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Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys

International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1639-1650页

作者： Yong Wang Wei Wang Joo Hyun Park Wangzhong Mu Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education&Hubei Provincial Key Laboratory for New Processes of ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081China department of Materials Science and Engineering KTH Royal Institute of TechnologySE-10044StockholmSweden department of Chemical Engineering Northeast Electric Power UniversityJilin 132012China department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Korea Engineering Materials Division of Materials ScienceDepartment of Engineering Science and MathematicsLuleå University of Technology97187 LuleåSweden

Specific grades of high-entropy alloys(HEAs)can provide opportunities for optimizing properties toward high-temperature *** this work,the Co-based HEA with a chemical composition of Co_(47.5)Cr_(30)Fe_(7.5)Mn_(7.5)Ni_(7.5)(at%)was *** refractory metallic elements hafnium(Hf)and molybdenum(Mo)were added in small amounts(1.5at%)because of their well-known positive effects on high-temperature *** characteristics were comprehensively explored by using a two-dimensional cross-sectional method and extracted by using a three-dimensional electrolytic extraction *** results revealed that the addition of Hf can reduce Al_(2)O_(3)inclusions and lead to the formation of more stable Hf-rich inclusions as the main *** addition cannot influence the inclusion type but could influence the inclusion characteristics by affecting the physical parameters of the HEA *** calculated coagulation coefficient and collision rate of Al_(2)O_(3)inclusions were higher than those of HfO_(2)inclusions,but the inclusion amount played a larger role in the agglomeration behavior of HfO_(2)and Al_(2)O_(3)*** impurity level and active elements in HEAs were the crucial factors affecting inclusion formation.

关键词： high-entropy alloy non-metallic inclusion agglomeration thermodynamics alloying

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Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting

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Journal of Iron and Steel Research International 2024年第5期31卷 1104-1116页

作者： Qing Fang Peng Zhao Hua Zhang Wen-hao Zhou Gang Yu Jia-hui Wang Hong-wei Ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hunan Valin Xiangtan Iron and Steel Co. Ltd.Xiangtan411101HunanChina Hubei Provincial Key Laboratory for New Processes of ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the *** large eddy simulation model coupled with volume of fluid model was developed to study the steel–slag–gas three-phase flow *** critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds(30,60,90 and 120 r/min)of the rotating *** numerical model was verified by water model *** results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle,the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be *** for the 2nd strand,when the rotating speeds are 30,60,90 and 120 r/min,the critical height of the free-surface vortex above the 2nd strand is 7.3,4.7,6.3 and 7.4 cm,respectively.A reasonable rotating speed should be 60 r/min,which can reduce about 2 tons of residual *** rotating speeds just can reduce about 1.6 tons of residual steel.

关键词： Tundish Free-surface vortex Stopper-rod Numerical simulation Multiphase flow

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Comparative study on interaction between rare earth oxide refractories and rare earth treated steel

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Journal of Iron and Steel Research International 2024年第6期31卷 1493-1501页

作者： Ze Meng Guang-qiang Li Cheng Yuan Yi-jiang Zhao Qing Zheng Bin Zeng Yu Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina Technical Center Lianyuan Iron and Steel Co.Ltd.Loudi417009HunanChina

Refractories have an important effect on the cleanliness of molten *** interaction between CeAlO_(3) refractories and Ce treated steel was explored and compared with that between Al_(2)O_(3) refractories and Ce treated *** results show that the Ce content in steel decreases sharply after contact with Al_(2)O_(3) refractories and the pick-up of dissolved Al *** with the test of Al_(2)O_(3) refractories,the loss of Ce content is less in the test of CeAlO_(3) refractory,and the total oxygen content and dissolved Al content in steel increase *** dense and continuous Ce_(2)O_(2)S interface layer is observed at the CeAlO_(3) refractories/steel interface,which can serve as the metallurgical isolation layer and hinder the further interaction between refractories and ***,the higher steel cleanliness and less penetration of refractories by molten steel are obtained in the test of CeAlO_(3) *** CeAlO_(3) refractories show a promising prospect in the production of clean Ce treated steel.

关键词： CeAlO_(3)refractory Steel Cleanliness Interaction Rare earth

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Designing for Long Campaign Life Blast Furnace (1)──The Mathematical Model of Temperature Field for Blast Furnace Lining and Cooling Apparatus and New Concept of Long Campaignship Blast Furnace Cooler Design

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International Journal of Minerals,Metallurgy and Materials 1999年第3期13卷 178-182页

作者： Susen Cheng Qingguo Xue Weiguo Yang kaolin Wu Tianjun Yang(Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China)(ironmaking department, Bejing Central Engineering and Incoporation of Iron and Steel Industry, Bejing, 1000 Metallurgy School University of Science and Technology Beijing Beijing 100083 China ironmaking department Bejing Central Engineering and Incoporation of Iron and Steel Industry Bejing 100053 China

The physical and mathematical model of temperature field for blast furnace stave coolers was established. The computation results show that the heat resistance of 2-6 mm water scale within the cooling pipe is about 7%-20% of the total heat resistance of cooling stave body, as for drilling duct type, the heat resistance of 2-6 mm water scale is about 88%-98% of the total heat resistance. Using drilling duct or full cast pipe can eliminate gas clearance and coating layer between pipes and cast iron body and reduce the heat resistance of the cooler sharply and improve the coefficient of heat transfer to a great extent. The water velocity within coolers can be kept at the 1evel of 0.5- 1 .5 m/s, the higher water velocity can not decrease the hot surface temperature, but can increase energy consumption for cooling water.

