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Super-high bed sintering for iron ores:variation and optimization of bed resistance

Journal of Iron and Steel Research International 2025年第1期32卷 40-51页

作者： Liang-ping Xu Lin Xiong Hui-bo Liu Xi-duan Yang Ai-xiang Mao Pei-dun Chen Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Central Research Institute Baosteel Group Co.Ltd.Shanghai201900China Manufacturing Management Department Guangdong Zhongnan Iron and Steel Co.Ltd.Shaoguan512123GuangdongChina Technology and Development Center Shandong Taishan Iron and Steel Group Co.Ltd.Jinan271100ShandongChina

As the bed depth increases,sintering yield increases,but the productivity *** reveal the reasons for the decrease in productivity and explore targeted solutions,the bed resistance of mixtures,wet zone,and co.bustion zone was analyzed in the *** results showed that the decreased porosity of mixture resulted in the increased bed resistance by 160.56%when the bed depth increased from 600 to 1000 *** improving porosity of 1%by adding loosening bars with optimized size and distribution,the bed resistance decreased,and the productivity increased by 5%.The increase in bed depth increased the thickness of the wet zone from 120 to 680 mm and the resistance from 1.56 to 8.83 *** using a three-stage intensive mixer and pre-adding water for granulation,the moisture of mixture was reduced by 0.6%,and the sintering productivity increased by 4%.Besides,the high bed resistance is mainly caused by the increase in the thickness of the co.bustion zone from 31.9 to 132.7 mm,and the bed resistance increased from 0.70 to 5.62 *** bed resistance of the co.bustion zone at 900 mm was increased by 90.51%co.pared to 700 *** optimization of the distribution of co.e breeze,the thickness of co.bustion zone at the lower layer decreased from 132.7 to 106.84 mm and permeability improved significantly.

关键词： Super-high bed sintering Bed resistance Permeability Productivity Wet zone co.bustion zone

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Role of iron ore in enhancing gasification of iron co.e:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron co.e provides a green pathway for low-carbon *** unco.er the influence mechanism of iron ore on the behavior and kinetics of iron co.e gasification,the effect of iron ore on the microstructure of iron co.e was ***,a co.parative study of the gasification reactions between iron co.e and co.e was co.ducted through non-isothermal thermogravimetric *** findings indicate that co.pared to co.e,iron co.e exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for co.(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron co.e due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for co.e to 192.5 kJ/mol for iron co.e 15wt%.

关键词： low-carbon ironmaking iron co.e gasification structural evolution kinetic model

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co.rosion action and passivation mechanism of magnesium alloy in fluoride solution

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中国有色金属学会会刊：英文版 2009年第1期19卷 50-54页

作者：李建中黄久贵田彦文刘常升 School of metallurgy and Materials Northeastern University Steel Sheet co.d Rolling Plant Baosteel Branch Baosteel Co. Ltd.

co.rosion action and passive mechanism of magnesium alloy in the fluoride solution were studied by means of scanning electron microsco.y(SEM), energy dispersive X-ray spectrosco.y(EDS), and electrochemistry methods. The results show that an insoluble MgF2 film is generated on the surface of magnesium alloy activated in the hydrofluoric acid. And the mass of the deposited MgF2 film may reach a co.stant value, when the mass ratio of Mg/F on the magnesium alloy surface is fixed at 11.3-1. The activated magnesium alloy gains a ‘passivation state’ in a mixture of sulfuric acid and hydrofluoric acid at a volume ratio of less than 1.2. At the same time the mass of magnesium alloy is maintained as a function of the time. When the ratio is above 1.4, the mass of magnesium alloy rapidly decreases. The passive film formed through adsorption of HF2- (or H2F3-, H3F4-) ions by the deposited MgF2 film can protect the magnesium alloy from co.rosion in fluoride solution, but not in non-fluoride solutions. The passive state is maintained for activated magnesium alloy in an acidic sulfuric nickel solution with added fluoride. If fluoride and carbonate are added to the acidic sulfuric nickel solution, a replacement reaction between magnesium alloy and solution takes place.

关键词：镁合金腐蚀硫酸镍金属腐蚀

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Application of Ce(IV) in industrial wastewater treatment

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Journal of Rare Earths 2010年第S1期28卷 37-39页

作者：赵建军李炳伟杨晨轩饶向东 Zibo baosteel Lingzhi Rare Earth Hi-Tech co. Ltd.

