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Activity Model of Fe-Si-B Ternary Metallic Melts

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Journal of Iron and Steel Research International 2011年第6期18卷 16-21页

作者： zhao Ding-guo GUO pei-min zhao pei State Key Laboratory for Advanced Iron and Steel Processes and Materials Central Iron andSteel Research Institute Beijing 100081 China

According to the ion and molecule coexistence theory, the activity model of Fe-Si-B ternary system was es- tablished, and the influence of ratio ：Csi/XZe, boron content and temperature, etc. on the activity of the melt com- pound was investigated. The results show that the FeB activity is high in the liquid iron, when Xsl/XFo is 0. 5 ; the ac- tivity of boron increases with increasing the boron content for different contents of xe and xs, and the activity of boron at the ratio xFo = 0.4 is about one order of magnitude higher than that for the XFo = 0. 8; The activities of the melt compound were also affected by temperature, but the influencing extent was little. The equal activity diagrams of silicon and boron were drawn for the first time according to the model results.

关键词： activity metallic melt ion and molecule coexistence model equal activity diagram

Enhanced Crystallization Kinetics of PLLA by Ethoxycarbonyl Ionic Liquid Modified Graphene

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Chinese Journal of Polymer Science 2019年第3期37卷 243-252页

作者： pei Xu zhao-pei Cui Gang Ruan Yun-Sheng Ding Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Functional Materials and Devices Hefei University of Technology

To investigate the performance of graphene(Gra) modified with ethoxycarbonyl ionic liquid(IL), chain mobility and crystallization kinetics of poly(L-lactic acid)(PLLA), a series of PLLA nanocomposites have been prepared using solution-cast *** can improve the dispersion of Gra in PLLA matrix and the samples containing IL have higher growth rate of PLLA spherulite than neat PLLA does. PLLA/IL/Gra and PLLA/2 Gra exhibit the same relaxation strength and time of αN relaxation that corresponds to the longest normal mode motion at 110-140 °C. PLLA/IL/Gra shows a faster crystallization rate than PLLA/2 Gra does, which might be attributed to the Gra-imidazolium cation interaction in IL modified Gra, the significant dispersion effect of IL at Gra surface, and the increase of nuclei density of PLLA/IL/Gra.

关键词： Ionic liquid Graphene PLLA Crystallization Dielectric behavior

THE NONLINEAR MAGNETOELASTIC PROPERTIES OF <110> ORIENTED TB_(0.27)DY_(0.73)FE_(1.95) POLYCRYSTALLINE ALLOYS UNDER COUPLED MAGNETOMECHANICAL LOADING

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Acta Mechanica Solida Sinica 2013年第5期26卷 441-447页

作者： pei zhao Youhe Zhou Yirui Liang Key Laboratory of Mechanics on Environment and Disaster in Western China The Ministry of Education of China and Department of Mechanics and Engineering Sciences School of Civil Engineering and MechanicsLanzhou University

In the paper, the nonlinear magnetoelastic properties of composition Tb0.27Dy0.73 Fel.95 〈 110 〉 oriented polycrystalline alloys are investigated under coupled loads of high mag- netic field and compressive stress. The magnetization and magnetostriction are measured simul- taneously under applied magnetic field from -800 to 800 kA/m and compressive stress from 0 to 25 MPa at room temperature. The strain coefficient and relative permeability are obtained by differential calculation from the experimental curves. The results show that the values of satura- tion magnetization （M~） under different compressive stresses remain invariably constant in the region of the high magnetic field. The saturation magnetostriction （As） increases with increasing compressive stress and reaches 1680 ~ 10-6 under 25 MPa. According to the increase of the com- pressive stress, the hysteretic loop area of magnetization and magnetostriction increases, while the maximum relative permeability and strain coefficient decrease. Additionally, the influence of the bias magnetic field on the mechanical property is taken into account. The stress-strain relation- ship is nonlinear and sensitive to the applied external magnetic fields along the axis of rod. The results obtained are a useful complement to the existing experiments for theoretical approaches and engineering applications.

