The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
T Umadevi - One of the best experts on this subject based on the ideXlab platform.
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influence of Sinter basicity cao sio2 on low and high alumina iron ore Sinter quality
Mineral Processing and Extractive Metallurgy, 2014Co-Authors: T Umadevi, P C MahapatraAbstract:AbstractIron ore Sinter, constituting a major proportion of blast furnace burden, significantly impacts the blast furnace performance. The chemical composition of iron ore fines, particularly alumina, Sinter basicity and Sinter MgO together with the thermal conditions that Sinter blends are subjected to play an important role in the formation of mineral phases in Sinter. To increase the Sinter proportion (70–80%) in blast furnace, lowering of CaO in Sinter Mix is a vital parameter to balance the flux supply without affecting the slag volume and productivity. At present, the alumina content in the Sinter grade iron ore fines at JSW Steel varies from 4 to 6%. The quality of iron ore presently being used calls for extensive investigations to produce low basicity Sinter with high alumina iron ore. Studies have been carried out on low and high alumina iron ore fines to know the influence of Sinter basicity and fuel (coke breeze) addition on Sinter mineralogy, properties and productivity. It is found that with ...
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optimisation of mgo addition in low and high silica iron ore Sinter to improve Sinter reducibility at jsw steel limited
Ironmaking & Steelmaking, 2014Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (<60·0%). Laboratory pot grate Sintering experiments have been carried out to determine the influence of MgO addition on microstructure and reducibility of low and ...
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Influence of Sinter basicity (CaO/SiO2) on low and high alumina iron ore Sinter quality
Mineral Processing and Extractive Metallurgy, 2014Co-Authors: T Umadevi, Rameshwar Sah, P C MahapatraAbstract:AbstractIron ore Sinter, constituting a major proportion of blast furnace burden, significantly impacts the blast furnace performance. The chemical composition of iron ore fines, particularly alumina, Sinter basicity and Sinter MgO together with the thermal conditions that Sinter blends are subjected to play an important role in the formation of mineral phases in Sinter. To increase the Sinter proportion (70–80%) in blast furnace, lowering of CaO in Sinter Mix is a vital parameter to balance the flux supply without affecting the slag volume and productivity. At present, the alumina content in the Sinter grade iron ore fines at JSW Steel varies from 4 to 6%. The quality of iron ore presently being used calls for extensive investigations to produce low basicity Sinter with high alumina iron ore. Studies have been carried out on low and high alumina iron ore fines to know the influence of Sinter basicity and fuel (coke breeze) addition on Sinter mineralogy, properties and productivity. It is found that with ...
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Optimisation of MgO addition in low and high silica iron ore Sinter to improve Sinter reducibility at JSW Steel Limited
Ironmaking & Steelmaking, 2013Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (
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influence of mgo addition on microstructure and properties of low and high silica iron ore Sinter
Mineral Processing and Extractive Metallurgy, 2013Co-Authors: T Umadevi, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. Dolomite is the critical additive for fluxing the Sinter and controlling the Sinter MgO. Recently, the silica level in the Sinter product of the Sinter plant 1 has been varying in the range of 5·51 to 9·58% owing to variation in silica content of iron ore fines. At the same time, as per the blast furnace requirement, the rate of addition of dolomite has been changed from 2·40 to greater than 3·00% at the Sinter plant 1. In iron ore Sinter, MgO plays different roles on Sinter properties at different silica ranges. Because of wide range of fluctuation in iron ore silica it is essential to optimise the MgO addition in Sinter Mix to get desired properties. Laboratory pot grate Sintering experiments have been carried out to know the influence of MgO addition on microstructure and properties of low silica and high silica Sinter. MgO addition has been varied from 1·40 t...
P C Mahapatra - One of the best experts on this subject based on the ideXlab platform.
