The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Hong Xin - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study on Reduction of Stainless Steel-making Slag with CO and H_2 at Intermediate-low Temperatures and Its Magnetic Separation
The Chinese Journal of Process Engineering, 2013Co-Authors: Hong XinAbstract:Pre-reduction of stainless steel-making slag was studied in a newly designed moving bed reactor with inclined tube and intermittent vibrators. The mixed gas of H2 and CO was used to simulate the exhaust gas produced and reformed in Iron Bath end reduction furnace to explore the possibility of preliminary separation of useful metals from stainless steel slag at intermediate and low temperatures by solid state reduction magnetic separation. And the toxicity leaching experiment of stainless steel slag after treatment was carried out. The results show that higher productivity of magnetic product (10.53%), total Iron grade (49.33%) and recovery rate of Fe (98.2%) can be obtained under the conditions of magnetic field strength at 200 mT, vibration intermittent 1:2, temperature 700～750℃ and CO/H2 volume ratio 1:4. The total amount of oxide impurities in the magnetic material after the treatment, such as CaO, MgO, Al2O3 , SiO2 , decreases significantly, from 80% to below 40%. And the tailings can meet the national emission standards.
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Experimental Study on Reduction of Cr-containing Materials in Iron Bath with C and H_2
The Chinese Journal of Process Engineering, 2013Co-Authors: Hong XinAbstract:Low-grade chromium ore and stainless steelmaking dust were reduced with carbon in Iron Bath, H2 was also used as reductant. The results showed that under an appropriate reducing condition, the Cr-containing materials were reduced effectively. The Cr recovery rate up to 97% was obtained while the Cr2O3 content in the end-slag kept below 0.1%. Furthermore, H2 blown through the bottom accelerated the reaction.
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Experimental investigation on the optimal carbon/hydrogen ratio for developing an Iron Bath reactor with H 2 -C mixture reduction-II
Revue de Métallurgie, 2012Co-Authors: Guo Jie, Zhang Huaiwei, Mao Jiajun, Li Qiuju, Wang Dongyan, Hong XinAbstract:The basic idea of H 2 -C mixture reduction reflects the advantages of hydrogen for fast reaction and low heat absorption in a smelting reduction reactor where hydrogen is used as the main reducing agent and carbon as the main heat generator on purpose to cut down the total energy consumption and CO 2 emission. This work aimed at the experimental investigation of the optimal carbon/hydrogen ratio, a key parameter of Iron oxide reduction with mixture reductive agents of carbon and hydrogen. Experiments were carried out using a pure Al 2 O 3 crucible which was placed in a tubular furnace for high temperature. Two investigation methods were adopted: one was injecting an acetylene/hydrogen mixture reducing gas into molten Iron oxides, and the other was blowing hydrogen into an Iron Bath during continuous feeding of fine ore mixing solid carbon. Parameters such as the apparent de-oxidation rate and utilization ratio of reductive agents were calculated from content analysis of the exhaust gas after dust removal and drying. In the experiments the highest total de-oxidation rate and satisfactory apparent utilization ratio of hydrogen were obtained under conditions with temperatures of 1823 K and the carbon/hydrogen ratio in the region of 0.5:1 to 1:1.
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Experimental Investigation on Optimal Carbon/Hydrogen Ratio for Developing Iron Bath Reactor with H2–C Mixture Reduction
steel research international, 2012Co-Authors: Guo Jie, Zhang Huaiwei, Mao Jiajun, Li Qiuju, Wang Dongyan, Hong XinAbstract:The basic idea of H2–C mixture reduction reflects advantages of hydrogen for fast reaction and low heat absorption in smelting reduction reactor, where hydrogen is used as main reducing agent and carbon as main heat generator on purpose to cut down total energy consumption and CO2 emission. This article aimed at the experimental investigation of optimal carbon/hydrogen ratio, a key parameter of Iron oxide reduction with mixture reductive agents of carbon and hydrogen. Experiments were carried out using a pure Al2O3 crucible which was placed in a tubular furnace for high temperature. Two investigation methods were adopted, one was injecting acetylene/hydrogen mixture reducing gas into molten Iron oxides and another was blowing hydrogen into Iron Bath during continuous feeding fine ore mixing solid carbon dust. Parameters such as apparent de-oxidation rate and utilization ratio of reductive agents were calculated from content analysis of exhaust gas after dust removing and drying. In experiments highest total de-oxidation rate and satisfied apparent utilization ratio of hydrogen were obtained under conditions with temperatures of 1823 K and carbon/hydrogen ratio in region from 0.5:1 to 2:1.
