The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform

De Yong Wang - One of the best experts on this subject based on the ideXlab platform.

  • Research on the Thermodynamics and Kinetics of Chromium Ore Smelting Reduction Process for Producing Stainless Steel
    Applied Mechanics and Materials, 2013
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    For describing and resolving the process of Chromium Ore smelting reduction preferably, the research status on the thermodynamics and kinetics of Chromium Ore smelting reduction process was summarized, based on the introduction of the process for smelting stainless steel with hot metal in a converter. The existing problems for smelting stainless steel by Chromium Ore smelting reduction in a converter were also discussed and some suggestions were made for the future work. A lot of investigations about the thermodynamics and the reduction mechanisms of Chromium Ore have been done. However, the consistent view about the thermodynamic feasibility and the mechanism of smelting reduction has not been achieved, so the application of research results is limited. Little work about the reaction kinetic model for the production of stainless steel by Chromium Ore smelting reduction and direct alloying has been done. So the synthetic kinetic model including a dissolution model and a reduction model of Chromium Ore should be built to predict and control accurately the process.

  • Heat Balance Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The heat balance calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. In the heat balance calculation, the heat consumption is calculated according to the actual reduction process in the converter and the thermal efficiency and the coefficient of thermal energy of smelting reduction converter are calculated. The calculation results show that the thermal efficiency η is 60.143% and the coefficient of thermal energy KT is 71.743%. The calculated relative error of heat balance is 0.019%. Heat balance calculation is an important part of the converter smelting process calculation, and it is extremely significant in the pursuit of the converter production of high quality and low energy consumption.

  • Mixture Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The mixture calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. The calculation results show that the required total consumption of chrome Ore, coke and limestone in the smelting reduction process is 224.942 kg, 154.9 kg and 99.223 kg, respectively, under the conditions of this calculation. The total amount of slag includes the amounts of hot metal elements oxidation into slag, lining erosion into slag and Chromium Ore, coke and adding flux into the slag, which is calculated respectively according to the basic raw data and the set values of process parameters. The slag component is confirmed, namely, the actual basicity w(CaO)/w(SiO2)=2.6, the percentage of CaF2 in slag is 3~4 wt%, and the calculated w(MgO)/w(Al2O3)=0.7. In the actual production, the addition of chrome Ore, coke and flux is increased by 3%, 2% and 1%, respectively.

  • Material Balance Calculation of Chromium Ore Smelting Reduction and Direct Alloying Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The production process of stainless steel by Chromium Ore smelting reduction and direct alloying is an important and advanced way to raise the productivity of stainless steel, decrease the production cost, save electric energy and improve the economic profit. The material balance calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. It includes the actual oxygen consumption, furnace gas composition and occurrence amount, mass calculation of stainless steel crude melts and preparation of total material balance table. The absolute error of material balance is -2.859 kg and the relative error is -0.169%. The error is very small, so the material balance calculation can provide certain quantitative basis for determining reasonable design parameters and increasing smelting technology economic indicators.

  • Reduction Feature and Selection Principle of Chromium Ore for Stainless Steelmaking in a Smelting Reduction Converter
    Applied Mechanics and Materials, 2011
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    This paper starts with the mineral structure, reducing properties of Chromium Ore and the physical and chemical properties of Chromium oxide and discusses the requirements of the chemical composition of chromite and confirms the selection principle of Chromium Ore and reducing agent of Chromium Ore smelting reduction. The chemical compositions of the available chromite request the relatively high contents of Chromium and iron, the lower contents of Al2O3, MgO and P in gangue and the lower Cr/Fe ratio in keeping with the case of high Chromium. Chromoium Ore in South Africa is considered to be suitable for smelting stainless steel crude melts in a smelting reduction converter. From the reducing power and economy angle, carbon as a reducing agent is mOre suited to reducing Chromium Ore.

Yan Liu - One of the best experts on this subject based on the ideXlab platform.

  • Research on the Thermodynamics and Kinetics of Chromium Ore Smelting Reduction Process for Producing Stainless Steel
    Applied Mechanics and Materials, 2013
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    For describing and resolving the process of Chromium Ore smelting reduction preferably, the research status on the thermodynamics and kinetics of Chromium Ore smelting reduction process was summarized, based on the introduction of the process for smelting stainless steel with hot metal in a converter. The existing problems for smelting stainless steel by Chromium Ore smelting reduction in a converter were also discussed and some suggestions were made for the future work. A lot of investigations about the thermodynamics and the reduction mechanisms of Chromium Ore have been done. However, the consistent view about the thermodynamic feasibility and the mechanism of smelting reduction has not been achieved, so the application of research results is limited. Little work about the reaction kinetic model for the production of stainless steel by Chromium Ore smelting reduction and direct alloying has been done. So the synthetic kinetic model including a dissolution model and a reduction model of Chromium Ore should be built to predict and control accurately the process.