关键词： TbDyFe alloys magnetomechanical loading magnetization magnetostriction stress-strain relationship

Activity Model and Its Application in Quarternary System CaO-FeO-SiO_2-WO_3

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Journal of Iron and Steel Research International 2010年第1期17卷 12-17页

作者： GUO pei-min LI Zheng-bang zhao pei State Key Laboratory for Advanced Iron and Steel Processes and Materials Central Iron andSteel Research Institute Beijing 100081 China

The activity model of CaO-FeO-SiO2-WO3 quarternary system is built according to the coexistence theory of slag structure and the reduction thermodynamics of scheelite is discussed by using this model. The activities of SiO2 and WO3 decrease, while the activity of CaO increases with increasing the basicity of slag. Among SiC, carbon and silicon reactants, the reducing capability of SiC is the strongest, while that of carbon is the poorest at high temperature （about 1 873 K）. Increasing the content of silicon or carbon is beneficial for increasing the yield of tungsten. Oxidizability of slag has a significant effect on the yield of tungsten. Controlling basicity and oxidizability of slag can decrease the oxidation loss of tungsten.

关键词： activity model scheelite thermodynamics direct reduction

Industrial application prospects and key issues of the pure-hydrogen reduction process

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1922-1931页

作者： Lei Wang peimin Guo Lingbing Kong pei zhao State Key Laboratory of Advance Steel Process and Products Central Iron and Steel Research InstituteBeijing 100081China Cisri Sunward Technology Co. Ltd.Beijing 100081China

The industrial application prospect and key issues in basic theory and application are discussed by the methods of theoretical analysis and calculation to promote the development of the pure-hydrogen reduction *** to the discussion of thermodynamics and kinetics of pure-hydrogen reduction reaction,the reduction reaction of iron oxide by pure hydrogen is an endothermic reaction,and the reaction rate of hydrogen reduction is significantly faster than that of carbon *** explore the feasibility of the industrial applications of pure-hydrogen reduction,we design the hydrogen reduction reactor and process with reference to the industrialized hydrogen-rich reduction process and put forward the methods of appropriately increasing the reduction temperature,pressure,and temperature of iron ore into the furnace to accelerate the reaction rate and promote the reduction of iron *** key technical parameters in engineering applications,such as hydrogen consumption,circulating gas volume,and heat balance,are discussed by theoretical calculations,and the optimized parameter values are *** process parameters,cost,advantages,and disadvantages of various current hydrogen production methods are compared,and the results show that hydrogen production by natural gas reforming has a good development *** the discussion of the corrosion mechanism of high-temperature and high-pressure hydrogen on heat-resistant steel materials and the corrosion mechanism of H_2S in the hydrogen gas on steel,the technical ideas of developing new metal temperature-resistant materials,metal coating materials,and controlling gas composition are put forward to provide guidance for the selection of heater and reactor ***,the key factors affecting the smooth operation of the hydrogen reduction process in engineering applications are analyzed,offering a reference for the industrial application of the purehydrogen reduction process.

关键词： pure hydrogen reduction process design engineering application reactor material sulfur and nitrogen balance

Reduction of 1-3 mm Iron Ore by CO on Fluidized Bed

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Journal of Iron and Steel Research International 2011年第3期18卷 1-5页

作者： PANG Jian-ming GUO pei-min zhao pei The State Key Laboratory for Advanced Steel Processes and Products Central Iron and Steel Research InstituteBeijing 100081China

The reduction-degree of the sample increases and the utilization ratio of gas decreases when the reaction lasts longer time,which indicates that the reaction is faster at the beginning of reduction,while it becomes slower in subsequent *** higher the reaction temperature,the higher the utilization ratio of gas and the reduction-degree are,but the difference of utilization ratio among the different temperatures becomes smaller with *** utilization ratio of gas can reach about 8% and the reduction-degree is 80% for 20 min reduction at 850 ℃,indicating that the reduction reaction by CO is very fast at high *** higher the reaction temperature,the higher the apparent reaction rate constant is,but the difference of apparent reaction rate constant among the different temperatures becomes *** apparent activation energy is about 59.11 kJ/mol in the fluidized bed *** increase of reduction-degree with gas velocity shows quite good linearity,indicating that at high temperature even higher velocity of reducing gas can be used to improve the productivity of reactor when CO is used as reducing *** the increase of charge height,the metallization ratio and the reduction-degree decrease,but the utilization ratio of gas increases.