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Allotment Behavior of Chromium between Iron Melt and Molten Slag in Melting Reduction of Stainless Steel Slag
Nonferrous Metals, 2011Co-Authors: Hong XinAbstract:The effects of reaction temperature,slag basicity,Al2O3 content and initial Cr content in Bath on allotment behavior of chromite between Iron melt and molten slag were studied through orthogonal experiments for melting reduction of stainless slag.The experiments were carried out in a furnace with graphite crucible employing carbon saturated dissolved in liquid Iron as a reducing agent.The results showed that slag basicity was the primary factor for chromium reduction,which was followed by Al2O3 content in slag,initial Cr content in Iron Bath and reaction temperature.Besides,Pattern-Recognition-Method was applied for classification analog and optimization of the experimental samples,from which better reduction parameters of chromium oxide in slag was obtained.
Xin Hong - One of the best experts on this subject based on the ideXlab platform.
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Cr and Ni Recovery and Oxidational Dephosphorization of Stainless Steel Dust during the Iron-Bath Smelting Reduction Process
Advanced Materials Research, 2014Co-Authors: Shuai Niu, Yong Ren, Hua Zhang, Xin HongAbstract:According to the comprehensive utilization of 300 series and 400 series stainless steel dust (SSD), and the dephosphorization of the reclaimed Cr-Ni contained hot metal, an experimental method of smelting reduction in Iron-Bath and oxidational dephosphorization was studied. The result shows: The yield rate of Cr in 300 SSD and 400 SSD is 98.13% and 98.39% respectively, the yield rate of Ni is almost 100%; During the dephosphorization, through the BaO and CaO-BaO based dephosphorizer has a higher Dephosphorization rate, it can bring pollution problems and the cost is too high, however, under some circumstance when the requirement of phosphorus content is not critical, the CaO based dephosphorizer can also achieved the dephosphorization goal.
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6th International Symposium on High-Temperature Metallurgical Processing - Experimental Investigation on Reduction Kinetics of Stainless Steel‐Making Slag in Iron Bath Smelting Reduction
Advanced Materials Research, 2013Co-Authors: Bo Zhang, Jienan Liu, Yanfeng Yang, Luming Liu, Jiechao Liu, Lijian Luo, Xin HongAbstract:Reduction kinetics of stainless steel slag in Iron Bath smelting reduction was studied at the temperature of 1500°C ∼ 1650°C. It was concluded that the reduction process consisted of two parts. That is to say smelting reduction was controlled by stainless steel slag melting initially and by interface reaction later. In order to increase smelting reaction rate, the melting point of slag should be decreased at the first stage and adjust the liquidity of slag at later stage. Smelting reaction rate will be accelerated by means of optimize the slag content. The optimal reduction result that all most all of the chromium in slag been recovered was obtained in temperature was 1500°C, basicity of slag was 1.0∼1.2, the value of Al2O3+MgO was 25%.
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Experimental Investigation on Reduction Kinetics of Stainless Steel-Making Slag in Iron Bath Smelting Reduction
Advanced Materials Research, 2013Co-Authors: Bo Zhang, Shuai Niu, Wen Bin Chen, Fa Tao Chen, Li Sheng Liang, Xin HongAbstract:Reduction kinetics of stainless steel slag in Iron Bath smelting reduction was studied at the temperature of 1500°C ~ 1650°C. It was concluded that the reduction process consisted of two parts. That is to say smelting reduction was controlled by stainless steel slag melting initially and by interface reaction later. In order to increase smelting reaction rate, the melting point of slag should be decreased at the first stage and adjust the liquidity of slag at later stage. Smelting reaction rate will be accelerated by means of optimize the slag content. The optimal reduction result that all most all of the chromium in slag been recovered was obtained in temperature was 1500°C, basicity of slag was 1.0~1.2, the value of Al2O3+MgO was 25%.
