What does MIDREX do?
What does MIDREX do?
The MIDREX process produces direct reduced iron (hereinafter referred to as DRI). The process reduces iron ore using a reforming gas made from natural gas. The DRI is used mainly as the raw material for electric arc furnaces (EAFs), as a clean iron source substitute for scrap iron.
What is the reducing agent in MIDREX furnace?
Process flow sheet of the MIDREX process [9]. The reducing gas is produced from a mixture of natural gas (usually methane) and recycled gas from the reduction furnace. The mixture flows through catalyst tubes where it is chemically converted into a gas containing hydrogen and carbon monoxide.
What is bustle gas?
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.
What is HyL process of sponge iron making?
The HyL process is a batch process in which rich, lump iron ore is reduced in a retort by hot, reformed natural gas. The gas enters the retort in a steady flow from the top of the reactor, passes through the ore bed, and then out the bottom of the vessel.
What is SL RN process?
In the standard SL/RN process, iron ore, coal, and dolomite or limestone as desulfurizing agent are charged into a rotary kiln and heated up by a countercurrent gas flow. Reduction and coal gasification reactions take place simultaneously within the charge, creating surplus CO leaving the charge.
What is Corex process in steelmaking?
Corex is a smelting-reduction process developed by VAI, for cost-efficient and environmentally friendly production of hot metal from iron ore and low grade coal. Lump ore, sinter, pellets or a mixture are charged into a reduction shaft where they are reduced to direct-reduced iron (DRI) by a reduction gas.
What are the reducing agent used in production of DRI?
The reducing agents are carbon monoxide and hydrogen, coming from reformed natural gas, syngas or coal. Iron ore is used mostly in pellet and/or lumpy form.
What is direct reduction process?
Direct reduction refers to solid-state processes which reduce iron oxides to metallic iron at temperatures below the melting point of iron.
What is HYL process?
Energiron direct reduction process (HYL process) uses a shaft reduction furnace to produce DRI. It is designed to convert iron pellet/lump ore into metallic iron by the use of reducing gases in a solid-gas moving bed shaft furnace.
What is the rpm in coal based rotary kiln?
The kiln is inclined to 2.5 degree to the horizontal and rotated with 4.3 rpm. Bed material consists of iron ore, coal and dolomite, enters the kiln through feed end. Due to slow rotation of the kiln bed material moves towards discharge end. During this process bed material and gases do not mix.
What percent of iron ore is found in magnetite?
72.4 percent
Pure magnetite contains 72.4 percent iron, hematite 69.9 percent, limonite 59.8 percent, and siderite 48.2 percent, but, since these minerals never occur alone, the metal content of real ores is lower.
What is DRI process?
The direct reduction process uses pelletized iron ore or natural “lump” ore. The DRI method produces 97% pure iron. To eliminate fossil fuel use in iron and steel making, renewable hydrogen gas can be used in place of syngas to produce DRI.
How does the MIDREX direct reduction process work?
The MIDREX® Direct Reduction Process fueled by natural gas paired with an electric arc furnace (EAF) has the lowest CO² emissions of any commercially proven steelmaking route using virgin iron ore at 1.1 – 1.2 kg CO² / kg steel. To maximize the efficiency of reforming, offgas from the shaft furnace is recycled and blended with fresh natural gas.
Which is the heart of the MIDREX process?
COREX® THE HEART OF THE MIDREX®PROCESS IS THE MIDREX®SHAFT FURNACE. AS A KEY COMPONENT OF THE MIDREX® DIRECT REDUCTION PROCESS, THE MIDREX SHAFT FURNACE IS THE MOST FLEXIBLE AND VERSATILE REDUCTION VESSEL FOR DRI PRODUCERS. The MIDREX®Shaft Furnace can use natural gas or a syngas from coal or coke oven gas as its reductant.
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What kind of gas is used in the MIDREX process?
AS A KEY COMPONENT OF THE MIDREX® DIRECT REDUCTION PROCESS, THE MIDREX SHAFT FURNACE IS THE MOST FLEXIBLE AND VERSATILE REDUCTION VESSEL FOR DRI PRODUCERS. The MIDREX®Shaft Furnace can use natural gas or a syngas from coal or coke oven gas as its reductant.