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Tunnel kiln is thermal equipment for long-term continuous production. The carbothermic reduction of iron ore takes place in the tunnel kiln. The reduction mix, consisting of coal or coke fine and limestone, is charged with iron ore briquette in Sic container. The materials are arranged in the form of concentric …
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Aug 09, 2016· We require coal based DRI (Sponge Iron) as per below specification which is produced through rotary kiln process: Fe Total: 88 – 90% Fe Metal: 78-80% Metallisation: 87% minimum Sulphur: 0.04% max. Phosphorus: 0.07% max. Carbon : 0.06 – 0.10% 5000T MONTHLY QQ77317532 ...
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Quality of sponge iron made by the Tunnel Kiln technology is superior as compared to that made from the rotary kilns because, while the input raw material gets just about 24hours for the reaction, the figures almost reverse in case of the Tunnel Kiln.
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The utility model belongs to a wide body ball-shaped sponge iron tunnel kiln. The utility model is characterized in that a clinkering zone inner wall and a kiln top are respectively casting integration, thermal insulation layers are arranged between the clinkering zone inner wall and an out shell and between the kiln top and the out shell, a left side wall, a right …
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Jul 09, 2009· Continuous experiment was performed on a industrial scale for the production of sponge iron by using tunnel kiln furnace. Crushed ores were classified into fwo parts of which one consists of the size 10-40min, and another of the size under 10mm. The latter were crushed again up to all under 30mesh. Ores of the size 10-40mm were …
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Sponge iron production by tunnel kiln method was developed from 1911 as Höganäs method in Sweden After many modifications now this process is a sufficient and effective method for sponge iron production The main advantage of tunnel kiln process is the possibility to build small plants with low investment costs which are feasible economically.
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Innov Engineering advanced tunnel kiln technology is arguably the most sufficient and effective method for sponge iron production which allows for economically feasible plants. The tunnel kilns enable continuous process in that as some materials are beginning to heat at one end of the device, others are being fired in the middle, and more are ...
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CV. Asri Keramik heavily promoted the use of Tunnel Kiln to produce sponge iron on following basis: a) Tunnel Kiln is the most effective method for direct reduction process as the firing temperature is controlled and maintained thus energy loss is kept to a minimum. b) It is costly to produce pig iron as it is regarded as double process.
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Jul 09, 2009· The max. temp of the kiln was kept at about 1300°C. The seduced products were solid mass of sp. gr. about B.G. The sp. gr. of 7 may be obtained, if desired, by suitably charging conditions. According to this experiment it was shown that the sponge iron might be easily produced by tunnel kiln.
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TUNNEL KILN (Coal-based DRI Plant) Production of sponge iron by Tunnel Kiln technology was developed in 1911 as Höganäs method. Now very popular, the technology has become an effective method for sponge iron production. With the Tunnel Kiln technology, it is possible to build small plants with low investment costs. ...
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The invention discloses a technology for producing sponge iron in a tunnel kiln. The technology mainly solves the problems that an existing tunnel kiln technology is low in capacity, high in energy consumption, large in loss and the like. Raw materials, a reducing agent and additives are mixed and subjected to ball milling to obtain a ball grinding …
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CASE GROUP. DRI (Direct Reducted Iron) Tunnel Kiln was commissioned on 24 November 2011. CASE gave this technology to India and this was also first of its kind in India. The process has been established now after earlier hiccups. The process of Tunnel Kiln uses fines of Iron ore and Coal which are mixed together in specified propotions to ...
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Although iron powder could be produced in sponge iron tunnel kiln production line and it is the main raw material for powder metallurgy production lines. Process . In sponge iron production plant by tunnel kiln method, after crushing and screening raw materials, iron ore, coal and limestone are mixed and charged in storage bins in certain ratios
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Sponge iron production by tunnel kiln method was developed from 1911 as Höganäs method in Sweden. After many modifications, now this process is a sufficient and effective method for sponge iron production. The main advantage of tunnel kiln process is the possibility to build small plants with low investment costs which are feasible economically.
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Tunnel Kiln Process Sponge Iron Technology. Tunnel kiln furnace are evolving as an alternative to Rotary kiln process. Iron ore fines and the low grade beneficiated iron ore cake are directly used for manufacturing of sponge iron in tunnel kilns. The material bed in Tunnel kiln being stationary it does not require high strength and ...
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An energy-saving high-efficiency reduction sponge iron tunnel kiln comprises a kiln body, a sealing thermal insulating door, a thermoelectric couple, a sand seal tank I, a sand seal tank II, a sand seal tank III and a sand seal tank IV. The kiln body comprises a cooling preheating segment and a heating reduction segment nozzle; a guide rail I, a guide rail II, …
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The tunnel kilns have the ability to convert Haematite and Magnetite sponge iron, and also work well with coal fines and mill scale. Operational Benefits of Tunnel Kiln. The tunnel kilns conserve energy by capturing heat at the cooling end and recalculating it to help pre-heat materials that are entering the device. The pre heating, low energy ...
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