direct reduced iron dri also known as sponge iron offers an alternative steel production route to bf-bof and scrap-eaf routes. in dri iron ore is reduced in its solid state unlike bf process where a liquid metal is formed during reduction. dri can then be transformed to steel in electric arc furnaces.
definition of direct reduced iron dri : alternative iron source produced by heating an iron ore generally having 65 to 70 percent iron at a temperature high enough to burn off its carbon and oxygen content a process called reduction but
direct-reduced iron dri also called sponge iron is produced from direct reduction of iron ore in the form of lumps pellets or fines by a reducing gas produced from natural gas or coal. the reducing gas is a mixture majority of hydrogen h2 and carbon monoxide co which acts as reducing agent.
sponge iron or dri is obtained from the direct reduction of iron ore and has iron content between 84 to 95 percent. technically and technologically sponge iron has been found to be a suitable
it is this continual improvement that made the midrex process the world's leading technology for the direct reduction of iron ore. for more than two decades midrex plants have produced 60 percent or more of the world's dri each year and we continue to develop some of the industry's most efficient and successful technologies.
in the search for a pure available iron source steelmakers are focusing their attention on directly reduced iron dri . this material is produced by the reaction of a low gangue iron ore with a direct reduction of iron ore springerlink
the midrex process is a shaft-type direct reduction process where iron ore pellets lump iron ore or a combination are reduced in a vertical shaft reduction furnace to metallic iron by means of a reduction gas see figure 1.1.39 9 .
a direct reduced iron dri production plant is a shaft reduction furnace to produce dri with large metal iron content by directly reducing iron ore or iron ore pellets with reducing gases. while the produced dri is mainly used as the material of electric steelmaking it is also used as
direct reduction processes. there are several processes for direct reduction of iron ore: gas-based shaft furnace processes midrex and energiron being the main ones but there are several others including finmet which uses iron ore fines as feedstock - accounting for 82% of 2016 production 72.8 million tonnes ;
direct reduced iron dri is the product of the direct reduction of iron ore in the solid state by carbon monoxide and hydrogen derived from natural gas or coal. see more information about the production of dri.
sponge iron is a highly ferrous ore from the direct reduced iron process in order to prevent excessive re-oxidation of the sponge iron in the ambient air it must be cooled down in the lower region of the shaft furnace.
direct reduction dr this is any process in which iron is extracted from ore at a temperature below the melting points of the materials involved. gangue remains in the spongelike product known as direct-reduced iron or dri and must be removed in a subsequent steelmaking process. only high-grade ores and pellets made from superconcentrates 66 percent iron are therefore really suitable for dr iron making.
chapter 11. direct reduced iron dri the world market for steel is expected to continue to increase. the volume of steel produced by the now old-fashioned blast furnace process is already very low and will continue to decline relative to the volume of steel produced by the electric arc process for which dri is the material.
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.
the hisarna ironmaking process is a direct reduced iron process for iron making in which iron ore is processed almost directly into liquid iron or hot metal. the process combines two process units the cyclone converter furnace ccf for ore melting and pre-reduction and a smelting reduction vessel srv where the final reduction stage to liquid iron takes place.
the direct reduction process is a complex process which explained in simple terms consists of the following steps: material iron ore pellets: iron ore pellets the material are fed into the reactor. natural gas is converted into reducing gas: natural gas is converted into reducing
direct reduction dr is defined as any process in which metallic iron is produced by the reduction of iron ore at temperatures below the iron melting point. the product of a dr process is called direct reduced iron dri . the major consumers of dri are the smaller steel mills which use dri to dilute the residual elements present in the steel scrap.
direct reduction refers to solid-state processes which reduce iron oxides to metallic iron at temperatures below the melting point of iron. reduced iron derives its name from these processes one example being heating iron ore in a furnace at a high temperature of 800 to 1200 c in the presence of the reducing gas syngas a mixture of hydrogen and carbon monoxide .
2 direct reduction processes 2.1 midrex process. midrex is the most successful gas-based dr process; it is a continuous process. 2.2 hylsa process. hylsa is a batch process in which four reactors operate simultaneously 2.3 iron carbide process. iron carbide fe 3 c is the product of the iron