关键词： blast furnace cooler mathematical model heat resistance water velocity

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Wetting between molten iron and prereduced ilmenite with carbon

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 924-929页

作者：王玉明袁章福赵宏欣熊绍锋姜伟忠李肇毅 department of Energy and Resources Engineering College of EngineeringPeking University Institute of ironmaking Research Baoshan Iron and Steel Co.Ltd State Key Laboratory of Multi-Phase Complex System Institute of Process EngineeringChinese Academy of Sciences

An interfacial study between molten iron and the prereduced ilmenite with carbon was conducted at different melting temperatures by the sessile droplet *** wetting characteristics between molten iron and the prereduced ilmenites with carbon were investigated by measuring contact angle of the droplet of molten iron on the prereduced ilmenite *** images of the interface were also examined by the optical microscope and SEM equipped with *** volume of molten iron increased with the melting temperature increasing when titania or high-content titania slag was used as the *** contact angle decreased with the melting temperature increasing and it was independent on time at constant *** contact angle was positively correlated with the reduction degree of the ilmenite,but the work of adhesion was negatively correlated with *** smelting temperature was beneficial to the separation of iron and Ti *** permeability of molten iron into the prereduced ilmenite with carbon was more obvious with reduction degree increasing owing to the high porosity of prereduced ilmenite.

关键词： molten iron prereduced ilmenite wetting interfacial permeability contact angle carbon reduction

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Electrochemistry during efficient copper recovery from complex electronic waste using ammonia based solutions

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 308-316页

作者： Zhi Sun Hongbin Cao Prakash Venkatesan Wei Jin Yanping Xiao Jilt Sietsma Yongxiang Yang 1 department of Materials Science and Engineering TU Delft 2628 CD Delft the Netherlands National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China ironmaking department R&D Tata Steel 1970 CA IJmuiden the Netherlands

Leaching selectivity during metal recovery from complex electronic waste using a hydrochemical process is always one of the generic issues. It was recently improved by using ammonia-based leaching process, specifically for electronic waste enriched with copper. This research proposes electrodeposition as the subsequent approach to effectively recover copper from the solutions after selective leaching of the electronic waste and focuses on recognising the electrochemical features of copper recovery. The electrochemical reactions were investigated by considering the effects of copper concentration, scan rate and ammonium salts. The diffusion coefficient, charge transfer coefficient and heterogeneous reaction constant of the electrodeposition process were evaluated in accordance with different solution conditions. The results have shown that electrochemical recovery of copper from ammonia- based solution under the conditions of selective electronic waste treatment is charge transfer controlled and provide bases to correlate the kinetic parameters with further optimisation of the selective recovery of metals from electronic waste.

关键词： copper recovery electronic waste end-of-life products selective leaching electrodeposition

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Preliminary Evaluation of Injecting Brown Coalsin ironmaking Blast Furnace

Preliminary Evaluation of Injecting Brown Coalsin Ironmaking...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Shen Y S Liao J H Yu A B Li Y T Zhu J M department of Chemical Engineering Monash University ironmaking Baosteel

Pulverized coal injection(PCI)iswidely practised in ironmaking industry due to many benefits in particular the reduction of production cost,where black coal was largely used at *** brown coal with aneven lower cost has a great potential to be used in PCI technology and further reduce the cost by replacing the black *** brown coal needs upgrading before burning in the furnace aiming for removing the massive moisture0%,usually by briquetting or *** is unclear whether the brown coal products can be used in ironmaking blast furnace(BF)and replicate the performance of black coal in aspects of aerodynamic and physicochemical *** this study,an industry-scale three-dimensional CFD PCI model is used to preliminarily study the feasibility of using brown coals in PCI operation by comparing the coal combustion efficiency of brown coalsupgraded by briquetting andpyrolysis with one given black coal under typical PCI conditions,in terms of flow,temperature,gas composition and coal combusts *** simulation results indicate that the brown coal upgraded by briquettingshowsquite different coal burnoutat the raceway end while the brown coal upgraded by pyrolysis shows similar burnout at the raceway end,compared to the given black *** modelling offers a cost-effective way to optimize and control the injection of different brown coals upgraded by different methods under PCI conditions.

