Midrex

MIDREX process Midrex process Miersite Mie scattering... 

Direct Reduction. Direct reduction processes are distinguished from other ironmaking processes in that iron oxide is converted to metallic iron without melting. Because this product, called direct reduced iron (DRI), is soHd, it is most suitable for melting in an electric arc furnace (EAF) as a substitute for scrap (see Furnaces, electric). The briquetted form of DRI, hot briquetted iron (HBI) is used when the product is to be transported. Briquetting increases density and chemical stabiUty. The predominant direct reduction processes (MIDREX and HyL III) are based on natural gas as a fuel and reductant source. They are economically attractive in regions where natural gas is cheap and abundant, especially if iron ore is available nearby (see Iron BY DIRECT reduction). ... 

MIDREX Process. The primary components of a MID REX process plant include the shaft furnace, reformer, and heat recuperator. These components are supported by ancillary systems for handling iron ore, gas, water, and direct reduced iron. A flow sheet is shown in Figure 1. 

Processes of great industrial significance Allis-Chalmers, Armco, Esso Fior, HIB, HyL, Kawasaki, Kinglor-Metor, Koho, Krupp sponge iron, MIDREX, NSC, SDR, SL/RN, SPM. 

DS (2) A general name for a process for making iron or steel, which give a liquid iron product, similar to the pig iron produced in a blast furnace. Examples are SKF, KR (2), Midrex. 

FASTMET A DR process, using pulverized coal and iron ore fines, heated in a rotary hearth furnace. Under development by Midrex Corporation and Kobe Steel from 1991 apilot plant was operated by Kobe Steel in Japan in 1996. 

A variation, known as FASTMELT, conveys the hot iron powder to an adjacent melter. See also Midrex. 

HIsmelt A direct iron smelting process in which noncoking coal, fine iron ore, and fluxes and gases, are injected into a molten iron bath the carbon monoxide produced is used to prereduce the ore in a fluidized bed. Under development by CRA, Australia, since the early 1980s, joined by Midrex Corporation in 1988. Their joint venture company, Hismelt Corporation, commissioned a pilot plant at Kwinana, near Perth, Australia, in 1993. 

ITmk3 [mark 3 indicates that this is a third generation ironmaking process, marks one and two being the blast furnace and direct reduction] A modification of the Fastmet process, for making molten iron. Pelleted iron ore fines are reduced with a solid reductant. The iron in the reduced pellets separates as molten metal, uncontaminated by gangue. Developed in 1996 by Midrex Corporation and Kobe Steel. Commercialization is expected in 2003. 

SPIREX A DR process for making iron powder or hot briquetted iron from iron ore fines. Three stages are used. The first is a circulating fluidized bed preheater whose turbulent conditions reduce the particle size of the ore. The second and third stages achieve the reduction in fluidized beds, fed by reducing gases from a MIDREX reformer. Developed by Midrex Direct Reduction Corporation and Kobe Steel. A demonstration plant was scheduled to be built at the Kobe Steel plant in Venezuela in 1997. 

Middle soap phase, 22 726 Middlings, 16 603 Mid-ir lasers, 22 180 Mid-ir region, 14 234-236 MIDREX process, 14 513, 514 Midwest Research Institute, on PVC waste incineration, 25 681... 

The HiSmelt process being developed jointly by CRA of Australia and Midrex Direct Reduction Corp. uses a horizontal vessel, relying on turbulence in the bath to spray particles of slag and iron into the atmosphere above the bath, where heat is transferred from the post-combustion flame to the particles. Here, air is used instead of oxygen, thus removing the requirement of an oxygen plant. This technology emphasizes bottom injection of coal and dust into the iron bath. 

FASTMET A DR process, using pulverized coal and iron-ore fines, heated in a rotary hearth furnace. Under development by MIDREX Corporation and Kobe Steel from 1991 a pilot plant was operated by Kobe Steel in Japan in 1996. The first commercial installation was at Kobe Steel s Kakogawa plant in Japan in 2000. Further development of the process took place under the name ITmk3. A variation, known as FASTMELT, conveys the hot iron powder to an adjacent melter. See also MIDREX. 

OXY+ A process for making a reducing gas mixture by the partial oxidation of natural gas, using oxygen. Developed by Midrex Technologies, Charlotte, NC, and commercialized in 2004 for use in the MTDRF,X process. 

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