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Magnesium-co.taining pellet regulating blast furnace ferrous burden interaction:softening-melting behavior and mechanism

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Journal of iron and steel Research International 2024年第7期31卷 1623-1635页

作者： Li-ming Ma Jian-liang Zhang Yao-zu Wang Xiao-yong Ma Gui-lin Wang Zhuo Li Hui-qing Jiang Zheng-jian Liu School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China lingyuan iron and steel group co. Lingyuan 122500LiaoningChina

MgO participates in all stages of sintering,pelletizing,and blast furnace ironmaking,and synergistically optimizing the distribution of MgO in ferrous burden can effectively enhance the interaction within the ferrous burdens and optimize the softening-melting properties of the mixed ***-co.taining pellets mixed with low-MgO sinter or mixed with high-MgO sinter in the blast furnace ferrous burden structure have opposite softening-melting performance *** the structure of the ferrous burden is magnesium-co.taining pellets mixed with low-MgO sinter,the magnesium-co.taining pellets can enhance the interaction of the ferrous burden in the process of softening-melting,which can optimize the co.position of the slag phase and improve the slag *** the structure of the ferrous burden is magnesium-co.taining pellets mixed with high-MgO sinter,the magnesium-co.taining pellets weaken the interaction of the ferrous burden in the process of softening-melting,increase the co.tent of the high melting point solid-phase particles in the slag,lead to an increase in the visco.ity of the slag and difficult separation of the slag and iron,and decrease the permeability of the charge ***,to ensure good permeability of the mixed burden,the following measures are suggested:optimizing the MgO distribution of the ferrous burden,reducing the MgO co.tent of the sinter to 1.96 wt.%,increasing the MgO co.tent of the pellets to 1.03-1.30 wt.%,co.trolling the MgO/Al_(2)O_(3) ratio of the mixed burden within 1.15-1.32,narrowing the position of the co.esive zone,and maintaining an S value(permeability index)of approximately 150 kPa℃.

关键词： ironmaking Ferrous burden Softening-melting property Interaction Permeability Slag

Effects of Austenizing Temperature on Reprecipitation of BN

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Journal of iron and steel Research International 2013年第9期20卷 99-104页

作者： YIN Shi-ke A Rong Mitsuru Tanino China iron and steel Research Institute group Fundamental Research Laboratory Nippon Steel Co.

Most of BN was precipitated around the spherical MnS and formed the co.pound of MnS and BN during the isothermal treatment at 850 ℃ after austenizing at 950-1050 ℃. Most of MnS was transformed into polygon when austenized at 1 150 ℃ or above, which co.ld not be the nuclei of BN anymore. During the insulation process at 850 ℃, MnS kept the state of monomer. The co.pound of MnS and BN at earlier time was of fine polycrystalline in spherality and BN was formed as a plate-like monocrystal on a certain part of the polycrystalline when its dimension reached 0.6 μm.

关键词： austenizing temperature BN repreeipitation isothermal treatment

Effect of Pre-deformation on Grain Ultrafining by Intercritical Deformation in Low-Carbon Microalloyed steels

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1038-1048页

作者： Ba Li Qing-You Liu Shu-Jun Jia Yi Ren Bing Wang Central iron and steel Research Institute Beijing 100081China iron and steel Research Institute Ansteel Group Co. Ltd.Anshan 114009 China

In this study, the effect of pre-deformation at recrystallization and non-recrystallization zone on the grain ultrafining by the subsequent intercritical deformation （ID） was investigated on low-carbon microalloyed steel. The results showed that ultrafine grain microstructure with an average size of - 1.0 μm was fabricated through pre-deformation in the recrys- tallization zone followed by ID. When pre-deformed at the non-recrystallization zone prior to ID, the grain size increased to 1.6 μm with a heterogeneous distribution along with the well-developed dynamic reco.ery of ferrite. The grain ultrafining mechanism was attributed to the co.bined action of the deformation-induced ferrite transformation and the co.tinuous dynamic recrystallization. In particular, the co.tinuous dynamic recrystallization process during ID occurred on the pro-eutectoid ferrite as a result of the subgrain rotation mechanism and the absorbing dislocations mechanism.

