Direct reduced iron (DRI) is the product which is produced by the direct reduction of iron ore or other iron bearing materials in the solid state by using non-coking coal or natural gas. Processes which produce DRI by reduction of iron ore below the melting point of the iron are normally known as the direct reduction (DR) processes.
Midrex Process for Direct Reduction of Iron Ore Midrex is an ironmaking process, developed for the production of direct reduced iron (DRI). It is a gas-based shaft furnace process is a solid state reduction process which reduces iron ore pellets or lump ore into DRI without their melting using reducing gas generally formed from natural gas.
Jun 18, 2020· Direct reduced iron is created by heating iron ore to burn off carbon and oxygen. During the reduction process in the production of direct reduced iron, either coal or a special gas — commonly containing a combination of carbon monoxide and hydrogen — is used. This mixture functions as a reducing agent and facilitates the decrease in the ...
The major capital expenditure in a plant to make prereduced pellets is for kilns and coolers. Other items, beyond those required for conventional pellets, such as reductant bins and conveyors, add little to the depreciation charge per ton of product. Prereduced pellet plants cost more per product ton than those for oxide spheres largely because there is more iron in the metallized pellets.
It also covers a technical description of a specific type of refined iron ore. These products must be grouped under the genus of direct reduced iron (DRI BC 015 or HBI BC 016) for the purposes of the IMO Code of Safe Practice for Solid Bulk Cargoes (BC Code). This article is intended to help masters and owners understand what may or may not be ...
The reduction gases only dissolve oxygen from the iron ores. This causes the iron ores to crack on the surface. The appearance resembles a porous sponge, which is why the deoxidized and thus strongly ferrous iron ore is also called sponge iron. Sponge iron is a highly ferrous ore from the direct reduced iron .
The heart of the direct reduction is the shaft furnace, which is filled from the top with lump ore and pellets. Carbon monoxide and hydrogen are used to dissolve out the oxygen in the iron ores. In contrast to the blast furnace process, however, these reduction gases do not result from the combustion of coke.
Midrex Process for Direct Reduction of Iron Ore. Midrex is an ironmaking process, developed for the production of direct reduced iron (DRI). It is a gas-based shaft furnace process is a solid state reduction process which reduces iron ore pellets or lump ore into DRI without their melting using reducing gas generally formed from natural gas.
Direct Iron Reduction. As a part of AL ITTEFAQ STEEL PRODUCTS CO' vision- to be a leading producer of high quality steel with the lowest possible cost, -to achieve this goal, our ultra-modern Pelletization plant is underway. ... Ball Mills in the plant are fed with high-grade iron ore concentrate and high-grade iron ore fines, which are ...
During the last four decades, a new route of ironmaking has rapidly developed for direct reduction (DR) of iron ore to metallic iron by using noncoking coal/natural gas. This product is known as...
Iron Ore Reduction Iron ore consists primarily of iron oxide (Fe2O3), a combination of iron and oxygen. The basic function of all iron ore reduction technologies is to economically remove the oxygen from the iron ore and leave only the iron. Iron is the main component of steel, one of the world's most useful materials. If the
Design, engineering, delivery, and services for traditional SL/RN direct reduction plants based on a rotary kiln, with non-coking coal as the reductant and fuel. Design, engineering, delivery, and services for SL/ RN-Xtra plants, which use a combination of a pre-hardening grate and traditional SL/RN kiln for the treatment of iron ore fines.
Nov 03, 2016· The direct reduction process. HBI is the product of reducing iron ore with natural gas. This is called the direct reduction process and is an environmentally-friendly production process; a DRI plant uses natural gas which is more environmentally sound than coke. The reduction process takes place in the reduction tower.
direct reduction (DR)—electric arc furnace (EAF). Sponge iron instead of liquid hot metal is produced and then this direct reduced iron is melted in the electric furnace. 4. scrap—EAF. It is a recycling-based route contrary to the three abovementioned ore-based routes (see area of .
Direct and Smelting Reduction; AusIron process; Outotec® AusIron process. Process iron ore fines efficiently with Outotec's flexible AusIron smelting reduction process for ironmaking, a unique solution developed from Outotec's Ausmelt Top Submerged Lance (TSL) technology. The Outotec AusIron process is capable of producing hot metal from a ...
Reduction with hydrogen, in the best case produced via renewable energies, is a future‐minded alternative to commonly used fossil fuels. Direct reduction processes, which reduce iron ore to metallic iron without any liquid phase, especially have the possibility to use a high percentage of hydrogen in the reducing gas mixture.
Jun 27, 2018· Iron ore direct reduction is an attractive alternative steelmaking process in the context of greenhouse gas mitigation. To simulate the process and explore possible optimization, we developed a systemic, multiscale process model. The reduction of the iron ore pellets is described using a specific grain model, reflecting the transformations from ...
During the last four decades, a new route of ironmaking has rapidly developed for direct reduction (DR) of iron ore to metallic iron by using noncoking coal/natural gas. This product is known as ...
It is true that the H2-rich atmosphere obtained in direct reduction, processes has a much stronger reducing effect than the CO-rich atmosphere of the blast furnace. But this does not always mean that complete reduction to metallic iron is achieved faster in H2 than in CO for all iron ore materials.
All effective methods of direct reduction actually use the same process: rich iron ore (fine concentrate or pellets) is reduced by a special gas mixture up to the iron content of 85-90%. This explains why the production of direct-reduced iron is mainly concentrated in countries with large reserves of oil (oilwell gas), natural gas and iron ore ...
The DRI made from iron ore reduced by using coal as the reducing agent is not suitable for use in EAFs due to the large amount of slag and high sulfur content. As a result, the coal-based direct reduction process is utilized today mainly for steel mill dust treatment.
Reduction of iron oxides by carbon monoxide and hydrogen with the formation of CO 2 and H 2O as final products is called indirect reduction. Reduction by carbon with the formation of CO as the final product is called direct reduction. The sum of direct and indirect reduction rates equals to unity or 100%, that is,
Dec 01, 2018· Iron ore is pre-heated and fed into a reduction shaft, where it is converted to direct reduced iron (DRI) and further compacted to hot briquetted iron (HBI). Hydrogen generated in an electrolysis unit is pre-heated in a condenser before being supplied to the shaft where it .
Direct reduction of iron ore refers to the conversion of solid iron ore to metallic iron without conversion to the liquid phase [37]. Majority of the direct reduced iron (DRI) [38] is produced by reacting iron oxide with hydrocarbon-based reducing gases produced from reforming natural gas .
