The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Mark I. Pownceby - One of the best experts on this subject based on the ideXlab platform.

  • Insights into the formation of Iron Ore Sinter bonding phases
    2020
    Co-Authors: Mark I. Pownceby, Nathan A.s. Webster
    Abstract:

    During the Iron Ore Sintering process, Iron Ore fines (

  • A Review of the Chemistry, Structure and Formation Conditions of Silico-Ferrite of Calcium and Aluminum (‘SFCA’) Phases
    Isij International, 2018
    Co-Authors: S. Nicol, Jiang Chen, Mark I. Pownceby, Nathan A.s. Webster
    Abstract:

    This paper critically reviews published research on silico-ferrite of calcium and aluminum (‘SFCA’) phases, the major bonding phases found in modern Iron Ore Sinters. In particular, we focus on describing the different ‘SFCA’ phases formed in Iron Ore Sinter and examining their phase chemistry, crystal structures, characteristic textures and microstructures, and formation conditions. Information for the two main bonding phases SFCA and SFCA-I are reviewed and, based on a critical analysis of the data, we suggest future research directions required to generate the information necessary to fully describe the properties of both phases.

  • Predicting Iron Ore Sinter strength through partial least square regression (PLSR) analysis of X-ray diffraction patterns
    Powder Diffraction, 2017
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Natalie Ware, Rachel Pattel
    Abstract:

    The decrease in quality of Australian Iron Ore, coupled with the demand for mOre efficient energy use, means that closer monitoring and optimisation of process conditions for Iron Ore Sinter production is required. Here, the suitability of using partial least-squares regression analysis of powder X-ray diffraction data, collected for Iron Ore Sinter samples, for the prediction of Iron Ore Sinter strength has been further assessed. In addition, a preliminary assessment of the effect of 2θ range on the quality of prediction has been made. For the purposes of process control, the level of correlation between predicted strength and actual Sinter strength would inform an operator whether or not the process was operating within the acceptable limits, or whether there was a potential problem requiring further investigation or rapid intervention. Reducing the 2θ range was found to reduce the level of correlation between predicted and actual strength, to a point where the particular analysis may no longer be suitable for process control.

  • fundamentals of silico ferrite of calcium and aluminium sfca and sfca i Iron Ore Sinter bonding phase formation effects of mill scale addition
    Powder Diffraction, 2017
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Rachel Pattel
    Abstract:

    The thermal decomposition of mill scale, and the effect of mill scale addition on the formation and decomposition of Silico-Ferrite of Calcium and Aluminium (SFCA) and SFCA-I Iron Ore Sinter bonding phases, has been investigated using in situ X-ray diffraction. Application of the external standard method of quantitative phase analysis of the in situ data collected during decomposition of the mill scale highlighted the applicability of this method for the determination of the nature and abundance of amorphous material in a mineral sample. Increasing mill scale addition from 2.6 to 10.6 and to 21.2 wt% in an otherwise synthetic Sinter mixture composition designed to form SFCA did not significantly affect the thermal stability ranges of SFCA-I or SFCA, nor did it significantly affect the amount of each of SFCA or SFCA-I, which formed. This was attributed to the low impurity (i.e. Mn, Mg) concentration in the mill scale, and also the transformation to hematite during heating of the wustite and magnetite present in the mill scale, with the hematite available for reaction to form SFCA and SFCA-I.

  • Fundamentals of Silico-Ferrite of Calcium and Aluminum (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of CaO:SiO_2 Ratio
    Metallurgical and Materials Transactions B, 2014
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Ian C. Madsen, Andrew J. Studer, James R. Manuel, Justin A. Kimpton
    Abstract:

    Effects of basicity, B (CaO:SiO_2 ratio) on the thermal range, concentration, and formation mechanisms of silico-ferrite of calcium and aluminum (SFCA) and SFCA-I Iron Ore Sinter bonding phases have been investigated using an in situ synchrotron X-ray diffraction-based methodology with subsequent Rietveld refinement-based quantitative phase analysis. SFCA and SFCA-I phases are the key bonding materials in Iron Ore Sinter, and improved understanding of the effects of processing parameters such as basicity on their formation and decomposition may assist in improving efficiency of industrial Iron Ore Sintering operations. Increasing basicity significantly increased the thermal range of SFCA-I, from 1363 K to 1533 K (1090 °C to 1260 °C) for a mixture with B  = 2.48, to ~1339 K to 1535 K (1066 °C to 1262 °C) for a mixture with B  = 3.96, and to ~1323 K to 1593 K (1050 °C to 1320 °C) at B  = 4.94. Increasing basicity also increased the amount of SFCA-I formed, from 18 wt pct for the mixture with B  = 2.48 to 25 wt pct for the B  = 4.94 mixture. Higher basicity of the starting Sinter mixture will, therefOre, increase the amount of SFCA-I, considered to be mOre desirable of the two phases. Basicity did not appear to significantly influence the formation mechanism of SFCA-I. It did, however, affect the formation mechanism of SFCA, with the decomposition of SFCA-I coinciding with the formation of a significant amount of additional SFCA in the B  = 2.48 and 3.96 mixtures but only a minor amount in the highest basicity mixture. In situ neutron diffraction enabled characterization of the behavior of magnetite after melting of SFCA produced a magnetite plus melt phase assemblage.

