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Numerical and Experimental Investigation on Heat PropagationThrough Composite Sinter Bed With Non-Uniform Voidage:Part Ⅱ Prediction of Process Efficiency

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Journal of Iron and Steel Research International 2010年第10期17卷 1-6页

作者： Sergey V Komarov Hiroyuki Shibata Naohito Hayashi eiki kasai Nippon Light Metal Company Tohoku University

The results of numerical simulation of the mosaic embedding iron ore sintering （MEBIOS） process according to the model presented in the first part of the study are introduced. The main objective of the second part is the elucidation of key factors influencing the process efficiency, particularly the sintering completeness, velocity of the heat wave propagation and maximum temperature achievable in the pellet during the wave propagation. Numerical results reveal that the mass fraction of coal, diameter of coal particles and air inlet velocity are of prime importance in determining efficiency of the MEBIOS sintering process.

关键词： sintering MEBIOS process heat propagation mechanism numerical simulation process efficiency

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Vapor pressure measurement of lead and lead chlorides in FeO_T-CaO-SiO_2-Al_2O_3 system

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2772-2780页

作者：张延玲 eiki kasai 北京科技大学钢铁冶金新技术国家重点实验室北京100083 Graduate School of Environmental Studies Tohoku University

Vapor pressure of lead and lead chlorides from FeOT？CaO？SiO2？Al2O3 slag system was measured by using Knudsen effusion method. The results suggest that the vapor pressures of lead and lead chlorides increase with increasing temperature. For the slag systems without chlorine, the logarithm of vapor pressure （lnp） shows highly linear dependency on the reciprocal of temperature （1/T）, and higher vapor pressure is observed in the condition where more metallic lead vapor is formed. In this case, the vapor pressure of lead increases with increasing slag basicity （w（CaO）/w（SiO2））, increasing FeO content andw（Fe2＋）/w（Fe3＋） ratio. For the case of slag system with chlorine addition, the total pressures of PbCl2 and PbCl increase with decreasing basicity and FeO content of slag.

关键词：金属Pb vapor pressure Knudsen effusion method metallic Pb lead chlorides smelting process

Structural Change of the Iron Ore Sintering Bed and its Control

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Structural Change of the Iron Ore Sintering Bed and its Cont...

Fundamental Approach to a Low-carbon Sintering Process of Iron Ores

技术创新与循环经济——第二届宝钢学术年会

作者： eiki kasai Institute of Multidisciplinary Research for Advanced Materials Tohoku University2-1-1 KatahiraSendai981-3108Japan

＜正＞Design of bed structure is a promising approach to increase the productivity of sinter under the condition of increasing use of iron ores containing high combined *** this paper,the characteristics of the structural change of the sintering bed obtained by the in situ observation using X-ray CTS is described and based on it a new process image "MEBIOS" is *** a series of model experiments were conducted and the results proved that this process provide a mechanism of high speed sintering.

关键词： iron ore sintering design of bed structure sinter cake void network large pellet X-ray CTS

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Fundamental Approach to a Low-carbon Sintering Process of Ir...

Recent collaborative researches between Japanese universities and steel industry on the iron ore agglomeration process

第十届中国钢铁年会暨第六届宝钢学术年会

作者： Kazuya Fujino Taichi Murakami eiki kasai Graduate School of Environmental Studies Tohoku University

Low-carbon sintering has been an important target as well as low-carbon operation of blast furnace(BF), since CO emission from the iron ore sintering occupies about 14% of the total emissions of an integrated steelworks. It is notable that the backgrounds on the low-carbon technology are a little different between the iron ore sintering and BF processes. A decrease in reducing agent rate of BF may lead to decreases in the formed amount of BF gas and/or coke oven gas. Hence, a certain amount of external energy input will be necessary in order to compensate the energy shortage in the downstream processes. On the contrary, the sintering process usually does not supply a large amount of energy to other processes. It means that lowering the amount of carbonaceous materials used in the sintering process will efficiently lead to a reduction of CO emission. Therefore, development of an innovative low-carbon sintering technology is strongly required, which can also produce quality sinter, adapting to the significant change in the iron ore property. Here, a possible approach to a low-carbon sintering technology is discussed considering the characteristics of the sintering process. Dusts, scales and magnetite ores are taken up as potential materials to replace coke as alternative agglomeration agents, since they contain lower oxides of iron, i.e., Fe, FeO and FeO and metallic iron, which give heat through oxidation reactions. Oxidation behaviors of Fe in the sintering bed is examined based on the experimental results.

