检索结果-南通市图书馆

Recovery rates of iron, nickel, and chromium via iron-bath reduction of stainless steel dust briquettes based on corundum crucible erosion balance analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第3期25卷 320-329页

作者： Fei Yuan Hui-ning Zhang Hui Li Jian-hong Dong Hui-hui Xiong An-jun Xu School of metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083 China School of Metallurgy and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000 Jiangxi China china metallurgical Industry planning and Research Institute Beijing 100083 China

The leaching of chromium from stainless steel dust （SSD） is deleterious to the environment. To address this issue, the reduction of SSD briquettes can be employed to effectively extract chromium. The recovery rates of iron, chromium, and nickel via ironbath reduction of SSD briquettes were determined using X-ray fluorescence spectroscopy, X-ray diffraction, and scanning electron microscopy measurements. First, the effects of basicity and contents of silicon, iron, CaF2, and carbon on the recovery rates of the three metals were analyzed using the slag amount prediction model, which was originally established from the A1203 balance of corundum crucible erosion behavior. Second, the effect of feeding mode, i.e., whether steel scrap and SSD briquettes were simultaneously added, on the recovery rates was discussed in detail. Third, the iron-bath reduction of SSD briquettes was thermodynamically analyzed. The results indicated that the recovery rates of the three metals are greater than 95% those of using a basicity of 1.5 and 6.0% CaF2, 15% carbon, and 7% ferrosilicon. The recovery rate of chromium increases twofold with the addition of ferrosilicon. The feeding mode of adding briquettes and steel scrap simultaneously is better for recovery of metals and separation of the metal and slag than the feeding mode of adding steel scrap firstly and then briquettes.

关键词： Stainless steel dust Erosion model Ferrosilicon Iron Nickel-Chromium Recovery Iron-bath reduction

Investigation of the kinetic mechanism of the demanganization reaction between carbon-saturated liquid iron and CaF2–CaO–SiO2-based slags

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第4期25卷 399-404页

作者： Sheng-chao Duan Chuang Li Han-jie Guo Jing Guo Shao-wei Han Wen-sheng Yang School of metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing 100083 China china metallurgical planning and Research Institute Beijing 100711 China

The demanganization reaction kinetics of carbon-saturated liquid iron with an eight-component slag consisting of CaO–SiO2–MgO–FeO–MnO–Al2O3–TiO2–CaF2 was investigated at 1553, 1623, and 1673 K in this study. The rate-controlling step（RCS） for the demanganization reaction with regard to the hot metal pretreatment conditions was studied via kinetics analysis based on the fundamental equation of heterogeneous reaction kinetics. From the temperature dependence of the mass transfer coefficient of a transition-metal oxide（MnO）, the apparent activation energy of the demanganization reaction was estimated to be 189.46 kJ·mol^–1 in the current study, which indicated that the mass transfer of MnO in the molten slag controlled the overall rate of the demanganization reaction. The calculated apparent activation energy was slightly lower than the values reported in the literature for mass transfer in a slag phase. This difference was attributed to an increase in the ＂specific reaction interface＂（SRI） value, either as a result of turbulence at the reaction interface or a decrease of the absolute amount of slag phase during sampling, and to the addition of calcium fluoride to the slag.

关键词： demoaganization reaction kinetics reaction mechanism kinetic model rate-controlling step mass transfer coefficient apparent activation energy

Effect of Nickel on Formation Mechanisms of Silico-ferrite of Calcium and Aluminum(SFCA)

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2015年第6期22卷 478-486页

作者： Xin-yu LI Bu-xin SU Lei-ge XIA Jian-liang ZHANG Hong-wei GUO School of metallurgical and Ecological Engineering University of Science and Technology Beijing Department of Smelting and Raw Material China Metallurgical Industry Planning and Research Institute Shagang School of Iron and Steel Soochow University

Under the pressures of both the de＇crease of high-grade high quality iron ore resources and the increase of raw material costs, the iron and steel enter＇prises in china turn to adopt iron ores which contain special elements such as nickel, manganese, etc. in the sintering blend. Anaiytica｜ reagents were used for sintering experiments, and the sinters were analyzed with X-ray diffraction, s6ailning electron microscopy and mineralogical microscopy to study the effect of nickel on the silico ferrite of calcium and aluminum （SF（＇A） bonding phase formation during sinte- ring. The results indicated that SFCA was divided into nickel containing and nickel-free areas due to the presence of nickel. The increasing content of nickel would greatly reduce the content of SFCA and promote the formation of calcium aluminum silicate. A great deal of Fe2 Oa participated in the crystal transition to Fe3 O3 , reducing the a mount of Fe2O2 involved in the formation of calcium ferrite. When the blending ratio of NiO, which is used to provide the nickel in the sintering process, is less than 3 % , the calcium ferrite is in substantially interleaving cot rosion with hematite and magnetite. Both the porosity and silicate glass phase content are low, which contributes to the sintering production.

