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Study of Argon/Molten Steel Two-Phase Flow in Refining of High Clean Steel Using Two-Fluid Model

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Journal of Iron and Steel Research International 2011年第S2期18卷 176-181页

作者： tsukihashi fumitaka Department of Advanced Materials Science Graduate School of Frontier Science University of Tokyo Kashiwa 277-8561 Japan

RH vacuum degasser is a very important secondary refining device in the production of high quality steels. The flow field of molten steel in RH system plays a significant role in determining productivity of the equipment. The homogeneous model and VOF method were often used to predict the flow field in RH system, but these kinds of models simplified the interaction between gas bubbles and molten steel. In the present work, a numerical model of a whole RH system, including vacuum degasser, immersed legs and ladle,was built based on gas-liquid two-fluid model, and it could be used to analyze the interaction between argon bubbles and molten steel, to understand the effect of the bubble size to the flow field.

关键词： RH vacuum degasser gas-liquid two-phase flow two-fluid model interaction

Phase Equilibrium for the CaO-SiO_2-FeO-P_2O_5 System at 1673K for Dephosphorization With Multi Phase Flux

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Journal of Iron and Steel Research International 2011年第S2期18卷 84-86页

作者： Hiroyuki MATSUURA fumitaka tsukihashi Graduate School of Frontier Sciences The University of Tokyo Kashiwa Chiba 277-8561 Japan

Development of the efficient hot metal dephosphorization processes during steelmaking process is one of the most essential topics for the production of high grade clean steels. Since the formation of solid solution composed of tricalcium phosphate and dicalcium silicate could obtain a considerable mass transfer of phosphorus from liquid slag into solid phase during hot metal dephosphorization, itcould obviously sustain a high phosphatecapacityof theliquid slag without huge consumption of lime or addition of fluxes, such as fluorite. The above outlines are the main idea of multi phase flux dephosphorization. For the last few decades, many studies have been done towards the scientific principles and the commercial utilization of this technique. However, the reaction mechanism by using multi phase fluxes remains unclear even by now due tolack of evidence. Based on those previous works, providing a reliable and available phase diagram for the fundamental understanding of the reaction mechanism of multi phase flux dephosphorization has become the main purpose of present research. As well known, the CaO-SiO2-FeO-P2O5 slag is the main component of current steelmaking process. Hence the CaO-SiO2-FeO-P2O5 system at equilibrium has been studied at 1673K with low oxygen partial pressure. The solid phase coexisting with liquid flux is approved to be the solid solution composed of CaO, SiO2 and P2O5. Phosphorus distributes mainly in solid solution rather than liquid phase.

关键词： steelmaking dephosphorization multi phase flux thermodynamics phase diagram

Recycling of ironmaking and steelmaking slags in Japan and China

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 739-749页

作者： Hiroyuki Matsuura Xiao Yang Guangqiang Li Zhangfu Yuan fumitaka tsukihashi Graduate School of Engineering The University of TokyoTokyo 113-8656Japan Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China The University of Tokyo Tokyo 113-8656Japan

The mass production of steel is inevitably accompanied by large quantities of *** treatment of ironmaking and steelmaking slags is a great challenge in the sustainable development of the steel *** and China are two major steel producing countries that have placed a large emphasis on developing new technologies to decrease slag emission or promote slag *** are almost completely reused or recycled in ***,due to stagnant infrastructural investments,future applications of slags in conventional sectors are expected to be *** new functions or applications of slags has become a research priority in *** example,the utilization of steelmaking slags in offshore seabeds to create marine forests is under *** is the top steel producer in the *** utilization ratios of ironmaking and steelmaking slags have risen steadily in recent years,driven largely by technological *** example,hot stage processing of slags for materials as well as heat recovery techniques has been widely applied in steel plants with good ***,increasing the utilization ratio of basic oxygen furnace slags remains a major *** innovations in slag recycling are crucial for the steel industries in Japan and ***,the current status and developing trends of utilization technologies of slags in both countries are reviewed.

