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Non-isothermal reduction process analysis of iron-bearing burden with charging iron coke hot briquette under simulated blast furnace conditions

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Journal of Iron and Steel Research(International) 2022年第5期29卷 741-750页

作者： Hong-tao Wang Man-sheng Chu Ji-wei Bao Zheng-gen Liu Hong-ming Long School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina State key laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina key laboratory of metallurgical Emission Reduction&resources recycling Anhui University of TechnologyMinistry of EducationMa’anshan243032AnhuiChina

Highly reactive iron coke hot briquette(ICHB)prepared by carbonizing the agglomerate of iron-bearing substance and blended coals is regarded as an alternative fuel to mitigate carbon emission and energy consumption of blast ***,the reduction process of iron-bearing burden is extremely crucial for blast furnace *** effects of ICHB on the non-isothermal reduction process of iron-bearing burden with different reduction properties were thus experimentally studied under the conditions of simulated blast furnace lump zone(below 1100°C),and the related mechanism was discussed and *** results showed that the non-isothermal reduction process of iron-bearing burden is promoted by adding *** the charging ratio of ICHB is increased from 0%to 30%,the reduction degree of pellet is increased from 22.91%to 36.62%,but the increased amplitude is leveled ***,the reduction degree of sinter is raised from 35.10%to 93.33%.It is also indicated that the promotion effect of ICHB on the non-isothermal reduction of iron-bearing burden depends on the reduction property of *** with the burden with poor reduction performance(such as pellet 1),the promotion is more significant for the burden with good reduction property(such as sinter 1)since the reduction reaction of iron oxide in iron-bearing burden and the gasification of carbon in ICHB are remarkably reinforced each *** practical application of ICHB in blast furnace should be utilized with highly reductive iron-bearing burden.

关键词： Iron coke hot briquette Non-isothermal reduction Iron-bearing burden Low carbon emission Blast furnace

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Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium–titanium magnetite pellets

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International Journal of Minerals,Metallurgy and Materials 2017年第11期24卷 1228-1240页

作者： Gong-jin Cheng Zi-xian Gao He Yang Xiang-xin Xue School of Metallurgy Northeastern University Shenyang 110819 China liaoning key laboratory of recycling science for metallurgical resources Shenyang 110819 China

The effect of diboron trioxide(B_2O_3) on the crushing strength and smelting mechanism of high-chromium vanadium–titanium magnetite pellets was investigated in this work. The main characterization methods were X-ray fluorescence, inductively coupled plasma–atomic emission spectroscopy, mercury injection porosimetry, X-ray diffraction, metallographic microscopy, and scanning electron microscopy–energy-dispersive X-ray spectroscopy. The results showed that the crushing strength increased greatly with increasing B_2O_3 content and that the increase in crushing strength was strongly correlated with a decrease in porosity, the formation of liquid phases, and the growth and recrystallization consolidation of hematite crystalline grains. The smelting properties were measured under simulated blast furnace conditions; the results showed that the smelting properties within a certain B_2O_3 content range were improved and optimized except in the softening stage. The valuable element B was easily transformed to the slag, and this phenomenon became increasingly evident with increasing B_2O_3 content. The formation of Ti(C,N) was mostly avoided, and the slag and melted iron were separated well during smelting with the addition of B_2O_3. The size increase of the melted iron was consistent with the gradual optimization of the dripping characteristics with increasing B_2O_3 content.

关键词： high-chromium vanadium–titanium magnetite pellets diboron trioxide crushing strength smelting mechanism

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A superior strength-ductility synergy of Al_(0.1)CrFeCoNi high-entropy alloy with fully recrystallized ultrafine grains and annealing twins

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Journal of Materials science & Technology 2022年第36期131卷 185-194页

作者： Jiahao Li Kejie Lu Xiaojun Zhao Xinkai Ma Fuguo Li Hongbo Pan Jieming Chen key laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenzhen Institute of Southwest Jiaotong University Shenzhen 518000China State key laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Anhui province key laboratory of metallurgical Engineering&resources recycling(Anhui University of Technology) 243002 MaanshanChina Luoyang Ship Material Research Institute Luoyang 471023China