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Balance modeling study for Iron Bath reactor with H 2 -C mixture reduction
2011 International Conference on Remote Sensing Environment and Transportation Engineering, 2011Co-Authors: Bo Zhang, Xin Hong, Huai-wei Zhang, Jie Guo, Jia-jun Mao, Zeng-li Liao, Dong-yan WangAbstract:The basic idea of H 2 -C mixture reduction reflexes using hydrogen as main reductant and carbon as main heat generator in Iron Bath smelt reduction reactors on purpose to cut down total energy consumption and CO 2 emission, protect the envIronment and take advantage of the new energy source. First of all, the calculation of mass and energy balance is very important for the smelt production, optimization of smelt proceeding and computer automation control. The author of this paper applied the methods of modeling for mass balance and energy balance after brief description of the reactor to research the balance behavior of this new metallurgical reactor. The balance model is compiled by Visual B include brief control panel and flex changeable parameter which can be used to simulate the different new smelt proceedings according to the input parameters and the changes of the material compositions. The work of this paper is one of bases for further kinetics model of Iron Bath reactor with H 2 -C mixture reduction in way of research and development.
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5th International Symposium on High-Temperature Metallurgical Processing - Mathematical Modeling for Developing Iron Bath Reactor with H2‐C Mixture Reduction
Advanced Materials Research, 2011Co-Authors: Bo Zhang, Huai-wei Zhang, Jie Guo, Jia-jun Mao, Zeng-li Liao, Xin HongAbstract:The basic idea of H2-C mixture reduction reflexes using hydrogen as main reductor and carbon as main heat generator in Iron Bath smelt reduction reactors on purpose to cut down total energy consumption and CO2 emission. The author applied the methods of modeling for separating regions and [1]complex integration to research the kinetics behavior of the reactor. Changes of temperature and concentration field in each region were calculated after modeling from theories for solid-liquid, solid-gas and gas-liquid reactions combining theories of shrinking core, combustion and deoxidization etc. Besides some boundary- and initial conditions were got from inlet variables, other conditions included substance and energy exchanges on boundaries between different reaction regions were determined from the translation of all boundary coordination. After dispersion treatment with Control-Volume-Method, the whole model was programmed into special software for digital simulation. Corresponding author: HONG Xin, Shanghai University, Phone/Fax: 021-56331176, E-mail: xhong@online.sh.cn
Liuyi Zhang - One of the best experts on this subject based on the ideXlab platform.
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modelling on melting of sponge Iron particles in Iron Bath
Steel Research, 1996Co-Authors: Liuyi ZhangAbstract:In this work the melting process of sponge Iron particles in Iron-Bath is mathematically modelled. Based on the fact that the heat conductivity of sponge Iron is much smaller than that of dense Iron, a simplified analytical solution for the system has been derived. This solution agrees very well with the exact one from numerical calculation. The melting time and melting course of sponge Iron particles are calculated. The melting time depends mostly on the particle radius. The amount of un-molten substance in the Iron-Bath at continuous feeding of sponge Iron is estimated. The results show that under smelting reduction conditions the melting runs fast and must not be the rate determining step of the whole process.
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Modelling on melting of sponge Iron particles in Iron‐Bath
Steel Research, 1996Co-Authors: Liuyi ZhangAbstract:In this work the melting process of sponge Iron particles in Iron-Bath is mathematically modelled. Based on the fact that the heat conductivity of sponge Iron is much smaller than that of dense Iron, a simplified analytical solution for the system has been derived. This solution agrees very well with the exact one from numerical calculation. The melting time and melting course of sponge Iron particles are calculated. The melting time depends mostly on the particle radius. The amount of un-molten substance in the Iron-Bath at continuous feeding of sponge Iron is estimated. The results show that under smelting reduction conditions the melting runs fast and must not be the rate determining step of the whole process.