Nathan A.s. Webster - One of the best experts on this subject based on the ideXlab platform.

  • Insights into the formation of Iron Ore Sinter bonding phases
    2020
    Co-Authors: Mark I. Pownceby, Nathan A.s. Webster
    Abstract:

    During the Iron Ore Sintering process, Iron Ore fines (

  • A Review of the Chemistry, Structure and Formation Conditions of Silico-Ferrite of Calcium and Aluminum (‘SFCA’) Phases
    Isij International, 2018
    Co-Authors: S. Nicol, Jiang Chen, Mark I. Pownceby, Nathan A.s. Webster
    Abstract:

    This paper critically reviews published research on silico-ferrite of calcium and aluminum (‘SFCA’) phases, the major bonding phases found in modern Iron Ore Sinters. In particular, we focus on describing the different ‘SFCA’ phases formed in Iron Ore Sinter and examining their phase chemistry, crystal structures, characteristic textures and microstructures, and formation conditions. Information for the two main bonding phases SFCA and SFCA-I are reviewed and, based on a critical analysis of the data, we suggest future research directions required to generate the information necessary to fully describe the properties of both phases.

  • Predicting Iron Ore Sinter strength through partial least square regression (PLSR) analysis of X-ray diffraction patterns
    Powder Diffraction, 2017
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Natalie Ware, Rachel Pattel
    Abstract:

    The decrease in quality of Australian Iron Ore, coupled with the demand for mOre efficient energy use, means that closer monitoring and optimisation of process conditions for Iron Ore Sinter production is required. Here, the suitability of using partial least-squares regression analysis of powder X-ray diffraction data, collected for Iron Ore Sinter samples, for the prediction of Iron Ore Sinter strength has been further assessed. In addition, a preliminary assessment of the effect of 2θ range on the quality of prediction has been made. For the purposes of process control, the level of correlation between predicted strength and actual Sinter strength would inform an operator whether or not the process was operating within the acceptable limits, or whether there was a potential problem requiring further investigation or rapid intervention. Reducing the 2θ range was found to reduce the level of correlation between predicted and actual strength, to a point where the particular analysis may no longer be suitable for process control.

  • fundamentals of silico ferrite of calcium and aluminium sfca and sfca i Iron Ore Sinter bonding phase formation effects of mill scale addition
    Powder Diffraction, 2017
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Rachel Pattel
    Abstract:

    The thermal decomposition of mill scale, and the effect of mill scale addition on the formation and decomposition of Silico-Ferrite of Calcium and Aluminium (SFCA) and SFCA-I Iron Ore Sinter bonding phases, has been investigated using in situ X-ray diffraction. Application of the external standard method of quantitative phase analysis of the in situ data collected during decomposition of the mill scale highlighted the applicability of this method for the determination of the nature and abundance of amorphous material in a mineral sample. Increasing mill scale addition from 2.6 to 10.6 and to 21.2 wt% in an otherwise synthetic Sinter mixture composition designed to form SFCA did not significantly affect the thermal stability ranges of SFCA-I or SFCA, nor did it significantly affect the amount of each of SFCA or SFCA-I, which formed. This was attributed to the low impurity (i.e. Mn, Mg) concentration in the mill scale, and also the transformation to hematite during heating of the wustite and magnetite present in the mill scale, with the hematite available for reaction to form SFCA and SFCA-I.