Grain refinement usually makes the materials stronger,while ductility has a dramatic ***,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time *** microstructure characterization using electron backscattered scattering diffraction demonstrates that abundant geometrically necessary dislocations(GNDs)gather around the grain boundaries and twin boundaries after tensile *** coarse-grained(CG)samples undergo a larger plastic deformation than UFG samples,the GND density decreases with grain size ranging from UFG to *** electron microscopy results reveal that the annealing twin boundary,which effectively hinders the dislocation slip and stores dislocation in grain interior,and the activation of multiple deformation twins are responsible for the superior strength–ductility synergy and work hardening *** addition,the yield strength of fully recrystallized Al_(0.1)CrFeCoNi follows a Hall–Petch relationship(σ_y=24+676d^(–1/2)),where d takes into account both grain boundaries and annealing twin *** strengthening effects of grain boundaries and annealing twin boundaries were also evaluated separately.

关键词： High-entropy alloy Ultrafine grains Annealing twins Strength Ductility

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Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium–titanium sinter reduced with CO gas at 873–1273 K

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International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 145-152页

作者： Song-tao Yang Mi Zhou Tao Jiang Xiang-xin Xue School of Metallurgy Northeastern UniversityShenyang 110819China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China key laboratory of liaoning province for recycling science of metallurgical resources Shenyang 110819China

Reduction of chromium-bearing vanadium–titanium sinter（CVTS） was studied under simulated conditions of a blast furnace, and thermodynamics and kinetics were theoretically analyzed. Reduction kinetics of CVTS at different temperatures was evaluated using a shrinking unreacted core model. The microstructure, mineral phase, and variation of the sinter during reduction were observed by X-ray diffraction, scanning electron microscopy, and metallographic microscopy. Results indicate that porosity of CVTS increased with temperature. Meanwhile, the reduction degree of the sinter improved with the reduction rate. Reduction of the sinter was controlled by a chemical reaction at the initial stage and inner diffusion at the final stage. Activation energies measured 29.22–99.69 k J/mol. Phase transformations in CVTS reduction are as follows： Fe_2O_3→Fe_3O_4→FeO→Fe; Fe_2TiO_5→Fe_2TiO_4→FeTiO_3; FeO·V_2O_3→V_2O_3; FeO·Cr_2O_3→Cr_2O_3.

关键词： sinter kinetics reduction mineral phase

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Electrorheological effect of Ti-bearing blast furnace slag with different TiC contents at 1500°C

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International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 768-775页

作者： Hong-rui Yue Tao Jiang Qiao-yi Zhang Pei-ning Duan Xiang-xin Xue School of Metallurgy Northeastern University Shenyang 110819 China liaoning key laboratory of metallurgical resources recycling science Engineering and Technology Research Center for Boron Resource ComprehensiveDevelopment and Application of liaoning province liaoning key laboratory for Ecological Comprehensive Utilization of Boron resources and Materials Shenyang110819 China

The electrorheological properties of CaO–SiO2–Al2O3–MgO–TiO2–Ti C slags were investigated to enhance understanding of the effect of TiC addition on the viscosity, yield stress, and fluid pattern of Ti-bearing slags in a direct-current electric field. The viscosities and shear stresses of 4wt% and 8wt% Ti C slags were found to increase substantially with increasing electric field intensity, whereas virtually no rheological changes were observed in the 0wt% TiC slag. The Herschel–Bulkley model was applied to demonstrate that the fluid pattern of the 4wt% TiC slag was converted from that of a Newtonian fluid to that of a Bingham fluid in response to the applied electric field; and the static yield stress increased linearly with the square of the electric field intensity.