  • Heat Balance Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The heat balance calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. In the heat balance calculation, the heat consumption is calculated according to the actual reduction process in the converter and the thermal efficiency and the coefficient of thermal energy of smelting reduction converter are calculated. The calculation results show that the thermal efficiency η is 60.143% and the coefficient of thermal energy KT is 71.743%. The calculated relative error of heat balance is 0.019%. Heat balance calculation is an important part of the converter smelting process calculation, and it is extremely significant in the pursuit of the converter production of high quality and low energy consumption.

  • Mathematical Modeling of Refining of Stainless Steel in Smelting Reduction Converter Using Chromium Ore
    ISIJ International, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De-yong Wang
    Abstract:

    For predicting and controlling the process of Chromium Ore smelting reduction in a converter preferably, the coupling dynamic model is established for the first time based on the kinetic models of Chromium Ore dissolution and interfacial reducing reaction between the slag and the metal. It can decrease the refining time considerably and improve the production efficiency for producing 12 wt% Cr stainless steel crude melts in a converter when the initial hot metal contains the definite chrome metal at 1560°C. Under the conditions of the mathematical model, the effect of Chromium Ore size on the process of producing stainless steel crude melts by Chromium Ore smelting reduction in a converter is great when the particle size of Chromium Ore increases to a certain value. In such condition, the dissolution of Chromium Ore in the slag is the rate controlling step at a certain stage of refining and the rate of Chromium Ore smelting reduction is controlled jointly by the dissolution and the reduction of Chromium Ore. The effect of temperature on the process of Chromium Ore smelting reduction in a converter is significant. The mean reduction rate of Chromium Ore increases from 0.052 wt%·min–1 to 0.175 wt%·min–1 with the increasing of temperature from 1540°C to 1580°C.

  • A Coupling Dynamic Model for Dissolution and Reduction of Chromium Ore in a Smelting Reduction Converter
    Journal of Iron and Steel Research International, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De-yong Wang
    Abstract:

    For describing and resolving the process of Chromium Ore smelting reduction in a converter preferably, the coupling dynamic model was established based on the kinetic models of Chromium Ore dissolution and interfacial re- ducing reaction between the slag and metal. When 150 t stainless steel crude melts with Chromium of 12% are produced in a smelting reduction converter with no initial Chromium in metal at 1 560℃, the results of the coupling dynamic model show that the mean reduction rate and injection rate of Chromium Ore are 0. 091% ·min^-1 and 467 kg · min^-1 , respectively. The foundation of the coupling dynamic model provides a reference and basis on the constitution of rational processing route for a practical stainless steelmaking.

  • Mixture Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The mixture calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. The calculation results show that the required total consumption of chrome Ore, coke and limestone in the smelting reduction process is 224.942 kg, 154.9 kg and 99.223 kg, respectively, under the conditions of this calculation. The total amount of slag includes the amounts of hot metal elements oxidation into slag, lining erosion into slag and Chromium Ore, coke and adding flux into the slag, which is calculated respectively according to the basic raw data and the set values of process parameters. The slag component is confirmed, namely, the actual basicity w(CaO)/w(SiO2)=2.6, the percentage of CaF2 in slag is 3~4 wt%, and the calculated w(MgO)/w(Al2O3)=0.7. In the actual production, the addition of chrome Ore, coke and flux is increased by 3%, 2% and 1%, respectively.

Mao Fa Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Research on the Thermodynamics and Kinetics of Chromium Ore Smelting Reduction Process for Producing Stainless Steel
    Applied Mechanics and Materials, 2013
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    For describing and resolving the process of Chromium Ore smelting reduction preferably, the research status on the thermodynamics and kinetics of Chromium Ore smelting reduction process was summarized, based on the introduction of the process for smelting stainless steel with hot metal in a converter. The existing problems for smelting stainless steel by Chromium Ore smelting reduction in a converter were also discussed and some suggestions were made for the future work. A lot of investigations about the thermodynamics and the reduction mechanisms of Chromium Ore have been done. However, the consistent view about the thermodynamic feasibility and the mechanism of smelting reduction has not been achieved, so the application of research results is limited. Little work about the reaction kinetic model for the production of stainless steel by Chromium Ore smelting reduction and direct alloying has been done. So the synthetic kinetic model including a dissolution model and a reduction model of Chromium Ore should be built to predict and control accurately the process.