  • Fundamentals of Silico-Ferrite of Calcium and Aluminum (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of CaO:SiO_2 Ratio
    Metallurgical and Materials Transactions B, 2014
    Co-Authors: Nathan A.s. Webster, Mark I. Pownceby, Ian C. Madsen, Andrew J. Studer, James R. Manuel, Justin A. Kimpton
    Abstract:

    Effects of basicity, B (CaO:SiO_2 ratio) on the thermal range, concentration, and formation mechanisms of silico-ferrite of calcium and aluminum (SFCA) and SFCA-I Iron Ore Sinter bonding phases have been investigated using an in situ synchrotron X-ray diffraction-based methodology with subsequent Rietveld refinement-based quantitative phase analysis. SFCA and SFCA-I phases are the key bonding materials in Iron Ore Sinter, and improved understanding of the effects of processing parameters such as basicity on their formation and decomposition may assist in improving efficiency of industrial Iron Ore Sintering operations. Increasing basicity significantly increased the thermal range of SFCA-I, from 1363 K to 1533 K (1090 °C to 1260 °C) for a mixture with B  = 2.48, to ~1339 K to 1535 K (1066 °C to 1262 °C) for a mixture with B  = 3.96, and to ~1323 K to 1593 K (1050 °C to 1320 °C) at B  = 4.94. Increasing basicity also increased the amount of SFCA-I formed, from 18 wt pct for the mixture with B  = 2.48 to 25 wt pct for the B  = 4.94 mixture. Higher basicity of the starting Sinter mixture will, therefOre, increase the amount of SFCA-I, considered to be mOre desirable of the two phases. Basicity did not appear to significantly influence the formation mechanism of SFCA-I. It did, however, affect the formation mechanism of SFCA, with the decomposition of SFCA-I coinciding with the formation of a significant amount of additional SFCA in the B  = 2.48 and 3.96 mixtures but only a minor amount in the highest basicity mixture. In situ neutron diffraction enabled characterization of the behavior of magnetite after melting of SFCA produced a magnetite plus melt phase assemblage.

T Umadevi - One of the best experts on this subject based on the ideXlab platform.

  • optimisation of mgo addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at jsw steel limited
    Ironmaking & Steelmaking, 2014
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 ...

  • Optimisation of MgO addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at JSW Steel Limited
    Ironmaking & Steelmaking, 2013
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 (

  • influence of mgo addition on microstructure and properties of low and high silica Iron Ore Sinter
    Mineral Processing and Extractive Metallurgy, 2013
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu
    Abstract:

    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...

  • optimisation of feo in Iron Ore Sinter at jsw steel limited
    Ironmaking & Steelmaking, 2012
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu, P Karthik, M Ranjan
    Abstract:

    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...

  • Influence of LD slag on Iron Ore Sinter properties and productivity
    2010
    Co-Authors: T Umadevi, P C Mahapatra
    Abstract:

    Large amounts of slags from steel plants are produced through basic oxygen furnace and LD furnace. The main purpose of LD process is to convert the molten pig Iron and steel scraps into high quality steel. In India, the generation of steel melting slag is over 4 to 4.5 Mt per annum. The amount of steel slags from different steel industries are 150–200 kg/t of steel produced. Disposal of large quantities of slag becomes a big envIronmental concern. JSW Steel Limited is a 7.0 Mtpa integrated steel plant and produces 3200 tons of total steel making slag per day and in that LD slag is 2000 to 2500 t/day. This LD slag consists of 45.75% CaO, 22.0 % Fe and 8.22% MgO. Thus, recycling of LD slag through the Sintering process recovers lime, Iron and magnesia and thereby saving of flux material and Iron Ore. Due to high content of CaO one can replace LD slag by limestone in Sintering process. Detail investigation was carried out through lab scale studies for estimating the maximum permissible limits of usage of LD slag in Sinter making and to know the influence of LD slag addition on Sinter productivity and properties. Experiments were conducted using the LD slag in Sinter making from 0 to 60kg/t of Sinter. FeO content of the Sinter decreased, Sinter productivity increased with increase in LD slag addition. Decrease in FeO content is due to decrease in Sinter bed temperature and increase in productivity is due to decrease in LOI content of the Sinter mix and absence of weight loss due to calcination process. The Sinter strength and RDI of the Sinter deteriorated due to non availability of free CaO in LD slag and this reduces the formation of calcium ferrites phase and mOre Fe2O3 remains as free phase due to less reaction with CaO. From the test results it was found that 30 to 35 kg LD slag can be used per ton of Sinter to get desired properties of the Sinter.

M Prabhu - One of the best experts on this subject based on the ideXlab platform.

  • optimisation of mgo addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at jsw steel limited
    Ironmaking & Steelmaking, 2014
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 ...