关键词： ironmaking steelmaking slag recycling seawater stabilization

Dissolution of Al_2TiO_5 inclusions in CaO-SiO_2-Al_2O_3 slags at 1823 K

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 646-651页

作者： De-yong Wang Jun Liu Mao-fa Jiang fumitaka tsukihashi Hiroyuki Matsuura School of Materials and Metallurgy Northeastern University Shenyang 110004 China Department of Advanced Materials Science Graduate School of Frontier Sciences Tokyo University Chiba 277-8561 Japan

Al-Ti-O inclusions always clog submerged nozzles in Ti-bearing Al-killed steel.A typical synthesized Al2TiO5 inclusion was immersed in a CaO-SiO2-Al2O3 molten slag for different durations at 1823 *** Al2TiO5 dissolution paths and mechanism were revealed by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）.Decreased amounts of Ti and Al and increased amounts of Si and Ca at the dissolution boundary prove that inclusion dissolution and slag penetration simultaneously ***2 diffuses or penetrates the inclusion more quickly than CaO,as indicated by the w（CaO）/w（SiO2） value in the reaction region.A liquid product （containing 0.7-1.2 w（CaO）/w（SiO2）,15wt%-20wt% Al2O3,and 5wt%-15wt% TiO2） forms on the inclusion surface when Al2TiO5 is dissolved in the ***2TiO5 initially dissolves faster than the diffusion rate of the liquid product toward the bulk *** increasing reaction time,the boundary reaches its largest distance,the Al2TiO5 dissolution rate equals the liquid product diffusion rate,and the dissolution process remains stable until the inclusion is completely dissolved.

关键词： steelmaking aluminium titante molten slag inclusions dissolution

Thermodynamic Properties of Inclusions Formed Aluminum-Titanium Deoxidation of Molten Steel

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Journal of Iron and Steel Research International 2011年第S2期18卷 298-300页

作者： Wonjin CHOI Kenji NAKASE Hiroyuki MATSUURA fumitaka tsukihashi Graduate School of Frontier Sciences The University of Tokyo Kashiwa Chiba 277-8561 Japan

Titanium alloyed steel has been widely used as automobile sheet steels, thick plate steels, and also stainless steels to improve the mechanical and chemical properties of many grade steels. Since Ti has strong affinity with oxygen, Ti is normally alloyed after Al deoxidation to keep the high yield of Ti. Therefore, Al-Ti deoxidation is one of the common and important secondary refining processes. Although the chemical stability diagram for this system has been reported by many researchers, these diagrams are inconsistent significantly each other. In the present study, the stability region of Al2TiO5 oxide was measured by equilibrating Fe-Al-Ti alloy and Al2TiO5 pellet in Al2O3 crucible at 1873 K. However, inclusions in metal after equilibration were Ti-containing Al2O3 or Al-containing TiOx. The precise phase diagrams and related thermodynamic data for the Al2O3-TiOx-FeO system should be determined.

关键词： thermodynamics inclusions Al2O3 TiOx submerged entry nozzle clogging phase diagram

Equilibrium of CaO-SiO2-FeO-P2O5 multi phase flux at 1673K with low oxygen partial pressure for dephosphorization

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Equilibrium of CaO-SiO2-FeO-P2O5 multi phase flux at 1673K w...

Ninth International Conference on Molten Slags,Fluxes and Salts(MOLTEN12)

作者： Hiroyuki MATSUURA fumitaka tsukihashi Graduate School of Frontier Sciences The University of Tokyo2778561Japan

＜正＞Dephosphorization process by using multi phase flux could significantly decrease the consumption of CaO and prevent environmental harmful fluorite ***,the equilibrium phase relationship remains unclear,which is ... 详细信息

关键词： Steelmaking multi phase flux phase relationship equilibrium dephosphorization

Utilization of Steelmaking Slag for Rehabilitation of Marine Environment

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Utilization of Steelmaking Slag for Rehabilitation of Marine...