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influence of Sinter basicity cao sio2 on low and high alumina iron ore Sinter quality
Mineral Processing and Extractive Metallurgy, 2014Co-Authors: T Umadevi, P C MahapatraAbstract:AbstractIron ore Sinter, constituting a major proportion of blast furnace burden, significantly impacts the blast furnace performance. The chemical composition of iron ore fines, particularly alumina, Sinter basicity and Sinter MgO together with the thermal conditions that Sinter blends are subjected to play an important role in the formation of mineral phases in Sinter. To increase the Sinter proportion (70–80%) in blast furnace, lowering of CaO in Sinter Mix is a vital parameter to balance the flux supply without affecting the slag volume and productivity. At present, the alumina content in the Sinter grade iron ore fines at JSW Steel varies from 4 to 6%. The quality of iron ore presently being used calls for extensive investigations to produce low basicity Sinter with high alumina iron ore. Studies have been carried out on low and high alumina iron ore fines to know the influence of Sinter basicity and fuel (coke breeze) addition on Sinter mineralogy, properties and productivity. It is found that with ...
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optimisation of mgo addition in low and high silica iron ore Sinter to improve Sinter reducibility at jsw steel limited
Ironmaking & Steelmaking, 2014Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (<60·0%). Laboratory pot grate Sintering experiments have been carried out to determine the influence of MgO addition on microstructure and reducibility of low and ...
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Influence of Sinter basicity (CaO/SiO2) on low and high alumina iron ore Sinter quality
Mineral Processing and Extractive Metallurgy, 2014Co-Authors: T Umadevi, Rameshwar Sah, P C MahapatraAbstract:AbstractIron ore Sinter, constituting a major proportion of blast furnace burden, significantly impacts the blast furnace performance. The chemical composition of iron ore fines, particularly alumina, Sinter basicity and Sinter MgO together with the thermal conditions that Sinter blends are subjected to play an important role in the formation of mineral phases in Sinter. To increase the Sinter proportion (70–80%) in blast furnace, lowering of CaO in Sinter Mix is a vital parameter to balance the flux supply without affecting the slag volume and productivity. At present, the alumina content in the Sinter grade iron ore fines at JSW Steel varies from 4 to 6%. The quality of iron ore presently being used calls for extensive investigations to produce low basicity Sinter with high alumina iron ore. Studies have been carried out on low and high alumina iron ore fines to know the influence of Sinter basicity and fuel (coke breeze) addition on Sinter mineralogy, properties and productivity. It is found that with ...
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Optimisation of MgO addition in low and high silica iron ore Sinter to improve Sinter reducibility at JSW Steel Limited
Ironmaking & Steelmaking, 2013Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (
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influence of mgo addition on microstructure and properties of low and high silica iron ore Sinter
Mineral Processing and Extractive Metallurgy, 2013Co-Authors: T Umadevi, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. Dolomite is the critical additive for fluxing the Sinter and controlling the Sinter MgO. Recently, the silica level in the Sinter product of the Sinter plant 1 has been varying in the range of 5·51 to 9·58% owing to variation in silica content of iron ore fines. At the same time, as per the blast furnace requirement, the rate of addition of dolomite has been changed from 2·40 to greater than 3·00% at the Sinter plant 1. In iron ore Sinter, MgO plays different roles on Sinter properties at different silica ranges. Because of wide range of fluctuation in iron ore silica it is essential to optimise the MgO addition in Sinter Mix to get desired properties. Laboratory pot grate Sintering experiments have been carried out to know the influence of MgO addition on microstructure and properties of low silica and high silica Sinter. MgO addition has been varied from 1·40 t...
M Prabhu - One of the best experts on this subject based on the ideXlab platform.
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optimisation of mgo addition in low and high silica iron ore Sinter to improve Sinter reducibility at jsw steel limited
Ironmaking & Steelmaking, 2014Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (<60·0%). Laboratory pot grate Sintering experiments have been carried out to determine the influence of MgO addition on microstructure and reducibility of low and ...