  • Optimisation of MgO addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at JSW Steel Limited
    Ironmaking & Steelmaking, 2013
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 (

  • influence of mgo addition on microstructure and properties of low and high silica Iron Ore Sinter
    Mineral Processing and Extractive Metallurgy, 2013
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu
    Abstract:

    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...

  • optimisation of feo in Iron Ore Sinter at jsw steel limited
    Ironmaking & Steelmaking, 2012
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu, P Karthik, M Ranjan
    Abstract:

    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...

  • influence of coating granulation process on Iron Ore Sinter quality and productivity
    Steel Research International, 2010
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu, A V Deodhar, Madhu Ranjan
    Abstract:

    For better blast furnace performance, there has always been a need for better quality raw materials like Sinter, lump Ore, and pellets. Among these raw materials the usage of Sinter in blast furnace is at higher side compared to other Iron bearing materials. As the quality of Sinter product improves, its usage in blast furnaces also increases. Iron Ore fines are the main source for Sinter making. To improve the Sinter properties it is necessary to provide good quality of Iron Ore fines. Due to depletion of high grade Iron Ore resources, goethite and limonitic Ore content in Iron Ore fines is expected to increase gradually. Usually limonitic and goethite Ore are associated with higher alumina and LOI. The conventional Sintering process is one of the well established processes for high quality hematite Ore. It does not fully respond to the low grade Iron Ore associated with goethite and limonite. This has led to deterioration in Sinter properties and productivity. In recent years the improvement in the quasi-particle structure with the granulation process is an effective method for improving Sinter quality and productivity. To improve the Sinter quality and productivity for low grade Iron Ore fines, different granulation processes like the conventional one, and other two advanced granulation processes like coke breeze, and flux & coke breeze coating granulation were studied in detail by conducting laboratory pot grate Sintering experiments. From the test results it was found that Sinter productivity, physical and metallurgical properties of the Sinter improved with flux & coke breeze coating granulation process compared to conventional and coke breeze coating granulation process. Proper selection of the granulation time is very important to achieve the desired Sinter properties. In the present work detailed laboratory experiments have been carried out by varying the coating time from 30s to 110s to study the influence of flux & coke breeze coating granulation time on mineralogy, productivity, physical, and metallurgical properties of Sinter. With a coating granulation time of 50s, higher productivity, higher yield, and stronger Sinter (higher T.I) with lower RDI and -5mm size Sinter were achieved.

P C Mahapatra - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of Iron Ore Sinter Properties Using Statistical Technique
    Transactions of the Indian Institute of Metals, 2017
    Co-Authors: Vikash Kumar, S. D. S. S. Sairam, Satendra Kumar, Akhil Singh, Deepak Nayak, P C Mahapatra
    Abstract:

    Due to the drastic change in Iron Ore qualities, maintaining consistency in Sinter property has become a challenge for steel manufacturing industries, resulting the irregularities and disturbances in the blast furnace Iron making. The present work aimed to develop a prediction model for physical, mechanical and high temperature properties of Iron Ore Sinter well in advance from the plant process parameters to support smooth functioning of the furnace. Correlation matrix, multiple linear regression and artificial neural network (ANN) analysis were performed for the development of the model. This predictive system for three important Sinter properties [Mean particle size (MPS), tumbler index (TI) and reduction degradation index (RDI)] was established based on back propagation (BP) neural network, which was trained and tested by actual plant data. The prediction accuracy of MPS, TI and RDI using that ANN model is 79, 91 and 76 %, respectively. A user-friendly graphical user interface has been developed using C language based on the model. The application results showed that the prediction system had high accuracy rate, stability and reliability.

  • optimisation of mgo addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at jsw steel limited
    Ironmaking & Steelmaking, 2014
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 ...

  • Optimisation of MgO addition in low and high silica Iron Ore Sinter to improve Sinter reducibility at JSW Steel Limited
    Ironmaking & Steelmaking, 2013
    Co-Authors: T Umadevi, P C Mahapatra, A. Brahmacharyulu, M Prabhu
    Abstract:

    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 (

  • influence of mgo addition on microstructure and properties of low and high silica Iron Ore Sinter
    Mineral Processing and Extractive Metallurgy, 2013
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu
    Abstract:

    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...

  • optimisation of feo in Iron Ore Sinter at jsw steel limited
    Ironmaking & Steelmaking, 2012
    Co-Authors: T Umadevi, P C Mahapatra, M Prabhu, P Karthik, M Ranjan
    Abstract:

    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...