关键词： nickel SFCA sinter effect mechanism

Effect of Coke Reaction Index on Reduction and Permeability of Ore Layer in Blast Furnace Lumpy Zone Under Non-Isothermal Condition

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第4期20卷 6-10页

作者： ZHAO Hong-bo BAI Yong-qiang CHENG Shu-sen State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of metallurgical and Ecological Engineering University of Science and Technology Beijing china metallurgical Industry planning and Research Institute

Reasonable control on CRI（coke reaction index）is one of the key factors for BF（blast furnace）low-carbon ***,there are contrary *** is increasing CRI to improve reaction efficiency in BF and the other is decreasing CRI to suppress coke degradation in *** methods are adopted to realize effective catalysis（increasing CRI）and passivation（decreasing CRI）of *** tests of coke in BF lumpy zone under gradual temperature rising have been *** of CRI on gas composition,ore reduction,burden column permeability and heat reserve zone′s temperature under non-isothermal condition are *** combined with iron making calculations,a novel BF operation suggestion is proposed as coke nut with small size be catalyzed and mixed with ore while skeletal coke with large size be passivated and separately charged into BF.

关键词： blast furnace low carbon smelting resistance loss coke reaction index

First-principles study on stability, electronic, and mechanical properties of La-C and Ce-C binary compounds

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第7期26卷 771-778页

作者： Hui-ning Zhang Qiu-yan Wu Zhen-ying Hu Hui Li Hui-hui Xiong An-jun Xu School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 Jiangxi China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 Hubei China Hubei Provincial Key Laboratory for New Processes of Iron making and Steelmaking Wuhan University of Science and Technology Wuhan 430081 Hubei China Ganhua Security Technology Co. Ltd. Nanchang 330001 Jiangxi China china metallurgical planning net Beijing 100711 China School of metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The phase stability and electronic and mechanical properties of rare earth (RE) carbides (La2C3, LaC2, Ce2C3, CeC2, and CeC) were investigated using first-principles calculations based on density functional theory. The calculated equilibrium lattice constants and cell volume agree well with available experimental data. The cohesive energy and formation enthalpy of these carbides show that they are thermodynamically and mechanically stable except LaC. The strong covalent bonding exists in these compounds, and the covalent bonds are mainly determined to be RE-C and C-C bonds. The hardness of RExCy compounds is less than 10 GPa, and the bulk modulus, shear modulus, and Young's modulus of Ce2C3 are the largest. The values of BIG (ratio of bulk modulus to shear modulus) and Poisson's ratio indicate that all the compounds have good ductility, and the ductility of CeC is larger than others. The Debye temperature of Ce2C3 is 429.67 K, which is the highest in those of experimental compounds.

关键词： Rare earth carbide Electronic structure Mechanical property First principle

Critical assessment of mixing thermodynamic functions of Fe-Al binary melts based on atom-molecule coexistence theory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第3期27卷 266-281页

作者： Xue-min Yang Jin-yan Li Fang-jia Yan Dong-ping Duan CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Department of Metallurgy and Raw Materials China Metallurgical Industry Planning and Research InstituteBeijing 100711China

In order to further verify the accuracy and feasibility of the calculated mass action concentrations Ni of Al and Fe by the developed atom and molecule coexistence theory(AMCT)model,i.e.,AMCT-N,model,for representing activities aR,i of Al and Fe in Fe-Al binary melts reported in the first part of the serial studies,the molar mixing thermodynamic functions of Fe-Al binary melts over a temperature range from 1823 to 1973 K have been calculated based on Ni of Al and Fe as well as the effect of temperature on activity coefficients 7,of Al and Fe as■lnγj/■T=■ln(Ni/xi)/dT by the developed AMCTN-Ni model,where T is absolute temperature and.v,is the mole fraction of element i or compound i in metallic *** reported molar mixing thermodynamic functions of Fe-Al binary melts as well as the reported excess molar mixing thermodynamic functions of Fe-Al binary melts relative to ideal solution as a basis from the available literatures have been critically assessed and applied as criteria to verify the developed AMCT-Al,*** effect of changing temperature onγi of Al and Fe,i.e.,activity coefficient gradients■lnγAl/■T and■lnγFe/■T,which are two indispensable parameters to calculate the molar mixing thermodynamic functions of Fe-Al binary melts,can be accurately obtained by the developed AMCT-Ni,model and expressed by the cubic polynomial *** only the partial molar mixing thermodynamic functions of Al and Fe in Fe-Al binary melts but also the integral molar mixing thermodynamic functions of Fe-Al binary melts can be accurately calculated by the developed AMCT-Al,***,the excess partial and integral molar mixing thermodynamic functions of Fe-Al binary melts relative to ideal solution as a basis can also be precisely calculated by the developed AMCT-Ni,model.