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A model of post-combustion in Iron-Bath reactors. III: Theoretical basis for post-combustion with pre-heated air
Steel Research, 1993Co-Authors: Liuyi Zhang, Franz OetersAbstract:This paper describes the post-combustion of carbon monoxide with pre-heated air, heat transfer from gas to melt via a mixture of metal and slag droplets, the microkinetics of reoxidation of metal droplets in the gas consisting of CO 2 , CO and N 2 , and the total heat and mass balance in the gas space and in the Iron-Bath. The computer program presented here is flexible and can simulate various process modes of Iron-Bath reactors. The production rate of the reactor and the carbon consumption can be calculated herewith
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A model of post-combustion in Iron-Bath reactors, part 4: results for post-combustion with preheated air
Steel Research, 1993Co-Authors: Liuyi Zhang, Franz OetersAbstract:This paper describes calculated results of post-combustion with pre-heated air, heat transfer from gas to the melt via a mixture of metal and slag droplets, reoxidation at the metal droplets, CO evolution rate from the melt, production rate of the reactor, and carbon consumption of various process modes of a 15-t reactor with or without oxygen blowing through the vessel bottom. Using pre-heated air, the achievable post-combustion degree is higher than using pure oxygen. Nevertheless, slag droplets as heat carrier are necessary. With 50% slag droplets the real post-combustion degree can be higher than 45%. With 90% slag droplets it can be even higher than 80%. The operating point of the reactor is discussed
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A model of post-combustion in Iron-Bath reactors, part 1: theoretical basis
Steel Research, 1991Co-Authors: Liuyi Zhang, Franz OetersAbstract:The paper describes heat and mass balances, thermodynamic equilibria, and kinetics of the post-combustion reaction in Iron-Bath reactors and of the subsequent transfer of heat from gas to melt via metal and slag droplets suspended by the melt into the gas space above the met. Heat and mass balances, equilibria, and kinetcs of the reoxidation reaction of droplets, which accompanies the transfer of heat, are also described. Finally, the dynamics of droplet behaviour are presented
Bo Zhang - One of the best experts on this subject based on the ideXlab platform.
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6th International Symposium on High-Temperature Metallurgical Processing - Experimental Investigation on Reduction Kinetics of Stainless Steel‐Making Slag in Iron Bath Smelting Reduction
Advanced Materials Research, 2013Co-Authors: Bo Zhang, Jienan Liu, Yanfeng Yang, Luming Liu, Jiechao Liu, Lijian Luo, Xin HongAbstract:Reduction kinetics of stainless steel slag in Iron Bath smelting reduction was studied at the temperature of 1500°C ∼ 1650°C. It was concluded that the reduction process consisted of two parts. That is to say smelting reduction was controlled by stainless steel slag melting initially and by interface reaction later. In order to increase smelting reaction rate, the melting point of slag should be decreased at the first stage and adjust the liquidity of slag at later stage. Smelting reaction rate will be accelerated by means of optimize the slag content. The optimal reduction result that all most all of the chromium in slag been recovered was obtained in temperature was 1500°C, basicity of slag was 1.0∼1.2, the value of Al2O3+MgO was 25%.
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Experimental Investigation on Reduction Kinetics of Stainless Steel-Making Slag in Iron Bath Smelting Reduction
Advanced Materials Research, 2013Co-Authors: Bo Zhang, Shuai Niu, Wen Bin Chen, Fa Tao Chen, Li Sheng Liang, Xin HongAbstract:Reduction kinetics of stainless steel slag in Iron Bath smelting reduction was studied at the temperature of 1500°C ~ 1650°C. It was concluded that the reduction process consisted of two parts. That is to say smelting reduction was controlled by stainless steel slag melting initially and by interface reaction later. In order to increase smelting reaction rate, the melting point of slag should be decreased at the first stage and adjust the liquidity of slag at later stage. Smelting reaction rate will be accelerated by means of optimize the slag content. The optimal reduction result that all most all of the chromium in slag been recovered was obtained in temperature was 1500°C, basicity of slag was 1.0~1.2, the value of Al2O3+MgO was 25%.
