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Enhancement of the nickel converter slag-cleaning operation with the addition of spent potlining

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International Journal of Minerals,metallurgy and Materials 2018年第8期25卷 881-891页

作者： Dawei Yu Kinnor Chattopadhyay School of metallurgy and Environment Central South University Canmet MINING Natural Resources Canada Process metallurgy & Modelling group Department of Materials Science and EngineeringUniversity of Toronto

The slag cleaning(or matte settling) process was experimentally investigated at 1573 K using a fayalitic nickel converter slag containing spinel and matte/alloy *** addition of various amounts of spent potlining(SPL) was studied in terms of its influence on matte settling and the overall metal *** slags produced were characterized by scanning electron microscopy,energy-dispersive spectroscopy,and wet chemical analysis using inductively coupled plasma optical emission *** presence of solid spinel particles in the molten slag hindered coalescence and settling of matte/alloy *** settling was effectively promoted with the addition of as little as 2 wt% SPL because of the reduction of spinel by the carbonaceous component of the *** reduced viscosity of the molten slag in the presence of SPL also contributed to the accelerated matte *** metal recoveries were achieved with larger amounts of added *** reduction of the molten slag at 1573 K promoted the formation of highly dispersed metal particles/clusters via accelerated nucleation in the molten slag,which increased the overall slag *** increase in viscosity,when combined with rapid gas evolution from accelerated reduction reactions,led to slag foaming.

关键词： converter slag spent potlining matte nickel matte settling fayalite

Molecular structures and activity of organic depressants for marmatite,jamesonite and pyrite flotation

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 1993-1999页

作者：陈建华李玉琼龙秋容 College of Resources and metallurgy Guangxi University College of Chemistry and Chemical Engineering Guangxi University Design and Research Institute of Mining and metallurgy Zijin Mining Group Limited Company

Ten kinds of organic depressants were used to investigate the depressing performance on marmatite and *** results show that the organic compounds only with single group of hydroxyl(-OH),carboxyl(-COOH) or amino(-NH2) in molecule are ineffective in depressing marmatite,jamesonite and *** combinations of these functional groups still cannot enhance the depressing ability of organic *** thioglycollic acid containing reductive functional group(-SH) has a good depressing performance for marmatite and *** presence of benzene ring in molecule can enhance the depressing *** functional group electronegativity,hydrophilic-hydrophobic indexes and frontier orbital of organic depressants were calculated,and the criterion for the depressing effect of organic depressants to sulphide minerals was proposed.

关键词： marmatite pyrite organic depressant frontier orbital

Kinetics of iron removal from metallurgical grade silicon with pressure leaching

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Rare Metals 2011年第6期30卷 688-694页

作者： YU Zhanliang XIE Keqiang MA Wenhui ZHOU Yang XIE Gang DAI Yongnian National Engineering Laboratory for Vacuum metallurgy Kunming University of Science and Technology Kunming 650093 China Technology Center of Yunnan metallurgy group Co. Kunming 650031 China Kunming metallurgy Research Institute Kunming 650031 China

In this paper, the kinetics of pressure leaching for purification of metallurgical grade silicon with hydrochloric acid was investigated. The effects of particle size, temperature, total pressure, and concentration of hydrochloric acid on the kinetics and mechanism of iron removal were studied. It was found that the reaction kinetic model followed the shrinking core model, and the apparent activation energy of the leaching reaction was 46.908 kJ/mol. And the apparent reaction order of iron removal with pressure leaching was 0.899. The kinetic equation was obtained and the mathematical model of iron removal from metallurgical grade silicon （MG-Si） was given as follows：The values calculated from the equation were consistent with the experimental results.