关键词： electrorheology viscosity Ti-bearing slag titanium carbide

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Life Cycle Assessment Introduced by Using Nanorefrigerant of Organic Rankine Cycle System for Waste Heat Recovery

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Journal of Renewable Materials 2023年第3期11卷 1153-1179页

作者： Yuchen Yang Lin Ma Jie Yu Zewen Zhao Pengfei You Faculty of metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China State key laboratory of Complex Nonferrous Metal resources Cleaning Utilization in Yunnan province Kunming University of Science and TechnologyKunming650093China

The use of nanorefrigerants in Organic Rankine Cycle(ORC)units is believed to affect the cycle environment performance,but backed with very few relevant *** this purpose,a life cycle assessment(LCA)has been performed for the ORC system using nanorefrigerant,the material and energy input,characteristic indicators and comprehensive index of environmental impact,total energy consumption and energy payback time(BPBT)of the whole life cycle of ORC system using Al_(2)O_(3)/R141b nanorefrigerant were *** environmental comprehensive indexes reveal that ECER-135 index decrease by 1.5%after adding 0.2%Al_(2)O_(3)nanoparticles to *** on the contribution analysis and sensitivity analysis,it can be found out ORC system manufacturing is of the most critical stage,where,the ECER-135 index of ORC component production is the greatest,followed by the preparation process of R141b,transportation phase,and that of Al_(2)O_(3)nanoparticles preparation is *** retirement phase which has good environmental benefits affects the result significantly by recycling important ***,the main cause and relevant suggestion for improvement were traced ***,the environmental impacts of various power generations were compared,and results show that the power route is of obvious *** the renewable energy,ORC system using Al_(2)O_(3)/R141b nanorefrigerant with minimal environmental impact is only 0.67%of coal-fired power *** environmental impact of current work is about 14.34%of other nations’PV results.

关键词： Life cycle assessment Organic Rankine Cycle nanorefrigerant total energy consumption energy payback time

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An improved defect recognition framework for casting based on DETR algorithm

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Journal of Iron and Steel Research(International) 2023年第5期30卷 949-959页

作者： Long Zhang Sai-fei Yan Jun Hong Qian Xie Fei Zhou Song-lin Ran Anhui province key laboratory of metallurgical Engineering&resources recycling Anhui University of TechnologyMa’anshan 243002AnhuiChina School of metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina Technical Department Anhui Highly Precision Casting Co.Ltd.Ma’anshan 238100AnhuiChina Anhui Engineering laboratory for Intelligent Applications and Security of Industrial Internet Anhui University of TechnologyMa’anshan 243032AnhuiChina

The current casting surface defect detection algorithms suffer from poor small target defect recognition and imbalance between detection performance and detection *** improved algorithmic framework for casting defect detection was proposed based on the DEtection TRansformer(DETR)*** algorithm takes ResNet with an efficient channel attention(ECA)-Net module as the backbone *** addition,based on the original algorithm architecture,dynamic anchor boxes,improved multi-scale deformable attention module,and SIoU loss function are introduced to improve the sensitivity of transformer structure to input location information and scale size,and the small target defect detection performance is effectively *** recognition performance of the algorithm in a self-built casting defect dataset was *** improved DETR algorithm has 97.561% accuracy in recognizing two defects,namely sandinclusion and notch,with the detection rate being improved by 65.854% and 17.073% compared with the original DETR and you only look once(Yolo)-V5,*** algorithm verifies the applicability of the transformer architecture target detection algorithm for casting defect detection tasks and provides new ideas for detecting other similar application scenarios.

关键词： Casting defect recognition DEtection TRansformer Small target detection Deep learning Attention mechanism

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Effect of copper on edge cracking behavior and microstructure of rolled austenitic stainless steel plate

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Journal of Iron and Steel Research(International) 2022年第2期29卷 281-294页

作者： Guang-hui Zhao Jian Zhang Juan Li Hua-ying Li Hai-tao Liu Li-feng Ma School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Shanxi Provincial key laboratory of metallurgical Device Design Theory and Technology Taiyuan030024ShanxiChina State key laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