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Optimisation of MgO addition in low and high silica iron ore Sinter to improve Sinter reducibility at JSW Steel Limited
Ironmaking & Steelmaking, 2013Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. The reduction properties of the mineral phases formed in the Sinter influences the Sinter reducibility. MgO has a varying effect on Sinter reducibility at different silica contents. A recent trend in blast furnace operation shows that there is a considerable increase in usage of dolomite as a basic flux either directly or through Sinter. Recently the silica levels in the Sinter product of Sinter plant 1(SP1) of JSW Steel Limited have been fluctuating in the range of 5·5–9·6% due to variation in silica content of iron ore fines. At the same time, as per blast furnace requirement, the addition of dolomite has been changed from 2·4 to greater than 3·0% at SP1, and the reducibility of the Sinter decreased (
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influence of mgo addition on microstructure and properties of low and high silica iron ore Sinter
Mineral Processing and Extractive Metallurgy, 2013Co-Authors: T Umadevi, P C Mahapatra, M PrabhuAbstract:AbstractThe quality of iron ore Sinter mainly depends on Sinter mineralogy, which in turn depends on the chemical composition of the Sinter Mix. Dolomite is the critical additive for fluxing the Sinter and controlling the Sinter MgO. Recently, the silica level in the Sinter product of the Sinter plant 1 has been varying in the range of 5·51 to 9·58% owing to variation in silica content of iron ore fines. At the same time, as per the blast furnace requirement, the rate of addition of dolomite has been changed from 2·40 to greater than 3·00% at the Sinter plant 1. In iron ore Sinter, MgO plays different roles on Sinter properties at different silica ranges. Because of wide range of fluctuation in iron ore silica it is essential to optimise the MgO addition in Sinter Mix to get desired properties. Laboratory pot grate Sintering experiments have been carried out to know the influence of MgO addition on microstructure and properties of low silica and high silica Sinter. MgO addition has been varied from 1·40 t...
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optimisation of feo in iron ore Sinter at jsw steel limited
Ironmaking & Steelmaking, 2012Co-Authors: T Umadevi, Pala Karthik, P C Mahapatra, M Prabhu, Madhu RanjanAbstract:AbstractCoke breeze is the most common fuel used in Sintering, and its usage depends on the alumina content and fineness of the Sinter Mix. The coke breeze consumption in the JSW Steel Limited Sinter plant was high compared to many other Sinter plants in the world, and as there was a local shortage, optimisation in the Sinter plants was necessary. FeO is an indicator of the thermal state of the Sintering process and is employed as a quality control tool at many plants. Laboratory pot Sinters were made, and the variation in FeO was affected by varying the amount of coke breeze in the green Mix from 55 to 85 kg t−1 of Sinter. The produced Sinters were evaluated with respect to productivity, strength (tumbler index), reduction degradation index (RDI), reducibility and microstructural phases in the FeO range between 6·2 and 14·8%. It was found that the Sinter with FeO range of 8·60–9·88% showed higher productivity and higher strength with desired RDI of ⩽27% and reducibility of >60%. Analysis of plant data ha...
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influence of iron ore fines feed size on microstructure productivity and quality of iron ore Sinter
Isij International, 2011Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M Prabhu, Madhu RanjanAbstract:The Sinter structure and its characteristics mainly depend on the raw material chemistry, size, size distribution and the Sintering process parameters. In Sintering process heat is supplied by coke breeze in the Sinter Mix to raise the bed temperature to achieve partial fusion and diffusion bonding. Airflow rate and flame front speed in Sintering process has been found to guide the performance of the Sinter plant and these parameters mainly depends on the Sinter bed permeability. The flame front speed (bed permeability) has been considered as one of the important operating parameter and it depends on several factors; the feed size of the Sinter being one of the most important parameter among them. Since iron ore proportion is at higher side in the Sinter Mix, its size fraction is very important. JSW Steel Sinter plant receives iron ore fines of –10 mm size from Bellary – Hospet region which consist of 3 to 9% bigger than 10 mm and 30 to 35% smaller than 0.15 mm size fraction. It is well known that larger particles favour diffusion bonding and smaller particles favour slag bonding in Sintering process. Accordingly, the study of the assimilation characteristics of different size range iron ore has an important role to control the reactions in the Sinter bed and to obtain the target mineral structure. Too much variation in coarser and finer particle size range in Sinter Mix, the behavior of these +10 mm and –0.15 mm particles have been a subject of investigation and it is necessary to understand the role of iron ore particle size on Sinter microstructure, Sinter strength, Sinter RDI, and productivity. In present work pot grate Sintering experiments have been carried out in laboratory with different level iron ore size (mean particle size from 1.22 to 3.95 mm) to understand the influence of iron ore mean particle size on mineralogy, productivity, physical and metallurgical properties of the Sinter. Sinter productivity increased with increase in iron ore mean particle size due to increased flame front speed (FFS) and improved bed permeability with lower Sintering time. Sinter with iron ore mean particle size of 2.59 mm (Classifier fines) yielded better Sinter strength with lower fines (–5 mm) and lower RDI. Higher Sinter strength is due to effective distribution of acicular silico ferrites of calcium and alumina (SFCA) phases. The improvement in Sinter RDI is due to the change in proportion of magnetite and hematite phase with flame front speed.