关键词： metallurgical physics and chemistry kinetics pressure leaching metallurgical grade silicon iron removal

A coupled model of TiN inclusion growth in GCr15SiMn during solidification in the electroslag remelting process

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International Journal of Minerals,metallurgy and Materials 2015年第12期22卷 1266-1272页

作者： Liang Yang Guo-guang Cheng Shi-jian Li Min Zhao Gui-ping Feng Tao Li State Key Laboratory of Advanced metallurgy University of Science and Technology Beijing Dongbei Special Steel group

TiN inclusions observed in an ingot produced by electroslag remelting （ESR） are extremely harmful to GCrl5SiMn steel. Therefore, accurate predictions of the growth size of these inclusions during steel solidification are significant for clean ESR ingot production. On the basis of our previous work, a coupled model of solute microsegregation and TiN inclusion growth during solidification has been established. The results demonstrate that compared to a non-coupled model, the coupled model predictions of the size of TiN inclusions are in good agreement with experimental results using scanning electron microscopy with energy disperse spectroscopy （SEM-EDS）. Because of high cooling rate, the sizes of TiN inclusions in the edge area of the ingots are relatively small compared to the sizes in the center area. During the ESR process, controlling the content of Ti in the steel is a feasible and effective method of decreasing the sizes of TiN inclusions.

关键词： coupled model solidification inclusions bearing steel electroslag remelting

Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

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International Journal of Minerals,metallurgy and Materials 2024年第5期31卷 833-841页

作者： Haibo Feng Shaohua Li Kexiao Wang Junheng Gao Shuize Wang Haitao Zhao Zhenyu Han Yong Deng Yuhe Huang Xinping Ma Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute for Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Pangang group Panzhihua Iron and Steel Research Institute Co.Ltd. Panzhihua 617000China

Understandings of the effect of hot deformation parameters close to the practical production line on grain refinement are crucial for enhancing both the strength and toughness of future rail *** this work,the austenite dynamic recrystallization(DRX)behaviors of a eutectoid pearlite rail steel were studied using a thermo-mechanical simulator with hot deformation parameters frequently employed in rail production *** single-pass hot deformation results reveal that the prior austenite grain sizes(PAGSs)for samples with different deformation reductions decrease initially with an increase in deformation ***,once the deformation temperature is beyond a certain threshold,the PAGSs start to *** can be attributed to the rise in DRX volume fraction and the increase of DRX grain with deformation temperature,***-pass hot deformation results show that the accumulated strain generated in the first and second deformation passes can increase the extent of *** the case of complete DRX,PAGS is predominantly determined by the deformation temperature of the final *** suggests a strategic approach during industrial production where part of the deformation reduction in low temperature range can be shifted to the medium temperature range to release rolling mill loads.

关键词： eutectoid pearlite rail steel prior austenite grain size dynamic recrystallization single-pass hot deformation three-pass hot deformation

Preparation and Metallurgical Analysis of High Activity Burnt Lime for Steelmaking

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Journal of Iron and Steel Research International 2016年第9期23卷 884-890页

作者： Hua-qiang HAO Yu-zhu ZHANG Su-ju HAO Chao-fa ZHANG Wu-feng JIANG Peng-hui CUI College of metallurgy Northeastern University Department of Long Product Tangshan Iron and Steel CompanyHebei Iron and Steel Group College of metallurgy & Energy Key Laboratory of the Ministry of Education for Modern Metallurgy TechnologyNorth China University of Science and Technology

Burnt lime is an important material in steelmaking and its activity degree is a key factor for liquid steel quality. The burnt lime was made by the calcination of limestone in a high pressure electric furnace. The burnt lime mineralogical phases and micro-morphologies were characterized by X-ray diffraction （XRD） and field emission scan- ning electron microscopy （FE-SEM）. The burnt lime activity degree was determined by acid-base titration, the burnt lime pore distribution was measured by mercury intrusion porosimetry （MIP）, and the thermal effect of a mixture of burnt lime and slag was measured by differential scanning calorimetry （DSC）. The results showed that the CaO grain size and pore size of burnt lime made under high pressure were larger than those of burnt lime made under atmos- pheric pressure. The CaO grain size and pore size increased and the laminate phenomenon also occurred clearly under high pressure. The activity degree of burnt lime made under high pressure was greater than that made under atmos- pheric pressure. The maximum activity degree was 437 mL for burnt lime made under a pressure of 0.4 MPa. For the same ratio of CaO to SiOz, the melting temperature, hemisphere temperature and fluidity temperature of slag decreased with increasing burnt lime activity degree. The higher the activity degree the burnt lime had, the better the slag forming occurred. It was advantageous for -2CaO · SiO2 and 3CaO · SiO2 forming at lower temperatures if the burnt lime activity degree was increased.