Cu is known to affect the edge cracking characteristics of austenitic stainless steel as it causes *** hot rolling test of four kinds of austenitic stainless steel with different copper content(0,2.42,3.60 and 4.35 wt.%)was carried out to examine the effect of hot rolling cracks on steel containing different copper *** evolution of crack and microstructure was analyzed using the scanning electron microscope,energy-dispersive spectrometer,electron back scattered diffraction and transmission electron *** results showed an upward trend in edge cracking degree when Cu content was 4.35%,and the crack extended from the edge of the steel plate to the middle by about 14 ***,severe oxidation was observed inside the crack by *** the increase in copper content at 1250℃,the content of{110}brass and{112}copper textures *** the content of copper was 4.35%,the decrease was most significant,and{112}copper texture content decreased to only 0.5%.Generally,the textures of 2.42%Cu and 3.60%Cu 304L steel changed little,while a large change in the texture of 4.35%Cu 304L steel was *** conclude,the increase in rolling temperature can prevent edge crack and its propagation effectively.

关键词： Austenitic stainless steel Copper Edge crack Microstructure Ferrite

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Effect of crystallization on purity of volatile metallic magnesium prepared from a one-step multi-region condensation process under vacuum condition

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Journal of Magnesium and Alloys 2022年第11期10卷 3281-3287页

作者： Bin Yang Dong Liang Neng Xiong Yang Tian Baoqiang Xu Yongnian Dai The State key laboratory of Complex Non-ferrous Metal resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China National Engineering laboratory for Vacuum Metallurgy Kunming University of Science and TechnologyKunming 650093China Faculty of metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China IME Institute of Process Metallurgy and Metal recycling RWTH Aachen UniversityAachen 52056Germany

We hereby report a green and simple volatilization-condensation process to prepare high-purity magnesium in different crystal forms under vacuum condition. This method can be also used for the analysis of other metals, which can be separated by the same concept. In addition, Mg condensation is a very fast process, and the corresponding easy growth of the Mg crystals is promoted when the concentration of magnesium vapor is raised. From the view of crystallization, ultrafast crystal growth of high-purity magnesium is a barrier-free and orderly process. Interestingly, different condensed forms of Mg obtained via this ultrafast volatilization-condensation process are showing different purities. The distinct morphological formation of Mg in different condensed form is probably attributed to the differences of surface energy change of Mg during the condensation process.

关键词： Mg Purity Vacuum Condensation Crystallization

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Synergistic effect of F and triggered oxygen vacancies over F-TiO_(2) on enhancing NO ozonation

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Journal of Environmental sciences 2023年第3期125卷 319-331页

作者： Lina Guo Xu Zhang Fanyu Meng Jing Yuan Yiqing Zeng Chenyang Han Yong Jia Mingyan Gu Shule Zhang Qin Zhong key laboratory of metallurgical Emission Reduction and resources recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Donadeo Innovation Centre of Engineering University of AlbertaEdmonton T6G 1H9Canada

Oxidation-absorption technology is a key step for NOxremoval from low-temperature *** the condition of low O_(3)concentration(O_(3)/NO molar ratio = 0.6), F-TiO_(2)(F-TiO_(2)), which is cheap and environmentally friendly, has been prepared as ozonation catalysts for NO oxidation. Catalytic activity tests performed at 120℃showed that the NO oxidation efficiency of F-TiO_(2)samples was higher than that of TiO_(2)(about 43.7%), and the NO oxidation efficiency of F-TiO_(2)-0.15 was the highest, which was 65.3%. Combined with physicochemical characteristics of catalysts and the analysis of active species, it was found that there was a synergistic effect between F sites and oxygen vacancies on F-TiO_(2), which could accelerate the transformation of monomolecular O_(3)into multi-molecule singlet oxygen(1O_(2)), thus promoting the selective oxidation of NO to NO_(2). The oxidation reaction of NO on F-TiO_(2)-0.15 follows the Eley-Rideal mechanism, that is, gaseous NO reacts with adsorbed O_(3)and finally form NO_(2).

关键词： Nitrogen oxides Catalytic ozonation Singlet oxygen Synergistic effect Reaction mechanism

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