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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 corresponding typical specific consumption figures with the recycling of export gas in per ton of hot metal are around kg for dry non-coking coal, kg for additives and cum for oxygen.

Corex process was developed by the Austrian technology supplier VOEST in the late s, and its feasibility was confirmed during the s. 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.

Of these higher capacity makinf two numbers C C The gas at the temperature range of 1, deg C to 1, deg C from the melter-gasifier is cooled to the reduction gas procesa deg C to deg C by the addition of cooling gas.

Because of many peripheral requirements, the total cost of a Corex project can be relatively high. In a Corex process, the blast furnace concept is used but the blast furnace is virtually split into two halves at the cohesive zone interface Fig 3.

In a single-stage system the iron ore is both reduced and melted in the same container. Direct use of non-coking coal is possible since the coal is charred inside the melter gasifier.


The commissioning was in 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. The plant rated capacity wasmetric tons per year.

Corex Process for Production of Iron

However, nearly all of the sulphur in the non-coking coal enters the slag and hot metal. Phenols discharge is around 0. Sulphides discharge is around 0. The plant rated capacity is ranging fromtons per year totons processs year.

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It is the first and the only commercially established smelting-reduction process based on non-coking coal which is available as oron alternative route to the blast furnace for the production of hot metal. Due to its high calorific value, this gas can be recycled for reduction work or used for heat or energy generation. Use of high makinv oxygen in the Corex process generates of nitrogen free top gas.

Reducing gas for the shaft furnace is produced by partial combustion of coal with oxygen in the fluidized bed of the melter-gasifier. Injected oxygen gasifies the coal char and generates CO.

Corex Process | Industrial Efficiency Technology & Measures

Retrieved October 16, Presently, the majority of steel production is through the blast furnace which has to rely on ever decreasing amounts of coking coal. Hot DRI is mechanically transferred to the melter-gasifier where the second and third stage of the process takes place.


It takes only half an hour to stop the plant and only four hours to restart it. The process gasifies non-coking coal in a smelting reactor, which also produces liquid iron. After being reduced, the DRI is redirected to the char bed where the iron and slag are melted and then directed to the hearth zone.

Siemens claimed the COREX and FINEX processes can substantially reduce pollutant ocrex when compared to traditional steel production, with its blast furnace and coking and sintering facilities.

COREX Process | Iron Making | Iron Steel Review | Industry Guru

The pressure of Corex gas supplied to various consumers is normally around mm water column. The first stage of the process takes place in the reduction shaft, where iron ore burden is reduced by gases emanating makiing the melter-gasifier and is converted to hot DRI.

The sensible heat of the proocess gases is transferred to the crex bed, which is utilized for melting iron and slag and other metallurgical reactions. Typical analysis of hot metal from the Corex process consists of carbon — 4. Non-coking coal, limestone, and quartzite are charged by means of a lock hopper system into the freeboard above the fluidized bed area where they are heated rapidly to deg C to deg C.

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