the char clrex and the free board zone.
During the late twentieth century, several new initiatives proocess 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.
Use of high purity oxygen in the Corex process generates of nitrogen free top gas. The first pilot plant was installed in Kehl, Germany, in