At present,rare earth application in wastewater treatment has beco.e more and more widely,acco.ding to the fact that the Ce(IV) has the strong oxidation ability under acid co.dition,we have studied the application of Ce(IV) in industrial wastewater treatment *** showed that oxidation-reduction reaction occurred between Ce(IV) and the organic co.pounds or other reducing substances in industrial wastewater,thereby the co.ority and co.cr reduced ***(IV) formed [Ce(OH)x·nH2O](4-x)+ after hydrolyzation and Ce(III) obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3-x)+ after hydrolyzation,these hydrate had big specific surface area,co.ld adsorb the suspension substances and removed toxic or harmful ions in industrial *** treatment by Ce(IV),the analytical results of industrial wastewater are as follows:The co.cr became 58 mg/L from 1646 mg/L,the total co. removal efficiency was more than 95.0%.Turbidity reduced to no more than 10NTU from *** chroma became 6 degree from 26 degree,suspension substances co.tent decreased to no more than 2 mg/L from 36 mg/L,and total arsenic and fluorion became <0.05 mg/L and <0.10 mg/L from 0.60 and 15.3 mg/*** cadmium reduced to 0.01 mg/L from the 0.58 mg/*** all indicated that Ce(IV) was one kind of latent good water treatment chemical.

关键词： wastewater treatment Ce(IV) co.cr water treatment chemical rare earths

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Determination of Interfacial Heat Flux of Stainless Steel Solidification on co.per Substrate During the First 0.2 s

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Journal of Shanghai Jiaotong university(Science) 2011年第1期16卷 65-70页

作者：张卫于艳方园李建国 School of Materials Science and Engineering Shanghai Jiaotong University baosteel Research Institute Baosteel Co. Ltd

Interfacial heat transfer is a key issue in many solidification *** the paper,a novel experimental apparatus has been designed and on this basis,the instantaneous interfacial heat transfer between molten steel or solidified shell and co.per substrate during the first 0.2 s has been *** investigated parameters include melt superheat,substrate temperature and surface *** results show that the peak value of the interfacial heat flux in the first stage of liquid/solid co.tact increases with melt superheat and changes slightly with substrate temperature and surface *** interfacial heat flux in the stage of solid/solid co.tact has a similar trend of slow decrease in most co.ditions.

关键词： rapid solidification interfacial heat transfer heat flux

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Effects of Alloy Elements on Oxidation Resistance and Stress-Rupture Property of P92 Steel

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Acta metallurgica Sinica(English Letters) 2015年第2期28卷 129-138页

作者： Gang Liu Yu-Lai Xu Cai-Xiong Yang Xue-Shan Xiao Xi-Min Chen Xiao-Ke Zhang Xiang-Jun Meng Laboratory for Microstructures Institute of Materials Shanghai University baosteel Special Materials co. Ltd

Effects of alloy elements Cr, W, Ce, and Si on oxidation behavior at 750℃ in air and stress-rupture properties of P92 steel have been investigated. The proper increase in elements Cr, W, and Ce improved to varying degrees both oxidation resistance by either facilitating more protective Cr2O3 or modifying surface morphologies and stress-rupture life largely attributed to the formation of fine Laves phase. The excessive addition of Si significantly improved oxidation resistance of P92 steel, but dramatically impaired the stress-rupture life due to the formation and co.rsening of Laves phase. The results indicate that proper additions of Cr, W, and Ce are beneficial for the co.prehensive property of P92 steel.

关键词： P92 Oxidation resistance Stress-rupture property Microstructure

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Investigation of Susceptibility to Intergranular co.rosion of Tin-Added Austenitic Stainless Steel

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Acta metallurgica Sinica(English Letters) 2015年第9期28卷 1183-1189页

作者： Min Sun Yuan-Yuan Yang Ming Luo Lai-Zhu Jiang Yi-Ming Jiang Jin Li Department of Materials Science Fudan University Research and Development Center Baosteel Co. Ltd.

The intergranular co.rosion （IGC） character of tin-added B316LX and the influence of tin addition on IGC susceptibility were investigated by DL-EPR, oxalic acid etch test and transmission electron microsco.y. IGC susceptibility of B316LX is mainly caused by the precipitation of M23C6 carbide and intermetallic Laves phase. DL-EPR test is unsuitable to evaluate the IGC susceptibility of B316LX with long-time sensitization, because more carbides and inter- metallic phases are formed at grain boundaries and inside the grains, which induce more severe IGC and pits attacks. Tin addition increases the IGC susceptibility, maybe due to diffusion of tin toward grain boundaries.

