Kiln burning iron pellets

green pellets with non-metallurgical coals as solid reductant are presented. ROTARY KILN—SOLID REDUCTANT PROCESSES 1. Krupp Sponge Iron Process The Krupp. Sponge iron process uses a rotary kiln for the reduction of high grade lump ores or pellets (Fig. 1). The feed is introduced together with reducing and de-sulphurizing agents (lime

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The average diameter for iron ore pellets is about 12 mm and 99 % of all pellets have a diameter in the range 6.3 -16 mm and 70 % of these are, in their turn, within the interval 10-12.5 mm. Pellets can be indurated in shaft furnaces, in grate-kilns and on traveling grates. The principle of sintering pellets is almost the same in grate-kilns and

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Feb 14, 2017 The quality of these materials has direct bearing on the process as well as the product. Some plants do not use iron ore directly. These plants use iron ore pellets in the rotary kiln. Raw material mix consisting of iron ore, dolomite and non-coking coal is fed at the one end of the rotary kiln and is heated by coal burners to produce DRI

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US2750273A US365752A US36575253A US2750273A US 2750273 A US2750273 A US 2750273A US 365752 A US365752 A US 365752A US 36575253 A US36575253 A US 36575253A US 2750273 A US2750273 A US 2750273A Authority US United States Prior art keywords pellets layer burning zone fuel green Prior art date 1953-07-02 Legal status (The legal status is an assumption and is not a legal

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Pelletising. Directing heated and cooled air where it is needed and recycling heat to save energy. Whether using the straight grate process or adding a rotary kiln to make the grate-kiln process, our products are key to the process. To dry and heat the ore pellets, a number of fans are used to recycle heat from the kiln

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Jan 09, 2019 Capacities range from 7.1 metric tonne/ hour (7 long ton/hour) to 508 metric tonne/hour (500 long ton/hour). In testing the pellet plant feed materials from each of the operations, the first test series included firing of fresh plant green balls in the pot-grate and batch rotary kiln in order to avoid green ball degradation

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Iron ore pellets are a main iron-bearing burden for the blast furnace ironmaking process [1,2]. Because of its good metallurgical properties and low energy consumption in the production process, pellets can increase production, save coke, improve technical and economic indexes of ironmaking, reduce hot metal cost and improve economic benefits when applied to the blast furnace ironmaking process, as a

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The iron ore pellets produced by grate-kilns can obtain high yield, better adaptability to raw materials, uniform roasting temperature and stable product quality . In addition, the grate-kiln method can use a variety of fuels to provide heat, which is especially beneficial to countries with rich coal resources [ 3 ]

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The plant took iron ore concentrate and produced superior iron ore pellets (which are spheres of high iron content and uniform quality) for blast furnace and direct reduced iron feed. Since then, Grate-Kiln systems have been used for over 50 plants, on both magnetite and hematite ores, with an installed capacity of over 115 million tpy

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Grate Kiln process is unique process designed to evenly indurate pellets to increase its mechanical properties. This process employ a conventional ‘Straight Grate’ followed by a ‘Rotary Kiln’ designed to churn the pellets & thus increase even heating as well to avoid fragmentation in transportation

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iron pellet reduction in sponge iron kilns direct reduced iron and its production processes ispatguru, mar 16, 2013 direct reduced iron dri is technically defined as iron ore which a rotary kiln but the development of the modern direct reduction dr to 10 to 30mm or iron ore pellets produced in an iron ore pellet plant since dri is produced by

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The process principles are the basis for numerous rotary kiln plants and still represent the dominant technology for the direct reduction of lump ore or pellets using coal. Operates with the widest range of iron-bearing materials, such as pellets, lump ore, beach sand, ilmenite and

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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 industrial

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Rotary kiln is a device used to raise materials to a high temperature (calcination) in a continuous process. Materials produced using rotary kilns include: Cement, Lime, Refractories, Metakaolin,Titanium dioxide, Alumina, Vermiculite,Iron ore pellets. it is also used for roasting a wide variety of sulfide ores prior to metal extraction

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The effect of pellet chemical composition and burning temperature on pellets’ properties of the Gol-e Gohar hematite recovery plant was investigated in this study. Green pellets of different sodium hydroxide ratio and hydrated lime were prepared as well. Then the pellets were burnt in a muffle kiln under different temperature conditions

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May 01, 2011 No violent effect of reference environment temperature on exergy efficiency of major components is observed, indicating the grate is the major source of irreversibility. In a word, this study provides a better understanding of the energy and exergy flows of iron ore pellet induration in the grate–kiln and helps to economize energy

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Dec 03, 2012 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 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 industrial

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