R. Pietruck - One of the best experts on this subject based on the ideXlab platform.
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Influence of Sinter Mix materials on the environmental impact of high productivity iron ore Sintering
Europace, 2005Co-Authors: R. Fisher, E. Garcia Carcedo, E. Alaiz Alvarez, R. PietruckAbstract:An integrated research project was carried out on the iron ore Sintering process to investigate: (i) The effects of Sinter Mix composition on the emissions of toxic organic compounds such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), heavy metals and oxides of nitrogen (NOx); (ii) conditions whereby revert materials can continue to be recycled through the Sinter plant; and, (iii) the use of Sinter Mix additives and selective catalytic reduction with ammonia for the minimisation of NOx emissions. The studies were performed by a fully co-ordinated programme of work involving Corus UK Limited, BFI, CENIM and ACERALIA as the main partners, and with the participation of INCAR and the Instituto de Catalisis y Petroleoquimica (ICP) in Madrid as sub-contractors to ACERALIA. The main focus of work for each partner was as follows: (i) Corus UK Limited and BFI studied the influence of the primary Sinter Mix components (viz., ores and fuels, reverts) and Sintering conditions on formation of PAHs and PCDD/Fs by means of investigations involving both Sinter pot experiments and measurements on production plants. The Sinter pot investigations were conducted by Corus UK Limited at an experimental Sinter pot at Corns's Scunthorpe Works; some plant measurements were also performed at the Sinter plant at Scunthorpe. All of the work carried out by BFI was based on measurements at a German Sinter plant. (ii) ACERALIA and CENIM investigated the influence of Sinter Mix composition on the formation of nitrogen oxides and on the emissions of heavy metals, alkali metals and chlorides. (iii) ACERALIA, INCAR and ICP co-operated in the development and testing of novel catalysts for the removal of nitrogen oxides from Sintering emissions by SCR with ammonia. From Sinter pot experiments it was established that there was a strong correlation between the chloride content of the raw Sinter feed and the emissions of PCDD/Fs and PCBs. The effects of chloride were most marked at chloride concentrations >350 mg/kg in the raw feed, but were relatively small at chlorides concentrations
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influence of Sinter Mix materials on the environmental impact of high productivity iron ore Sintering
Europace, 2005Co-Authors: R. Fisher, Garcia E Carcedo, Alaiz E Alvarez, R. PietruckAbstract:An integrated research project was carried out on the iron ore Sintering process to investigate: (i) The effects of Sinter Mix composition on the emissions of toxic organic compounds such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), heavy metals and oxides of nitrogen (NOx); (ii) conditions whereby revert materials can continue to be recycled through the Sinter plant; and, (iii) the use of Sinter Mix additives and selective catalytic reduction with ammonia for the minimisation of NOx emissions. The studies were performed by a fully co-ordinated programme of work involving Corus UK Limited, BFI, CENIM and ACERALIA as the main partners, and with the participation of INCAR and the Instituto de Catalisis y Petroleoquimica (ICP) in Madrid as sub-contractors to ACERALIA. The main focus of work for each partner was as follows: (i) Corus UK Limited and BFI studied the influence of the primary Sinter Mix components (viz., ores and