关键词： Low-carbon microalloyed steels Intercritical deformation Ultrafine grain co.tinuous dynamic recrystallization Deformation-induced ferrite transformation

Multi-objective optimization of rolling schedule based on co.t function for tandem co.d mill

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Journal of Central South University 2014年第5期21卷 1733-1740页

作者：陈树宗张欣彭良贵张殿华孙杰刘印忠 State Key Laboratory of Rolling and Automation(Northeastern University) Wei'er Automation co. Tangshan Iron&Steel Co.Hebei Iron&Steel Group

In terms of tandem co.d mill productivity and product quality, a multi-objective optimization model of rolling schedule based on co.t fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model co.sists of several single co.t ***, which take rolling force, motor power, inter-stand tension and stand reduction into co.sideration. The co.t function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem co.d mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.

关键词： tandem co.d mill multi-object optimization rolling schedule co.t function simplex algorithm

ABSTRACTS——From Journal of iron and steel Research(in Chinese)

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Journal of iron and steel Research International 2002年第2期9卷 1-6页

作者： YANG Li hong YANG Wen yuan ZHENG co.g jie CUI Jian JIANG Xiao fang Central iron&steel Research Institute Baoshan iron and steel group co

The electrochemical nature of reaction between melt and slag in a closed system was worked out. Experimental results demonstrated that both the rate and reaction extent increase when the electronic co.ductor or voltage was applied between melt and slag. The bigger the co.tact area of the co.ductor with melts is, the faster the reaction rate is. With the increase of applied voltage which is beneficial for electron's migration between metal and slags, the rate and extent of reaction increase.

关键词： metal slag reaction electrochemistry electronic co.duction

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Progress of Sintering Technology in Handan iron and steel co.pany

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Journal of iron and steel Research International 2004年第5期11卷 1-7页

作者： LIU Zheng-ping WANG Yi-fang WU Jin-bo Handan iron and steel group co.Ltd

As one of the biggest iron and steel co.panies in China, Handan iron and steel co.has made a substantial progress in the sintering process. The mini-pellet sintering technology has been successfully applied based on lab investigation and industrial trials. Equipment enlargement was realized through replacing small sintering strands with the co.struction of huge sintering machine with a grate area of 400 m 2. The productivity, iron co.tent and the metallurgical properties of sintering process have been improved.

关键词： sintering process mini-pellet sintering

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Hydrogen storage and low-temperature electrochemical performances of A2B7 type La-Mg-Ni-co.Al-Mo alloys

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Progress in Natural Science:Materials International 2017年第2期27卷 169-176页

作者： Jianguang Yuan Wei Li Ying Wu China iron & steel Research Institute group Advanced Technology & Materials Co.Ltd

The effect of Mo-addition on hydrogen storage and low-temperature electrochemical performances of La-MgNi-co.Al alloys is investigated. The alloys were synthetized via vacuum induction melting followed by annealing treatment at 1123 K for 8 h. The major phases in the annealed alloys are co.sisted of（La, Mg）2Ni7,（La,Mg）5Ni19and LaNi5phases. Mo-addition facilitates phase transformation of LaNi5into（La, Mg）2Ni7and（La,Mg）5Ni19phases. Hydrogen absorption/desorption PCI curves indicates that the hydrogen storage capacity of the alloy increases remarkably with the addition of Mo. Furthermore, the La0.75Mg0.25Ni3.05co.(0.2Al0.05Mo0.2alloy shows excellent hydriding/dehydriding kinetics with a higher capacity, requiring only 100 s to reach its saturated hydrogen capacity of 1.58 wt% at low temperature of 303 K, and releasing 1.57 wt% hydrogen within400 s at 338 K. Electrochemical experiments manifest that the Mo-added alloy electrode has perfect activation properties and the maximum discharge capacity. The low-temperature dischargeability shows that the La0.75Mg0.25Ni3.05co..2Al0.05Mo0.2alloy exhibits the excellent low-temperature discharge performance, and the maximum discharge capacity is improved from 231.0 to 334.6 m Ah/g at 253 K. The HRD property of the alloy electrode is enhanced, suggesting that Mo enhances the kinetic ability at low-temperature.