关键词： Thermodynamic assessment Fe-Al binary melt Molar mixing thermodynamic function Excess molar mixing thermodynamic function Activity Atom and molecule coexistence theory

Decarbonization options of the iron and steelmaking industry based on a three-dimensional analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 388-400页

作者： Xin Lu Weijian Tian Hui Li Xinjian Li Kui Quan Hao Bai Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan School of metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China china metallurgical Industry planning and Research Institute(MPI) Beijing 100711China Carbon Dioxide Research Division CISDI Research&Development Co.Ltd.Chongqing 401122China

Decarbonization is a critical issue for peaking CO_(2) emissions of energy-intensive industries,such as the iron and steel *** decarbonization options of china’s ironmaking and steelmaking sector were discussed based on a systematic three-dimensional low-carbon analysis from the aspects of resource utilization(Y),energy utilization(Q),and energy cleanliness which is evaluated by a process general emission factor(PGEF)on all the related processes,including the current blast furnace(BF)-basic oxygen furnace(BOF)integrated process and the specific sub-processes,as well as the electric arc furnace(EAF)process,typical direct reduction(DR)process,and smelting reduction(SR)*** study indicates that the three-dimensional aspects,particularly the energy structure,should be comprehensively considered to quantitatively evaluate the decarbonization road map based on novel technologies or *** scrap utilization(improvement of Y)and the substitution of carbon-based energy(improvement of PGEF)in particular is *** terms of process scale,promoting the development of the scrap-based EAF or DR-EAF process is highly encouraged because of their lower *** three-dimensional method is expected to extend to other processes or industries,such as the cement production and thermal electricity generation industries.

关键词： peak CO_(2)emission low carbon management decarbonization option energy-intensity industry ironmaking and steelmaking

Physical modeling of gas induced bath flow in drained aluminum reduction cell

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第5期14卷 1017-1022页

作者：李相鹏李劼赖延清赵恒勤刘业翔 School of metallurgical Science and Engineering Central South University Changsha 410083 China

A room temperature physical model was used to study the bubble behavior and gas induced bath circulation in a drained aluminum reduction cell. By passing compressed argon through the penetrated Plexiglas box bottom plate immersed in water, gas evolution at the anode bottom surface was simulated. Bubble behavior and liquid flow field were studied and analysis was presented. Bath secondary recirculation was observed in the interpolar gap not the net rising flow as expected. Liquid driven by the bubbles forms small vortices along the interpolar gap with small mean and turbulent velocities and accordingly poor mass transfer. Secondary recirculation also exists between the slot and interpolar gap, part of the flow in the interpolar gap go to the slot with the bubbles and fluid at the bottom of the slot enters the interpolar gap directly without going to the center channel. The existence of the fluid secondary recirculation is very unfavorable to the alumina dissolution and dispersion. Increasing the anode tilt or gas flow rate, or decreasing the anode-cathode distance can make the secondary recirculation in the interpolar gap weak, however, will intensify the secondary recirculation between the slot and interpolar gap.

关键词：电池铝物理模型流体形态温度混合率 MHD 磁流体动力学

Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood Beam Based on Creep Effect

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2020年第3期14卷 229-248页

作者： Nan Guo Huajing Xiong Mingtao Wu Hongliang Zuo Fengguo Jiang Xiaofeng Hou Dabo Xin School of Civil Engineering Northeast Forestry UniversityHarbin150040China School of Civil Engineering Heilongjiang University of Science and TechnologyHarbin150027China Heilongjiang metallurgical Design planning Institute Harbin150040China

Creep is an important characteristic of bamboo and wood materials under long-term *** paper aims to study the long-term bending beha-viour of prestressed glulam bamboo-wood beam(GBWB).For this,14 pre-stressed GBWBs were selected and subjected to a long-term loading test for 60 ***,a comparative analysis was performed for the effects of pre-tension values,the number of pre-stressed wires,and long-term load on the stress variation of the steel wire and the long-term deflection of the beam *** test results showed that with the number of prestressed wires increasing,the total stress of the steel wire in the beam midspan and the ratio of the long-term deflec-tion to the total deflection decreases decreased,but when the number of steel wires exceeded 4,the total stress and long-term deflection was less infuenced;with the pre-tension value increasing,the ratio of the total stress of the steel wire in the beam midspan and the ratio of the long-temm deflection to the total deflec-tion also decreased,but when the prestress force was greater than 3.975 kN,the:total stress and long-term deflection were less affected;with the other parameters unchanged,when the value of the long-term load increased,the total stress of the steel wire decreased,and the long-temm deflection of the beam midspan increased,which shall be more significant with the long-term load greater than 30%of the standard ultimate bearing *** the test,the experimental data were fitted,and the creep coefficient was ***,the long-term stiffness calcula-tion fommula of the pre-stressed GBWB based on creep effect was *** research findings have certain theoretical significance and engineering value.

关键词： Prestressed glulam bamboo-wood beam long-temn loading test steel wire stress long-term deflection creep cofficient