fuels, reverts) and Sintering conditions on formation of PAHs and PCDD/Fs by means of investigations involving both Sinter pot experiments and measurements on production plants. The Sinter pot investigations were conducted by Corus UK Limited at an experimental Sinter pot at Corns's Scunthorpe Works; some plant measurements were also performed at the Sinter plant at Scunthorpe. All of the work carried out by BFI was based on measurements at a German Sinter plant. (ii) ACERALIA and CENIM investigated the influence of Sinter Mix composition on the formation of nitrogen oxides and on the emissions of heavy metals, alkali metals and chlorides. (iii) ACERALIA, INCAR and ICP co-operated in the development and testing of novel catalysts for the removal of nitrogen oxides from Sintering emissions by SCR with ammonia. From Sinter pot experiments it was established that there was a strong correlation between the chloride content of the raw Sinter feed and the emissions of PCDD/Fs and PCBs. The effects of chloride were most marked at chloride concentrations >350 mg/kg in the raw feed, but were relatively small at chlorides concentrations <350 mg/kg. Most European Sinter plants operate with chloride concentrations of <250 mg/kg in the raw feed and these findings, therefore, explain to some extent why emissions from these plants are normally in the narrow range of 1 to 3 ng I-TEQ/Nm3. Variations in the coke chloride content had a relatively small effect on PCDD/F emission concentrations, while changes in the iron blend had an insignificant effect on PCDD/F emissions. However, the addition of 1% burnt lime to the Sinter Mix reduced emissions of PCDD/Fs by an average of 12.8%. It was established that a strong correlation existed between the concentrations of PCDD/Fs and WHO-12 PCBs (expressed in terms of I-TEQ values) such that the contribution of WHO-12 PCBs to the overall I-TEQ concentration is typically 9-10% of that of PCDD/Fs. The close relationship found between PCDD/F and PCB concentrations suggests that there is a common link between the formation of these compounds. However, no correlation was found between the concentrations of PCDD/Fs and PAHs. In measurements on production scale plants the influence of reverts on PCDD/F emissions was more difficult to detect.
Madhu Ranjan - One of the best experts on this subject based on the ideXlab platform.
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optimisation of feo in iron ore Sinter at jsw steel limited
Ironmaking & Steelmaking, 2012Co-Authors: T Umadevi, Pala Karthik, P C Mahapatra, M Prabhu, Madhu RanjanAbstract:AbstractCoke breeze is the most common fuel used in Sintering, and its usage depends on the alumina content and fineness of the Sinter Mix. The coke breeze consumption in the JSW Steel Limited Sinter plant was high compared to many other Sinter plants in the world, and as there was a local shortage, optimisation in the Sinter plants was necessary. FeO is an indicator of the thermal state of the Sintering process and is employed as a quality control tool at many plants. Laboratory pot Sinters were made, and the variation in FeO was affected by varying the amount of coke breeze in the green Mix from 55 to 85 kg t−1 of Sinter. The produced Sinters were evaluated with respect to productivity, strength (tumbler index), reduction degradation index (RDI), reducibility and microstructural phases in the FeO range between 6·2 and 14·8%. It was found that the Sinter with FeO range of 8·60–9·88% showed higher productivity and higher strength with desired RDI of ⩽27% and reducibility of >60%. Analysis of plant data ha...