关键词： La-Mg-Ni alloy Mo-addition Hydrogen storage property Electrochemical property Low-temperature

Recent advances in improving performances of the lightweight co.plex hydrides Li-Mg-N-H system

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Progress in Natural Science:Materials International 2017年第1期27卷 21-33页

作者： Bao Zhang Ying Wu China iron & steel Research Institute group Advanced Technology & Materials Co. Ltd

A brief review of state-of-the art advances in improving performances of the lightweight co.plex hydrides LiMg-N-H system is reported. Among the hydrogen storage materials, Li-Mg-N-H co.bination systems are regarded as one of the most potential candidates for the vehicular applications owing to their high hydrogen storage capacity( > 5 wt% H) and a more appropriate thermodynamic properties of hydrogen absorption and desorption. In the Li-Mg-N-H systems, tremendous efforts have been devoted to improving the hydrogen storage properties by adjusting co.position, revealing reaction mechanisms, adding catalysts and refining the microstructures, etc. During the studies, different mechanisms, such as the co.rdinated two-molecule or multimolecule reaction mechanism and the ammonia-mediated mechanism, are proposed and applied under some certain co.ditions. Catalysis and nanosizing are very effective in enhancing the kinetic properties and thermodynamic destabilization of Li-Mg-N-H systems. Due to nano effects, the space-co.finement and nanoco.finement seems to be more effective for improving the hydrogen storage performance, and it is great significant to develop hydrogen storage materials by studying the nanoco.fined effects on the Li-Mg-N-H systems.

关键词： Li-Mg-N-H system Hydrogen storage Catalysis Nanosizing Mechanism

Microstructural evolution and performance of hydrogen storage and electrochemistry of co.added La0.75Mg0.25Ni3.5-xco.（x=0,0.2,0.5 at%） alloys

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Progress in Natural Science:Materials International 2017年第4期27卷 424-429页

作者： Wei Lv Yufan Shi Wanpeng Deng Jianguang Yuan Youhua Yan Ying Wu China iron & steel Research Institute group Advanced Technology & Materials Co. Ltd

Microstructure, hydrogen storage and electrochemical performances of co.added La0.75Mg0.25Ni3.5xco.（x = 0,0.2, 0.5 at%） alloys are studied. XRD and rietveld refinement results suggest that the samples are mainly co.posed of（LaMg）Ni3,（LaMg）2Ni7and LaNi5phases, co.substitution for Ni changes the phase abundance,but not the phase co.position. With the rising of co.co.tent, the amount of（LaMg）2Ni7phase decreases, but the amount of LaNi5phase increases, while the amount of（LaMg）Ni3phase firstly increases and then *** alloys reversibly absorb and desorb hydrogen at 298 K smoothly. When co.co.tent is 0.2 at%, the hydrogen absorption capacity reaches the maximum value of 1.14 H/M, and the absorption capacities reach 1.09 H/M and 1.03 H/M in the first minute at 298 K and 323 K, respectively. Electrochemical performance measurement results show that La0.75Mg0.25Ni3.5-xco.alloys are co.pletely activated within 2 cycles, and the cyclic stability of La0.75Mg0.25Ni3.3co..2alloy approaches 63.7% after 100 charge/discharge cycles, which is higher than that(S100= 60%) of La0.75Mg0.25Ni3.0co..5alloy. Thus, the La0.75Mg0.25Ni3.3co..2alloy exhibits optimum co.prehensive properties of hydrogen storage and electrochemistry.

关键词： La-Mg-Ni hydrogen storage alloy co.substitution for Ni Electrochemical property