关键词： reduction of CO2 emission alternative agglomeration agent metallic iron oxidation reaction coke combustion

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Baosteel Technical Research 2010年第S1期4卷 1-页

作者： eiki kasai Institute of Multidisciplinary Research for Advanced Materials(IMRAM) Tohoku University Sendai 980-8577Japan

The properties of iron ores used in ironmaking process have been drastically changed in the past couple of ***,the change has become significant in the last few years because of the considerable increase in the world steel *** property change of the iron ore is mainly caused by the depletion of the hard and high-grade lump hematite *** has led to the increasing use of ores containing a larger amount of goethite/limonite,i.e.,hydro-oxides of ***,the proportion of pisolitic ores,which are course limonitic ores,has remarkably increased by several times in ***,large deposits of the fine goethite ores called Marra Mamba have been developed in Australia and exported to Asian *** trends will be continued in *** the change of the ore properties affects not only to the productivity and yield of the sinter but also its metallurgical properties in the blast furnace,further improvement in the sintering technology/ process is required including the preliminary treatment process of raw *** order to make wide researches concerning the above issues,the research project 'New Sintering Process through Designing of Composite Granulation & Bed Structure' was formed in the ISIJ,which was the collaborative project between Japanese steel companies and several *** project was started in 2005 and carried on the wide range of studies for three and half *** main objects are the characterization of pisolitic/goethitic ores and the understanding the behavior during the iron ore sintering ***,considering the ore characteristics,some basic researches on the optimum designs of raw material blending,granulation,bed structure,and the metallurgical properties of the produced sinter were *** project have invented the technical principle of a new sintering process, namely MEBIOS(Mosaic EmBedding Iron Ore Sintering Process),characterized by the composite granulation and bed-structure,

关键词： iron ore agglomeration process ironmaking hematite ore metallurgical property sintering process

Zn在FetO-CaO-SiO2-Al2O3渣系中的挥发行为

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中国有色金属学报 2008年第1期18卷 163-170页

作者：张延玲李士琦葛西荣辉路俊萍郭晓东北京科技大学冶金与生态工程学院北京100083 东北大学多元物质科学研究所日本仙台980-8577

研究Zn在含Cl的FetO-CaO-SiO2-Al2O3渣系中的挥发行为,包括挥发气体种类、挥发率以及各因子如温度、渣成分、添加剂等的影响。应用吉布斯自由能最小化原则,热力学计算显示在本实验温度条件下,样品90%渣+10%ZnO+CaCl2中的挥发气体为金属Z... 详细信息

研究Zn在含Cl的FetO-CaO-SiO2-Al2O3渣系中的挥发行为,包括挥发气体种类、挥发率以及各因子如温度、渣成分、添加剂等的影响。应用吉布斯自由能最小化原则,热力学计算显示在本实验温度条件下,样品90%渣+10%ZnO+CaCl2中的挥发气体为金属Zn、ZnCl2及FeCl2。实验结果表明,金属Zn及FeCl2气体挥发量随温度增加而增加,而ZnCl2气体量却随之降低。反应初期,样品挥发速度很快,10 min后基本趋于稳定,ZnCl2主要形成于样品升温期间(室温至实验温度1 190℃),恒温期间,生成的ZnCl2与FeO反应生成FeCl2气体及ZnO,后者又被FeO还原成金属Zn气体。渣成分中,FeO含量和二元碱度CaO/SiO2对Zn的挥发气体种类及挥发率有重要影响。添加还原剂如C粉可显著提高Zn的挥发率。

关键词： FetO-CaO-SiO2-Al2O3渣系 Zn 挥发行为

FeO-CaO-SiO2-Al2O3渣系中锌及其氯化物的饱和蒸气压测试

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北京科技大学学报 2008年第7期30卷 717-723页

作者：张延玲路俊萍王玉刚葛西荣辉郭晓东北京科技大学冶金与生态工程学院北京100083 东北大学多元物质科学研究所日本仙台980-8577

利用Knudsen喷射法得到了FeO-CaO-SiO2-Al2O3渣系中Zn及其氯化物的蒸气压,并考察了各因素如温度和渣成分的影响.结果表明:在本实验条件下,金属Zn与ZnCl2蒸气压随温度的升高而升高,且ZnCl2蒸气压的对数与温度的倒数之间呈明显的线性关系... 详细信息

利用Knudsen喷射法得到了FeO-CaO-SiO2-Al2O3渣系中Zn及其氯化物的蒸气压,并考察了各因素如温度和渣成分的影响.结果表明:在本实验条件下,金属Zn与ZnCl2蒸气压随温度的升高而升高,且ZnCl2蒸气压的对数与温度的倒数之间呈明显的线性关系;渣碱度对金属Zn与ZnCl2的蒸气压呈完全不同的影响趋势,前者随碱度的增加而升高,而后者则降低;渣中FeO含量升高,能够显著提高金属Zn与ZnCl2的蒸气压.