关键词： Stainless steel Tin SEM TEM Intergranular co.rosion

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Microstructure and Properties of a Low Carbon Ti-V Microalloyed Steel

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Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1491-1495页

作者： PEI Xinhua JIA Tao The State Key Lab of Rolling & Automation Northeastern University Meishan Iron & Steel co. Ltd baosteel co. Ltd

Due to the largely inhomogeneous deformation among co.stituent phases, the advanced high-strength multi-phase steels are always facing challenges when applied to automotive parts where local formability is critically required. In this work, two characteristic microstructures were produced from a low carbon Ti-V microalloyed steel by varying the co.ling path. In the ferrite single-phase microstructure resulted from "ultra-fast co.ling(UFC) + furnace-co.ling(FC)", the hole-expanding ratio of 200% and tensile strength of 647 MPa were achieved. In the ferrite-bainite-martensite(F+B+M) multi-phase microstructure produced by "UFC + air-co.ling(AC) + UFC", the ferrite has been strengthened by Ti-V carbides to promote the strain partitioning, which resulted in the tensile strength of ≥780 MPa, a moderate elongation and hole-expanding ratio of 93%. The strengthening co.tributions of Ti-V carbides were calculated to be 126 MPa and 149 MPa in the ferrite single-phase and F+B+M multi-phase microstructure, respectively.

关键词： orowan strengthening ultra-fast co.ling high-strength hole-expanding ratio Ti-V carbide

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Thermal Scratch on Surface of SUS430 Stainless Steel Strip in co.d Rolling Process

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Journal of Iron and Steel Research International 2014年第3期21卷 282-286页

作者： Chang-sheng LI Jin-shan CHEN Wen-long HAN You-yuan LI Bo FU State Key Laboratory of Rolling and Automation Northeastern University baosteel Stainless Steel co. Ltd.

The thermal scratch significantly influences the surface quality of the stainless steel in co.d strip rolling. The thermal scratch has a close relation to the rolling parameters, the rolls surface and the emulsions used in rolling. In order to explain the thermal scratch on the strip surface, the co.d roiling process of SUS430 stainless steel strip was investigated in the laboratory. The thermal scratch defect occurs frequently in the seco.d rolling pass （maximum reduction in height is 32.3 ~）, especially on the lower surface of strips. When co.centration and temperature of the emulsion are the same, the thermal scratch on the surface o{ the strip is aggravated with increasing the roll surface roughness. With the same roll surface roughness and emulsion co.centration, the thermal scratch is obviously more severe at an emulsion temperature of 63 ℃ than 55 ℃. With the same roll surface roughness and emulsion tempera- ture, the thermal scratch is distinctly weaker at the emulsion co.centration of 6 % than that of 3 %.

关键词： stainless steel thermal scratch emulsion roll surface roughness

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A 2.5-dimensional Analytical Model of co.d Leveling for Plates with Transverse Wave Defects

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Journal of Iron and Steel Research International 2015年第8期22卷 664-671页

作者： Wei-hua CHEN Juan LIU Zhen-shan CUI Ying-jie WANG Ying-rui WANG National Die & Mold CAD Engineering Research Center Shanghai Jiaotong University baosteel co. Ltd.

Waves occurring in co.d-rolled plates or sheets can be divided into longitudinal and transverse waves. Classical leveling theories merely solve the problem of longitudinal waves, while no well accepted method can be employed for transverse waves. In order to investigate the essential deformation law of leveling for plates with transverse waves, a 2.5-dimensional （2.5- D） analytical approach was proposed. In this model, the plate was transversely divided into some strips with equal width; the strips are co.sidered to be in the state of plane strain and each group of adjacent strips are assumed to be deformation co.patible under stress. After calculation, the bending deformation of each strip and the leveling effect of overall plate were obtained by co.prehensNe co.sideration of various strips along with the width. Bending of roller is a main approach to eliminate the transverse waves, which is widely accepted by the industry, but the essential effect of bending of roller on the deformation of plates and the calculation of bending of roller are unknown. Acco.ding to the 2.5-D analytical model, it can be found that, for plates, it is neutral plane offsetting and middle plane elongation or co.traction under inner stress that can effectively improve plate shape. Taking double side waves as an example, the appropriate values of bending of roller were obtained by the 2.5-D analytical model related to different initial unevenness, which was applicable to the current on-line adjusting of bending of roller in rolling industry.

关键词： plate leveling 2.5-dimensional analytical model transverse wave middle plane deformation

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