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influence of iron ore fines feed size on microstructure productivity and quality of iron ore Sinter
Isij International, 2011Co-Authors: T Umadevi, A Brahmacharyulu, P C Mahapatra, M Prabhu, Madhu RanjanAbstract:The Sinter structure and its characteristics mainly depend on the raw material chemistry, size, size distribution and the Sintering process parameters. In Sintering process heat is supplied by coke breeze in the Sinter Mix to raise the bed temperature to achieve partial fusion and diffusion bonding. Airflow rate and flame front speed in Sintering process has been found to guide the performance of the Sinter plant and these parameters mainly depends on the Sinter bed permeability. The flame front speed (bed permeability) has been considered as one of the important operating parameter and it depends on several factors; the feed size of the Sinter being one of the most important parameter among them. Since iron ore proportion is at higher side in the Sinter Mix, its size fraction is very important. JSW Steel Sinter plant receives iron ore fines of –10 mm size from Bellary – Hospet region which consist of 3 to 9% bigger than 10 mm and 30 to 35% smaller than 0.15 mm size fraction. It is well known that larger particles favour diffusion bonding and smaller particles favour slag bonding in Sintering process. Accordingly, the study of the assimilation characteristics of different size range iron ore has an important role to control the reactions in the Sinter bed and to obtain the target mineral structure. Too much variation in coarser and finer particle size range in Sinter Mix, the behavior of these +10 mm and –0.15 mm particles have been a subject of investigation and it is necessary to understand the role of iron ore particle size on Sinter microstructure, Sinter strength, Sinter RDI, and productivity. In present work pot grate Sintering experiments have been carried out in laboratory with different level iron ore size (mean particle size from 1.22 to 3.95 mm) to understand the influence of iron ore mean particle size on mineralogy, productivity, physical and metallurgical properties of the Sinter. Sinter productivity increased with increase in iron ore mean particle size due to increased flame front speed (FFS) and improved bed permeability with lower Sintering time. Sinter with iron ore mean particle size of 2.59 mm (Classifier fines) yielded better Sinter strength with lower fines (–5 mm) and lower RDI. Higher Sinter strength is due to effective distribution of acicular silico ferrites of calcium and alumina (SFCA) phases. The improvement in Sinter RDI is due to the change in proportion of magnetite and hematite phase with flame front speed.
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influence of magnesia on iron ore Sinter properties and productivity
Ironmaking & Steelmaking, 2009Co-Authors: T Umadevi, K. Nelson, P C Mahapatra, M Prabhu, Madhu RanjanAbstract:AbstractDolomite and other MgO bearing materials are being increasingly used as basic flux constituents for production of fluxed Sinters. Addition of flux materials in Sinter influences the resultant Sinter microstructure and chemical properties. The physical and metallurgical properties of Sinter mainly depend on mineralogy of the Sinter. Dolomite is the source of double carbonate of calcium and magnesium. Recent studies reveal that, apart from the additional fuel needed, the addition of dolomite and MgO bearing material greatly influences the magnetite content and the properties of the Sinter produced. The increasing use of MgO bearing fluxes in the blast furnace burden, and the trend to incorporate a major part of fluxes in the Sinter Mix led to an investigation of the influence of MgO on Sinter properties and productivity. In this study, the systematic investigation has been made on the influence of MgO% (1·4 to 2·6) on Sinter mineralogy and Sinter properties with dolomite. Microstructural examination...
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Recycling of steel plant mill scale via iron ore pelletisation process
Ironmaking & Steelmaking, 2009Co-Authors: T Umadevi, P C Mahapatra, M. G. Sampath Kumar, T. Mohan Babu, Madhu RanjanAbstract:AbstractMill scale is an iron oxide waste generated during steelmaking, casting and rolling. Total generation of mill scale at JSWSL is around 150 t/day and contains 60–70%FeO and 30–35%Fe2O3. To recover the iron, the mill scale must be smelted in a blast furnace or other reduction furnace; however, it is usually too fine to use without previous agglomeration such as via pellet or Sinter Mix. JSWSL operates a 4·2 Mtpa pellet plant to produce pellets for Corex and BF ironmaking units. The aim of this study is to determine the effect of mill scale on pellet properties. Detailed laboratory basket trials were conducted using up to 40% of mill scale in the pellet Mix. The addition of mill scale up to 10% is considered to provide the optimum balance of chemical, physical and metallurgical properties of the pellet.