  • Heat Balance Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The heat balance calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. In the heat balance calculation, the heat consumption is calculated according to the actual reduction process in the converter and the thermal efficiency and the coefficient of thermal energy of smelting reduction converter are calculated. The calculation results show that the thermal efficiency η is 60.143% and the coefficient of thermal energy KT is 71.743%. The calculated relative error of heat balance is 0.019%. Heat balance calculation is an important part of the converter smelting process calculation, and it is extremely significant in the pursuit of the converter production of high quality and low energy consumption.

  • Mathematical Modeling of Refining of Stainless Steel in Smelting Reduction Converter Using Chromium Ore
    ISIJ International, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De-yong Wang
    Abstract:

    For predicting and controlling the process of Chromium Ore smelting reduction in a converter preferably, the coupling dynamic model is established for the first time based on the kinetic models of Chromium Ore dissolution and interfacial reducing reaction between the slag and the metal. It can decrease the refining time considerably and improve the production efficiency for producing 12 wt% Cr stainless steel crude melts in a converter when the initial hot metal contains the definite chrome metal at 1560°C. Under the conditions of the mathematical model, the effect of Chromium Ore size on the process of producing stainless steel crude melts by Chromium Ore smelting reduction in a converter is great when the particle size of Chromium Ore increases to a certain value. In such condition, the dissolution of Chromium Ore in the slag is the rate controlling step at a certain stage of refining and the rate of Chromium Ore smelting reduction is controlled jointly by the dissolution and the reduction of Chromium Ore. The effect of temperature on the process of Chromium Ore smelting reduction in a converter is significant. The mean reduction rate of Chromium Ore increases from 0.052 wt%·min–1 to 0.175 wt%·min–1 with the increasing of temperature from 1540°C to 1580°C.

  • A Coupling Dynamic Model for Dissolution and Reduction of Chromium Ore in a Smelting Reduction Converter
    Journal of Iron and Steel Research International, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De-yong Wang
    Abstract:

    For describing and resolving the process of Chromium Ore smelting reduction in a converter preferably, the coupling dynamic model was established based on the kinetic models of Chromium Ore dissolution and interfacial re- ducing reaction between the slag and metal. When 150 t stainless steel crude melts with Chromium of 12% are produced in a smelting reduction converter with no initial Chromium in metal at 1 560℃, the results of the coupling dynamic model show that the mean reduction rate and injection rate of Chromium Ore are 0. 091% ·min^-1 and 467 kg · min^-1 , respectively. The foundation of the coupling dynamic model provides a reference and basis on the constitution of rational processing route for a practical stainless steelmaking.

  • Mixture Calculation of Chromium Ore Smelting Reduction Process in a Converter
    Advanced Materials Research, 2012
    Co-Authors: Yan Liu, Mao Fa Jiang, De Yong Wang
    Abstract:

    The mixture calculation of producing stainless steel crude melts by Chromium Ore smelting reduction in a 150 t converter is carried out by use of the empirical data and the calculation method of refining plain carbon steel in a converter, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. The calculation results show that the required total consumption of chrome Ore, coke and limestone in the smelting reduction process is 224.942 kg, 154.9 kg and 99.223 kg, respectively, under the conditions of this calculation. The total amount of slag includes the amounts of hot metal elements oxidation into slag, lining erosion into slag and Chromium Ore, coke and adding flux into the slag, which is calculated respectively according to the basic raw data and the set values of process parameters. The slag component is confirmed, namely, the actual basicity w(CaO)/w(SiO2)=2.6, the percentage of CaF2 in slag is 3~4 wt%, and the calculated w(MgO)/w(Al2O3)=0.7. In the actual production, the addition of chrome Ore, coke and flux is increased by 3%, 2% and 1%, respectively.

Wang De-yong - One of the best experts on this subject based on the ideXlab platform.