关键词： FeO-CaO-SiO2-Al2O3渣系锌氯化物饱和蒸气压喷射法

Effects of Feces on Spatial Distribution Patterns of Grazed Grassland Communities

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Agricultural Sciences in China 2010年第1期9卷 121-129页

作者： Tamanna Islam eiki Fukuda Masae Shiyomi Molla Rahman Shaibur Shigenao Kawai Mikinori Tsuiki The United Graduate School of Agricultural Sciences Iwate UniversityMorioka 020-8550Japan National Agricultural Research Center for Tohoku Region Morioka 020-0198Japan Faculty of Science Ibaraki UniversityMito 310-8512Japan Department of Environmental Science and Health Management Jessore Science and Technology UniversityJessore 7400Bangladesh

Animals excrete feces during grazing. The uneven distribution of feces causes a spatial heterogeneity in grassland communities. In this study, we attempted to clarify the effects of feces on spatial distribution patterns of plant species. A field study was conducted on four grasslands each grazed by a single cow. These four grasslands were defined as Poa pratensis （Kentucky bluegrass） dominated grassland without feces （PoF-）, Poa pratensis dominated grassland with feces （PoF＋）, Zoysia japonica Steud. （Japanese lawngrass） dominated grassland without feces （ZyF-）, and Zoysia japonica Steud. dominated grassland with feces （ZyF＋）. A 50 m line that transects 100 equally spaced quadrats （L-quadrats） was drawn on each of the four grasslands. Each quadrat was 0.50 m × 0.50 m in size and consisted of four equal-area cells of 0.25 m ×0.25 m （S-quadrats）. The occurrences of all plant species were recorded in each S-quadrat. The binomial distribution （BD） and beta-binomial distribution （BBD） were used to represent the variation in spatial patterns. The BBD provided a significant description of the frequency distribution of plants per quadrat. A power law was used to calculate the spatial heterogeneity of each species together with the community heterogeneity. The results revealed that the plants on each of the four grasslands were aggregatively distributed. The ZyF＋ exhibited greater spatial heterogeneity than the ZyF-due to the uneven deposition of feces by cows grazing on the grasslands. Additionally we also found that the feces had effect on the heterogeneity inZyF＋ and did not have effect in PoF＋.

关键词： beta-binomial distribution power law feces grazing grassland spatial distribution

Nanodot array deposition via single shot laser interference pattern using laser-induced forward transfer

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International Journal of Extreme Manufacturing 2020年第2期2卷 114-118页

作者： Yoshiki Nakata eiki Hayashi Koji Tsubakimoto Noriaki Miyanaga Aiko Narazaki Tatsuya Shoji Yasuyuki Tsuboi Institute of Laser Engineering Osaka University2-6 YamadaokaSuitaOsaka 565-0871Japan Institute for Laser Technology 1-8-4 Utsubo-honmachiNishi-kuOsaka 550-0004Japan National Institute of Advanced Industrial Science and Technology Chuo 21-1-1 UmezonoTsukubaIbaraki 305-8568Japan Department of Chemistry Osaka City University3-3-138SugimotoSumiyoshi-kuOsaka 558-8585Japan

Laser-induced forward transfer(LIFT)is a direct-writing technique capable of depositing a single dot smaller than the laser wavelength at small shot energy through the laser-induced dot transfer(LIDT)*** deposit a single nanodot in a single shot of laser irradiation,a liquid nanodrop is transferred from donor to receiver and finally solidified via a solid–liquid–solid(SLS)*** conventional LIDT experiments,multi-shots with step scanning have been used to form array ***,interference laser processing can achieve an arrayed process and generate a periodic structure in a single *** this study,a femtosecond laser interference pattern was first applied to LIDT,and an array of nanodots was successfully deposited in a single shot,producing the following unit structures:a single dot,adjoining dots,and stacking *** diameter of the smallest nanodot was 355 nm,and the narrowest gap between two adjoining nanodots was 17.2 *** LIDT technique produces high-purity,catalyst-free that do not require post-cleaning or alignment *** these significant advantages,LIDT can expand the usability of nanodots in a wide range of fields.

关键词： interference laser processing laser-induced dot transfer nanodot array femtosecond laser solid-liquid-solid mechanism Au