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Balance modeling study for Iron Bath reactor with H 2 -C mixture reduction
2011 International Conference on Remote Sensing Environment and Transportation Engineering, 2011Co-Authors: Bo Zhang, Xin Hong, Huai-wei Zhang, Jie Guo, Jia-jun Mao, Zeng-li Liao, Dong-yan WangAbstract:The basic idea of H 2 -C mixture reduction reflexes using hydrogen as main reductant and carbon as main heat generator in Iron Bath smelt reduction reactors on purpose to cut down total energy consumption and CO 2 emission, protect the envIronment and take advantage of the new energy source. First of all, the calculation of mass and energy balance is very important for the smelt production, optimization of smelt proceeding and computer automation control. The author of this paper applied the methods of modeling for mass balance and energy balance after brief description of the reactor to research the balance behavior of this new metallurgical reactor. The balance model is compiled by Visual B include brief control panel and flex changeable parameter which can be used to simulate the different new smelt proceedings according to the input parameters and the changes of the material compositions. The work of this paper is one of bases for further kinetics model of Iron Bath reactor with H 2 -C mixture reduction in way of research and development.
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5th International Symposium on High-Temperature Metallurgical Processing - Mathematical Modeling for Developing Iron Bath Reactor with H2‐C Mixture Reduction
Advanced Materials Research, 2011Co-Authors: Bo Zhang, Huai-wei Zhang, Jie Guo, Jia-jun Mao, Zeng-li Liao, Xin HongAbstract:The basic idea of H2-C mixture reduction reflexes using hydrogen as main reductor and carbon as main heat generator in Iron Bath smelt reduction reactors on purpose to cut down total energy consumption and CO2 emission. The author applied the methods of modeling for separating regions and [1]complex integration to research the kinetics behavior of the reactor. Changes of temperature and concentration field in each region were calculated after modeling from theories for solid-liquid, solid-gas and gas-liquid reactions combining theories of shrinking core, combustion and deoxidization etc. Besides some boundary- and initial conditions were got from inlet variables, other conditions included substance and energy exchanges on boundaries between different reaction regions were determined from the translation of all boundary coordination. After dispersion treatment with Control-Volume-Method, the whole model was programmed into special software for digital simulation. Corresponding author: HONG Xin, Shanghai University, Phone/Fax: 021-56331176, E-mail: xhong@online.sh.cn
J. Wen - One of the best experts on this subject based on the ideXlab platform.
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Distribution of heavy metals from Iron Bath‐melting separation process applied to municipal solid waste incineration fly ash
Environmental technology, 2009Co-Authors: C.m. Wei, Qingcai Liu, J. WenAbstract:Fly ash generated from municipal solid waste (MSW) incineration is frequently classified as hazardous material and requires special disposal. The management of the large amount of fly ash has caused increasing problems in China. This work describes a novel approach for melting MSW incineration fly ash, and the distribution of heavy metals was characterized during the Iron Bath-melting separation process. Four hundred grams of pelletized fly ash was fed into the furnace in molten Iron Bath atmosphere. After the melting separation process, the distribution of heavy metals in samples and the leaching characteristics of the slag were investigated. The results indicated that Iron Bath-melting promoted the transfer of Cr, Mn and Cu from the slag phase to the Iron phase, which also improved Zn and Pb volatilization. The leaching concentrations, determined by the Chinese Standard Method (rollover leaching procedure) of the target metals of the slag from leaching tests were lower than the Chinese regulatory thresholds. Therefore, this method was proposed as an envIronmentally friendly technology to achieve a satisfactory solution for MSW incineration fly ash management.
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distribution of heavy metals from Iron Bath melting separation process applied to municipal solid waste incineration fly ash
Environmental Technology, 2009Co-Authors: C.m. Wei, Qingcai Liu, J. WenAbstract:Fly ash generated from municipal solid waste (MSW) incineration is frequently classified as hazardous material and requires special disposal. The management of the large amount of fly ash has caused increasing problems in China. This work describes a novel approach for melting MSW incineration fly ash, and the distribution of heavy metals was characterized during the Iron Bath-melting separation process. Four hundred grams of pelletized fly ash was fed into the furnace in molten Iron Bath atmosphere. After the melting separation process, the distribution of heavy metals in samples and the leaching characteristics of the slag were investigated. The results indicated that Iron Bath-melting promoted the transfer of Cr, Mn and Cu from the slag phase to the Iron phase, which also improved Zn and Pb volatilization. The leaching concentrations, determined by the Chinese Standard Method (rollover leaching procedure) of the target metals of the slag from leaching tests were lower than the Chinese regulatory thresholds. Therefore, this method was proposed as an envIronmentally friendly technology to achieve a satisfactory solution for MSW incineration fly ash management.
