بيت /shaft furnace iron ore pellet
production of DRI is carried out in the moving bed shaft furnaces using iron ore pellets as the raw material. The most common processes are the MIDREX and the ENERGIRON (previously HYL) technologies [1, 2]. The product of the DR pr ocess is a highly porous solid iron (sponge iron .
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Pellet shaft furnace is a common high temperature kiln in metallurgical industry. It is used to roast various materials, such as iron ore, iron concentrate pellets, nonferrous metal ore.
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• The dynamic swelling of iron ore pellets in a simulated blast furnace atmosphere is considerably more restrained than the corresponding static swelling. Thus, the reduction swelling behaviour of iron ore pellets should preferably be studied DYNAMICALLY under simulated blast furnace conditions to obtain the most realistic results.
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Since the low shaft furnace was experimented in the early 1950's, attempts have been made to use iron ore with coal as a composite in order to gain from the possibility of eliminating the step of high temperature agglomeration. There have been partial successes but not commercialisation of process. Iron orecoal composites can be reduced
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blast furnace process. The iron ore concentrate is now mixed and ready for the pelletizing process. Pelletizing A pellet plant contains a series of balling drums where the iron ore concentrate is formed into soft pellets, in much the same manner that one rolls a snowball, to make a pellet about the size of a marble (between 1/4" and 1/2").
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The shaft furnace can be considered as upper part of the blast furnace, working on a counter current principle. Raw materials (iron ore pellet ) charged from the top, undergoes abrasion and burden load moves downward towards discharge end through various thermal zones. Good pellet strength is necessary to withstand wear and tear during the ...
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In addition to mined iron ore, other sources of iron, such as flue dust collected from blast furnaces, or the dust produced at mine sites, is also frequently pelletized so it can be utilized, as opposed to disposed of. The Pelletizing Process. The production of iron ore pellets .
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Advantages of pelletisation Pellets are in high demand in the international markets, fetching a premium price, as they are ideal for blast furnace applications. When used in the rotary kiln, pellets reduce the iron ore requirement to tons per ton of sponge, reduce the travelling time and increase the sponge output by 2025%, reduce coal consumption by 1520% and improve the metallization ...
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DR process have developed well and vigorously in the country instead of natural gas based Shaft furnace or Retort (reduction Vs time) for iron ore pellets reduced by non Fig: Reduction (%) Vs Time for 100# size iron ore pellet Fig: Reduction (%) Vs Time
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Jul 11, 2007· A mathematical model is developed to investigate the reduction process of hematite in the reduction zone of the Midrex shaft furnace as a moving bed reactor. It is described as a countercurrent moving bed cylindrical reactor in which hematite pellets are reduced by a gaseous mixture of hydrogen ...
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Mar 29, 2018· In the present pelletizing apparatus, the induration of iron ore concentrate pellets is achieved in a tunnel furnace heated by plasma torches, wherein the generation of CO2 by the conventional iron ore pelletizing processes is reduced by using electricity powered plasma torches instead of burning natural gas, heavy oil or pulverized coal in burners, thereby reducing considerably .
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Dec 20, 2014· This shaft furnace operates on the basis of counter current principle. We must be aware about the counter current principle, where feed material of iron ore will move in downward direction inside the shaft furnace due to action of gravity and will be reduced due to movement of reducing gases in upward direction. There are some fundamental about ...
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Iron ore pellet is a kind of agglomerated fines which has better strength (expressed technically as 'tumbling index') as compared to that of parent ore and can be used as a substitute in blast furnaces in countries where lump ore is not available.
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The falling speed of iron ore pellets is m/s in DRI shaft furnace and the reduction gas quantity is 1445 Nm 3 /t with its temperature 1173 K. Fig. 2 shows the temperature change curves of reduction section at different times. It can be found that because of the gassolid heat transfer, half of the iron ore pellets are heated to 500 K
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Most of the iron in the world is produced using a blast furnace process, which has iron ore (iron oxides) and coke as its raw materials. When pellets are used in a blast furnace, the iron burden material is charged in the form of pellets and fine, ironrich byproducts are charged typically in
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Develop methods of enhancing and measuring the hightemperature softening and melting properties of iron oxide pellets reduced under simulated blast furnace smelting conditions. Add dolomite and limestone flux and a lowcost organic binder, such as starch, carboxyl methylcellose (CMC), or waste papermill sludge, to the iron oxide concentrate to produce hematite (ferric oxide) pellets with ...
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WHAT IS AN INDURATING FURNACE Indurating Furnacesare circular shaped furnaces like a Rotary Kiln and form a key part of one of the process routes for preparing iron ore fines for use in blast furnaces, and are specifically used to produce iron ore pellets. Raw or "green" pellets need to be baked to give them sufficient mechanical strength to
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Aug 21, 2015· The focus of this study is to simulate the furnace of the MIDREX technology. MIDREX technology which is the most important gasbased direct reduced iron (DRI) process in the world, includes reduction, transition and cooling zones. The reduction zone considered as a counter current gas–solid reactor produces sponge iron from iron ore pellets.
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We operate three iron ore mines located in Michigan and Minnesota produce various grades of iron ore pellets, including standard and fluxed, for use in blast furnaces. We are a minority, nonmanaging partner of Hibbing Taconite Company, also located in Minnesota.
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Fine ore injection to maintain stable packing structure in furnace shaft The latest blast furnace constitutes a massive process and is incapable of flexibly responding to changing production requirements. Table 1 Chemical compositions of pig iron, iron ores and fuels Lump ore Pellet feed Sinter T. Fe SiO 2 Al 2 O ...
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Midrex is an innovative ironmaking process, developed for the production of directreduced iron (DRI) from iron ores and primarily natural gas. Midrex is a gasbased shaft furnace process that converts iron oxides – in the form of pellets or lump ore – into direct reduced iron (DRI).
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Iron ore and DRI – An old and new conference topic EU's iron ore production and is a major supplier of DR grade ore pellets to the MENA (Middle East North Africa) region, said their deliveries in 2012 totalled of which pellets – both blast furnace and DR grade – were
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