关键词： blast furnace brown coal PCI CFD

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Reduction mechanism of natural ilmenite with graphite

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中国有色金属学会会刊：英文版 2008年第4期18卷 962-968页

作者：王玉明袁章福郭占成谭强强李肇毅姜伟忠 State Key Laboratory of Multi-phase and Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190ChinaInstitute of Ironmaking ResearchBaoshan Iron and Steel Co.LtdShanghai 201900China State Key Laboratory of Multi-phase and Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190ChinaDepartment of Energy and Resources Engineering College of Engineering Peking University Beijing 100871 China State Key Laboratory of Multi-phase and Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Institute of ironmaking Research Baoshan Iron and Steel Co.LtdShanghai 201900China

Reduction of Bama ilmenite concentrate containing 49.78% TiO2 and 27.96% total Fe by graphite was studied using thermogravimetric analysis system under argon gas ambient from 850 to 1 400 ℃. The reduction degree of Bama ilmenite is enhanced with increasing temperature and the molar ratio of carbon to oxygen, and the reaction rate varies with temperature and reduction time simultaneously. The phase transformation, chemical composition, microstructure and morphology of reduced samples were investigated by using X-ray diffractometry, scanning electron microscopy, and energy disperse spectroscopy, respectively. The high content of impurities in Bama ilmenite evidently bates the reduction of ilmenite. Forming the enrichment zone of manganese prevents complete reduction of Fe2+. The reduction products are mostly reduced iron, rutile, reduced rutiles, Ti3O5 and pseudobrookite solid solution. The reduction kinetics was also discussed. The results show that the reduction temperature is a key factor to control reaction rate.

关键词：钛铁矿还原机制热重分析法杂质动力学石墨

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Comparison of sintering performance of typical specular hematite ores with distinct size distributions

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Journal of Iron and Steel Research International 2017年第10期24卷 1007-1015页

作者： Cong-cong Yang De-qing Zhu Ben-jing Shi Jian Pan Li-ming Lu Xiao-bo Li Ya-ping Mo School of Minerals Processing&Bioengineering Central South UniversityChangsha 410083HunanChina CSIRO Mineral Resources Brisbane QLD 4069Australia Products&Technique Management department Baosteel Zhanjiang Iron and Steel Co.Ltd.Zhanjiang 524000GuangdongChina ironmaking Plant Wuhan Iron and Steel Company LimitedWuhan 430083HubeiChina

The sintering performance of three typical specular hematite ores（coarse SO-A,intermediate SO-B and ultrafine SO-C）was compared in an industrial ore blend through pilot-scale sinter pot *** effect of particle size of specular hematite ores on their granulation and sintering performance was *** with the coarse SO-A fine and ultrafine SO-C concentrate,the intermediate SO-B showed inferior granulation and sintering performance characterized with poorer bed permeability and productivity,lower sinter strength and higher fuel rates.A new material preparation method was hence proposed and verified at both pilot and industrial *** proposed method by mixing SO-B with a high amount of goethitetype iron ore fines was found to be an effective way in improving the granulation and assimilative characteristics of ore blend comprising 31%intermediate SO-B,leading to improved sinter productivity and lowered fuel *** metallurgical properties and microstructure of sinters were also *** sinters obtained through the proposed preparation method were generally stronger and more reducible on account of better sinter structure with more relict hematite ultimately connected with needle-like silico-ferrite of calcium and aluminum and lower porosity.

关键词： Sinter Specularite Iron ore Size distribution Granulation Goethite

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Industrial Experiment on Coke Spraying With ZBS Additive in Blast Furnace

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Journal of Iron and Steel Research International 2006年第3期13卷 14-17页

作者： ZHU Zi-zong ZHANG Zhu-ming TANG Qi-yong YANG Xue-feng ZHANG Kun-hua ZHAO Xian-sheng College of Materials Science and Engineering Chongqing University Chongqing 400044 China department of Science and Technology Kunming Iron and Steel Co Ltd Kunming 650302 Yunnan China Coking Plant Kunming Iron and Steel Co Ltd Kunming 650302 Yunnan China ironmaking Plant Kunming Iron and Steel Co Ltd Kunming 650302 Yunnan China

In order to improve the thermal properties of coke, an industrial experiment on the coke spraying with ZBS additive solution was carried out at coking plant and No. 6 blast furnace （2 000 m^3 ） of Kunming Iron and Steel Co Ltd. The coke reaction index （CRI） of the coke spraying with ZBS additive solution decreases by 10. 56 %, and the coke strength after reaction （CSR） increases by 7.80% in comparison with those of the un-sprayed coke. During the experiment, the average iron output increases by 66. 69 t/d, and the coke rate is reduced by 5. 21 kg per ton iron, while the fluctuation of furnace temperture is small, and sulphur content in hot metal and 100% of hot metal are acceptable.

关键词： coke CRI CSR blast furnace industrial experiment

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