关键词： CO fluidized bed fine powder iron ore reduction-degree

Reduction Kinetics of Fine Iron Ore Powder in Mixtures of H_2-N_2 and H_2-H_2O-N_2 of Fluidized Bed

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Journal of Iron and Steel Research International 2015年第5期22卷 391-395页

作者： Jian-ming PANG pei-min GUO pei zhao Center of Efficient Utilization of Resources by Low-temperature Metallurgy China Iron and Steel Research Institute Group

Reduction kinetics of fine iron ore powder in different gas mixtures were investigated in high-temperature fluidized bed at a scale of kilograms. Influence of processing parameters, such as particle size, gas flow velocity, height of charge, temperature, compositions of gas mixture, and percentage of inert components, on reduction ki- netics was experimentally determined under the condition of fluidization. The equations for calculating instantaneous and average oxidation rates were deduced. It was found that an increasing H2 O percentage in the gas mixture could obviously decrease the reduction rate because the equilibrium partial pressure of H2 decreased with increasing content of Hz O in the gas mixture and then the driving force of reduction reaction was reduced. When the H2 content was high, .the apparent reaction rate was so rapid when the average size of iron ore fines was less than 1 mm that the re- action temperature can be as low as 750 ℃ ; when the average size of iron ore fines was more than 1 mm, a high re- action temperature of 800 ℃ was required. In addition, it was also found that the content of H2O should be less than 10% for efficient reduction.

关键词： hydrogen fluidized bed fine iron ore powder reduction kinetics

Evolution and control of nonmetallic inclusions in FeSiB alloy

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Journal of Iron and Steel Research International 2020年第5期27卷 588-597页

作者： Bai-song Li Wen-zhi Chen Yu-lin zhao pei zhao Central Iron and Steel Research Institute Beijing 100081China Advanced Technology and Materials Co. Ltd.China Iron and Steel Research Institute GroupBeijing 100081China

Inclusions have a great infuence on the quality of FeSiB amorphous *** evolution behavior of inclusions was *** results show that the spherical and elliptical inclusions,consisting of Al2O3 and SiO2,mainly come from industrial pure *** inclusions of 20-30μm in pure iron were removed by foatation during the smelting process,and spherical inclusions of 1-3μm combined with deoxidized products in FeSiB melt form Al2O3·SiO2 and CaO·Al2O3·SiO2 *** inclusions accumulated on the inner wall of the nozzle during the spraying process,and others fowed out of the nozzle and remained in FeSiB amorphous *** controlling the total oxygen content in industrial pure iron to 31×10^-6,clogging on the inner wall of the nozzle can be reduced and the free surface smoothness of the amorphous ribbon can be improved.

关键词： FeSiB alloy Nonmetallic inclusion Thermodynamics Nozzle clogging

Reduction of 1-3 mm iron ore by H_2 in a fluidized bed

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 620-625页

作者： Jian-ming Pang pei-min Guo pei zhao Chao-zhen Cao Ding-guo zhao Duo-gang Wang The State Key Laboratory for Advanced Steel Processes and Materials Central Iron and Steel Research Institute Beijing 100081 China

The reduction of 1-3 mm fine powder of iron ore by H2 was conducted in a lab-fabricated kg class high temperature fluidized bed. The results show that the differential pressure in the fluidized bed, which has small fluctuation with time, increases with the increase of gas flowing velocity. The utilization ratio of gas decreases when the reaction lasts longer time indicating that the reaction is faster at the beginning of reduction and becomes slower in the latter process. The higher the reaction temperature is, the higher the utilization ratio of gas is, but the difference of utilization ratio among the different temperatures becomes smaller with time. The utilization ratio of gas and the metallization ratio can reach 9% and 84% respectively at 750℃ for 20 min, which shows the reduction reaction by H2 is very fast. The increase of metallization ratio with gas velocity performs quite good linearity, which shows that a higher velocity of reducing gas can be used to improve the productivity of the reactor when H2 is used as reducing gas. With the increase of charge height, the metallization ratio decreases, but the utilization ratio of gas increases. The reaction temperature can be reduced to 700-750℃ from 800-850℃ when H2 is used as reducing gas.

关键词： hydrogen fluidized bed fine powder iron ore ironmaking reduction reaction