  • Research Progress on Process of Stainless Steelmaking by Chromium Ore Smelting Reduction and Direct Alloying in a Converter
    2012
    Co-Authors: Wang De-yong
    Abstract:

    The study status of Chromium Ore smelting reduction process was summarized,based on the introduction of process technologies used for refining stainless steel with hot metal in converter.The existence problems of the study used for refining stainless steel by Chromium Ore smelting reduction and direct alloying in converter are also discussed.The main problems include that the behavior of Chromium Ore dissolution in the slag has rarely been reported,the consistent view about the mechanism of smelting reduction has not been achieved,the application of research results is limited and little work about the reaction kinetic model for the production of stainless steel by Chromium Ore smelting reduction and direct alloying has been done.Consequently,it is of very important strategic significance for the rapid development of stainless steel industry in our country and in the world to strengthen the study and generalization of Chromium Ore smelting reduction process for stainless steel in China and realize the industrialized production as soon as possible.

  • Thermodynamics of the Process of Stainless Steelmaking by Chromium Ore Smelting Reduction in a Converter
    Journal of Iron and Steel Research, 2011
    Co-Authors: Wang De-yong
    Abstract:

    Aiming at the process of Chromium Ore smelting reduction for stainless steelmaking in a converter,the theOretical analysis and calculations were carried out for the several important questions of the process in the view of metallurgical thermodynamics.A theOretic basis for the thermodynamic feasibility of steel composition readjustment by Chromium Ore direct alloying in a converter steelmaking process was afforded.The following results are obtained: ① According to the thermodynamic analysis,the Chromium Ore can be reduced in a smelting reduction converter.② The activity of Chromium in hot metal is raised by the incresement of the Chromium content in hot metal.The effect of temperature on the activity of Chromium is less.③ When the Chromium content in hot metal is less than 20%,the precipitation of chromic carbide in Fe-Cr-C melts with carbon saturation is impossible on the conditions of producing stainless steel crude melts by smelting reduction at 1500-1600℃.

  • Thermodynamic Analysis of Smelting Reduction and Direct Alloying Using Chromium Ore in Stainless Steel Smelting Process
    Journal of Iron and Steel Research, 2006
    Co-Authors: Wang De-yong
    Abstract:

    Aiming at the thermodynamic problems in the process of Chromium Ore smelting reduction and direct alloying for stainless steel,the theOretical analysis and calculations have been carried out by thermodynamic diagram and isothermal equation.A theOretic basis for the thermodynamic feasibility of steel composition readjustment by Chromium Ore direct alloying in converter steelmaking process was afforded.The results show that smelting reduction and direct alloying by Chromium Ore in the converter are feasible,and externally applied reducing agent is indispensable;the starting reduction temperature of Cr_2O_3 in molten slag seems to increase with the increase of Cr_2O_3 and the slag basicity;when Chromium oxide exists as CrO in the slag, the starting reduction temperature is lower than that of Cr_2O_3;the less the FeO content in molten slag,the lower the starting reduction temperature of Cr_2O_3.

Xu Li-xian - One of the best experts on this subject based on the ideXlab platform.

  • Dissolution Behavior of Chromium Ore in CaO-SiO_2-MgO-Al_2O_3 Slag System
    The Chinese Journal of Process Engineering, 2007
    Co-Authors: Xu Li-xian
    Abstract:

    The dissolution behavior of compact Chromium Ore with definite shape in CaO-SiO_2-MgO-Al_2O_3 slag system was studied, and the effect of different slag compositions on the dissolution amount and rate of Chromium Ore in slag was investigated.The dissolution mechanism of Chromium Ore in slag was also discussed.It was found that the dissolution rate of Chromium Ore in slag increased with slag basicity decreasing under the present experimental conditions.The dissolution amount and rate of Chromium Ore decreased with the increase of Al_2O_3 and MgO contents.In particular,they decreased with the former.Addition of CaF_2 to the initial slag increased the dissolution rate markedly.

  • Kinetic Model for Dissolution of Chromium Ore in CaO-SiO_2-MgO-Al_2O_3 Slag System
    Journal of Northeastern University, 2007
    Co-Authors: Xu Li-xian
    Abstract:

    To reveal in depth the smelting/reduction mechanism of Chromium Ore in converter,the dissolution rate of natural Chromium Ore in definite shape in CaO-SiO2-MgO-Al2O3 slag system was determined,and a kinetic model for its dissolution process was developed on macrokinetics theory.The results showed that the dissolution process of Chromium Ore is controlled by the surface dissolution reaction on conditions of the experiments we did,where the temperature has significant effect on the reaction rate constant of Chromium Ore dissolution.The calculated value of dissolution activation energy is 524.52 kJ/mol.The dissolution rate of Chromium Ore in slag increases with reaction temperature.