第十届中国钢铁年会暨第六届宝钢学术年会

作者： MATSUURA Hiroyuki tsukihashi fumitaka Graduate School of Frontier Sciences The University of Tokyo

Steelmaking slag is one of the main by-products of steelmaking process, and approximately 13 million tons of BOF slag are generated annually in Japan. Ironmaking and steelmaking slags have to be effectively utilized for the development of sustainable steelmaking process. In Japan, most of steelmaking slag is recycled as civil engineering materials and so on. Since the demand of steelmaking slag as construction materials is expected to decrease with the formation of developed society, the recycling use of slags becomes important issues. Two schemes should be considered to solve the issues of steelmaking slag, first one is to reduce the amount of slag generation by the improvement of refining processes and second one is to find the new application way of steelmaking slag in other fields by adding the new functional properties. Recently, steelmaking slags are utilized as the rehabilitation materials for marine environment. In the present paper, the present situation of slag generation and previous and present research projects regarding slag utilization in Japan are introduced and the possibility of utilization of slag for rehabilitation materials of marine environment as a new recycling technology is discussed. Some fundamental experimental results conducted in our research group are also introduced.

关键词： ironmaking and steelmaking slag recycling marine environment

Behavior of Non-metallic Inclusions in a Continuous Casting Tundish with Channel Type Induction Heating

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Behavior of Non-metallic Inclusions in a Continuous Casting ...

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Wang Qiang Li Baokuan tsukihashi fumitaka School of Materials and Metallurgy Northeastern University Department of Advanced Materials Science Graduate School of Frontier SciencesThe University of Tokyo

A transient 3D mathematical model has been developed for the motion of inclusions in a continuous casting tundish with channel type induction *** Euler-Lagrange approach was employed,and the inclusion trajectories were obtained by numerical solution of the motion equation including gravity,buoyancy,drag,lift,added mass,Brownian,electromagnetic pressure and thermophoretic ***,the collision and coalescence of inclusions and adhesion to the lining solid surfaces were also taken into *** Brownian,Stokes and turbulent collision were clarified,*** effect of induction heating power on the inclusion behavior was *** results indicate that the electromagnetic pressure force significantly promotes the removal of inclusions,especially for the bigger *** the thermophoretic force goes against the removal of inclusions,its influence is negligibly *** removal ratio of inclusions in the tundish with induction heating increases from 67.45%to 96.43%while the power varies from800k W to 1200k *** collision and coalescence should be included when model the inclusion motion,because it can promote the removal of *** turbulent and Brownian collision becomes more active with the increasing power,while the Stokes collision is just opposite.

关键词： tundish induction heating inclusion motion collision and coalescence removal ratio

Recovery of Zinc and Lead from Electric Arc Furnace Dust by Using Selective Chlorination and Evaporation Reaction

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Recovery of Zinc and Lead from Electric Arc Furnace Dust by ...

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Kitao Hiroki Matsuura Hiroyuki tsukihashi fumitaka Department of Advanced Materials Science Graduate School of Frontier SciencesThe University of Tokyo

Selective chlorination and evaporation reactions could become one of the applicable methods for the treatment of electric arc furnace dust containing considerable amount of zinc and lead. In this study, the selective chlorination and evaporation rate of the FeO–ZnFeO–Zn O–Pb O mixture or practical electric arc furnace dust with Ar–Cl–O gas was measured at 1073 K by gravimetry and the effects of partial pressures of chlorine and oxygen on the Zn and Pb removal rates were investigated. Zinc oxide and lead oxide contained in the oxide mixture were selectively chlorinated and zinc and lead chlorides evaporated to gas phase, while iron oxide remained as oxide in a residue. By chlorinating with Ar–Cl gas, over 99 % of zinc and lead was removed from oxide mixture as well as about 3 % of iron was lost by the chlorination and evaporation reactions. Selective chlorination using Ar–Cl–O gas was conducted to decrease the loss of iron and improve the efficiency of the selective chlorination and evaporation reactions. The selectivity of zinc and lead was improved by using O gas mixture. In the case of practical electric arc furnace dust, over 99 % of zinc was removed while about 17 % of iron was also lost by the chlorination and evaporation reactionswith Cl–O gas.

关键词： electric arc furnace dust zinc lead selective chlorination and evaporation recycling