关键词： burnt lime high pressure calcination activity degree physical property slag performance

Preparation of casting alloy ZL101 with coarse aluminum-silicon alloy

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中国有色金属学会会刊：英文版 2008年第1期18卷 116-120页

作者：尤晶王耀武冯乃祥杨明生 School of Materials Science and metallurgy Northeastern University Dengfeng Electric group Aluminum Alloy Corporation

The coarse Al-Si alloy produced by carbothermal reduction of aluminous ore contains 55% Al,25% Si and some *** main impurities are slag and *** process of manufacturing casting Al-Si alloy ZL101 with the coarse Al-Si alloy was *** phase constitution and microstructure of the coarse Al-Si alloy,slag and ZL101 were examined by X-ray diffractometry and scanning electron *** results show that the content of silicon and iron in the casting alloy reduces with the increase of the dosage of purificant and manganese,but increases with the rise of filtering *** is found that casting Al-Si alloy conforming to industrial standard can be produced after refining by using purificant,and removing iron by using manganese and added magnesium.

关键词： Al-Si合金焊剂精练铸模技术金属处理

Influence of Structural Modification on Work-hardening Behaviour of Type 316 Stainless Steel

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Journal of Materials Science & Technology 1998年第5期14卷 399-401页

作者： K.G.Samuel S.L.Mannan and P.Rodriguez (metallurgy and Materials group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India) metallurgy and Materials group Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 India

Work-hardening behaviour of type 316 austenitic stainless steel having difFerent initial dislocation structures introduced by swaging to various levels is analysed by a simplified Kock's model which takes into account the structural changes through the dislocation accumulation and annihilation process during deformation. The dislocation accumulation and annihilation factors show a temperature and structure dependence. The dislocation annihilation factor shows a plateau or decreasing tendency in the dynamic strain ageing (DSA) temperature range. This is attributed as either due to dislocation accumulation being more pronounced than dislocation annihilation or as due to precipitates being formed at DSA temperatures acting as obstacles to dislocation motion in the DSA temperature range.

关键词： Work Influence of Structural Modification on Work-hardening Behaviour of Type 316 Stainless Steel

Roughness characterization and shearing dislocation failure for rock-backfill interface

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International Journal of Minerals,metallurgy and Materials 2024年第6期31卷 1167-1176页

作者： Meifeng Cai Zhilou Feng Qifeng Guo Xiong Yin Minghui Ma Xun Xi Key Laboratory of High-Efficient Mine and Safety of Metal Mines of Ministry of Education Beijing 100083China Key Laboratory of Urban and Underground Space Engineering University of Science and Technology BeijingBeijing 100083China Shandong Gold group Co LtdJinan 250102China

Shearing dislocation is a common failure type for rock–backfill interfaces because of backfill sedimentation and rock strata movement in backfill mining *** paper designed a test method for rock–backfill shearing *** digital image techno-logy and three-dimensional(3D)laser morphology scanning techniques,a set of 3D models with rough joint surfaces was ***,the mechanical behavior of rock–backfill shearing dislocation was investigated using a direct shear *** effects of interface roughness on the shear–displacement curve and failure characteristics of rock–backfill specimens were *** 3D fractal dimen-sion,profile line joint roughness coefficient(JRC),profile line two-dimensional fractal dimension,and the surface curvature of the frac-tures were *** correlation characterization of surface roughness was then analyzed,and the shear strength could be measured and calculated using *** results showed the following:there were three failure threshold value points in rock–backfill shearing dis-location:30%–50%displacement before the peak,70%–90%displacement before the peak,and 100%displacement before the peak to post-peak,which could be a sign for rock–backfill shearing dislocation *** surface JRC could be used to judge the rock–backfill shearing dislocation failure,including post-peak sliding,uniform variations,and gradient change,corresponding to rock–backfill disloca-tion failure on the field *** research reveals the damage mechanism for rock–backfill complexes based on the free joint surface,fills the gap of existing shearing theoretical systems for isomerism complexes,and provides a theoretical basis for the prevention and control of possible disasters in backfill mining.

关键词： rock–backfill roughness correlation characterization shearing dislocation interface failure