(PDF) Modeling of Rotary Kiln for Sponge Iron Processing . Schematic of optimised Rotary kiln sponge iron making process Iron Ore and Non Coking Coal along with Dolomite are fed continuously to the charge end of Rotary Kiln which is inclined at 25% of drum length Coal is also injected through a Coal Throw Pipe at the discharge end of Kiln Due to the inclination and rotation of Kiln the charge
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This study focuses on sponge iron kiln based process. The chemical process involved in making sponge iron removes oxygen from iron ore by using a reducing agent in the form of non-coking coal [Patra et al, (2005)]. The reduction process is carried out in an inclined horizontal rotary kiln, which rotates at a programmed speed
Sponge Iron, also known as Direct Reduced Iron is produced from Hematite Iron ore (5 to 18 mm size) by removing the oxygen by direct reduction process using non coking coal as the fuel and reducing agent in Rotary Kiln. Sponge iron is rich in Metallic Iron (Pure Iron) with
Sep 10, 2020 In the newly designed sponge iron rotary kiln system, a coarse coal branch pipe and fine coal branch pipe are added at the kiln head. The original way of adding 100% coal at the kiln head is changed to 50-70% coal is added together with fine iron ore and dolomite through the mixing mode at the kiln tail, and the remaining 30-50% coal is added
Jul 14, 2014 Most of the plants in India use DRI process—a solid state direct reduction process by which iron ore is reduced to sponge without phase change (Figure 1). Raw material mix-iron ore, dolomite and coal are fed to one end of rotary Kiln and product sponge iron along with char is taken out from the other end. Apart from this, primary
Coal-based sponge iron process The process of the direct reduction of haematite in a rotary kiln is schematically described in the Fig. 1. Haematite and non-coking ... gas from ESP outlet to rotary kiln an insulated duct, which is a hollow cylinder of 43m length and 0.6m diameter, is used. To
Gas-Based Process: This process utilizes natural gas as the reducing agent. Natural gas is reformed to enrich with H2 and CO mixture and this enriched and reformed gas mixture is preheated in gas-based process. A vertical retort is used for the reduction of iron ore as against a rotary kiln in coal based sponge iron process
The sponge iron issuing from the rotary kiln is subjected to a size separation operation by screening to remove the fraction under 3 millimeters. This minus fraction is fed back to the sinter mixer. The oversize sponge iron is treated further as desired, for example in an arc furnace
The invention is about the producing method of the sponge iron. The process is: (1) make the material into the double iron oxide ball; (2) put the double iron oxide ball and the reductant into the reaction tank to get the sponge iron ball mass; (3) put the mass into the thermal insulating flume to separate the reductant, to remove the C, S,O in the protection of the N2 or the H2 to produce the
hydrometallurgical processes. The first step of the process also consumes high energy [10, 11]. Ferronickel smelting of lateritic ores is generally performed by using fossil fuels (coal, oil, natural gas, etc.) as a reductant in a rotary kiln. Nickel and cobalt are firstly reduced because iron has greater affinity to
(SL/RN) Stelco-Lurgi/Republic-National rotary kiln process
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@misc{etde_6653681, title = {Sponge iron in steel's future} author = {Rose, S} abstractNote = {This article includes a description of the Lurgi direct reduction process as modified by Stelco, which uses sub-bituminous coal or lignite as reductant in a rotary kiln. The findings of a published economic comparison of the process with blast furnace reduction is criticized, and alternative figures
Sponge Iron Rotary Kiln, Lime Rotary Kiln, Cement Rotary Kiln manufacturer / supplier in China, offering Sponge Iron Rotary Kiln&Rotary Kiln Process of Making Sponge Iron, Casting Half Rotary Kiln Girth Gear, Power Transmission Parts-Micro-Gear-Straight Bevel Gear and so on
Experiments for the production of sponge iron in a 34 feet long rotary kiln were successfully conducted at the National Metallurgical Laboratory using pellets made from Donimalai haematite ore and bituminous coal from Maharashtra also nut coke. The iron ore was of high grade with 65-66 Fe 1.6-2.05 Si02 and 3.0-3.8 per cent A1 203. sponge iron process
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-stone or raw dolomite) into an inclined rotary kiln, heated counter current to the flow of hot gas and reduced to form sponge
accretion or ring formation during actual manufacture of sponge iron in the temperature range of 9000C to 11000C. Ring formation is a phenomenon occurring exclusively in a rotary kiln, while clusters and agglomerates are common in both rotary kiln and shaft based processes. In the
Also, the process conditions in a sponge iron rotary kiln are dynamic in nature. Hence, the quality keeps fluctuating and is not a constant value. A mathematical mass
Sponge iron being magnetic gets attracted and gets separated from non- magnetic char. The iron ore and coal crushed and screened to respective sizes are fed to rotary kiln through feed tube in pre-determined ratio. The rotary kiln is slightly inclined at an angle 2.5 deg and rotated by
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