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Review on improving gas permeability of blast furnace

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Journal of Iron and Steel Research International 2020年第2期27卷 121-131页

作者： Yu-zhu Pan Hai-bin Zuo jing-song Wang Qing-guo Xue Guang Wang Xue-feng She State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Blast furnace ironmaking process is the most mature and highly effective process for producing liquid *** furnace is a gas-solid and gas-solid-liquid countercurrent reactor,and maintaining gas permeability is the precondition of smooth ***,improving the gas permeability throughout the blast furnace remains a hot issue which is concerned by many metallurgical *** to the research results of many scholars,the dominant factors influencing the gas permeability of different locations in the blast furnace(locations are distinguished according to the morphology change of the burdens)were *** the strategies for improving the gas permeability of different locations in the blast furnace were summarized based on these dominant influencing factors,such as suppressing the low-temperature reduction degradation of sinter in the lump zone,improving the indirect reduction degree and suppressing the interaction between different *** is hoped to provide both theoretical and practical values for guiding the blast furnace so as to improve smooth operation and smelting efficiency.

关键词： Ironmaking Blast furnace Gas permeability Location

Constructing mild expanded graphite microspheres by pressurized oxidation combined microwave treatment for enhanced lithium storage

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Rare Metals 2021年第4期40卷 837-847页

作者： Can-Liang Ma Zhen-Hui Hu Ning-jing song Yun Zhao Yan-Zhen Liu Hui-Qi Wang Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Institute of Molecular ScienceShanxi UniversityTaiyuan 030006China College of Chemistry and Chemical Engineering Jinzhong UniversityJinzhong 030619China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China School of Energy and Power Engineering School of Material Science and EngineeringNorth University of ChinaTaiyuan 030051China

The modified graphite anode materials have some prominent advantages over other anode materials in the industrial applications.A novel simple and gentle method is proposed to synthesize the mild expanded graphite microspheres(MEGMs) from flake graphite spheres through a combined modified pressurized oxidation combined with the microwave *** microstructural results demonstrate that moderately expanded MEGMs with an expansion volume between 4 and 10 ml·g^(-1)exhibit a highly microporous structure with an enlarged interlayer spacing,a decreased microcrystalline size,as well as an increased number of functional groups on the surface,resulting in the increased storage sites and spaces for lithium ions and the enhanced diffusion rate of lithium *** used as the anode material for lithium-ion batteries,the MEGM-T75t30 obtained by oxidation treatment at 75℃ for 30 min followed by microwave irradiation for expansion displays a high reversible capacity of 446.7 mAh·g^(-1) at 100 mA·g^(-1) after 100 cycles and excellent rate performance(330 and 116 mAh·g^(-1) at 800 and 3200 mA·g^(-1),respectively).Therefore,the MEGMs prepared by this convenient and mild method show excellent electrochemical properties and good application potential.

关键词： Pressurized oxidation Microwave treatment Mild expanded graphite microspheres Microstructure Graphitic anode material Lithium-ion battery

State Transition Induced by Self-Steepening and Self Phase-Modulation

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Chinese Physics Letters 2014年第1期31卷 33-36页

作者： jing-song, He Shu-Wei, Xu Ruderman, M. S. Erdélyi, R. Department of Mathematics Ningbo University Ningbo 315211 DAMTP University of Cambridge Cambridge CB3 0WA UK School of Mathematics University of Science and Technology of China Hefei 230026 Solar Physics and Space Plasma Research Centre University of Sheffield Sheffield S3 7RH UK

We present a rational solution for a mixed nonlinear Schr6dinger （MNLS） equation. This solution has two free parameters, a and b, representing the contributions of self-steepening and self phase-modulation （SPM） of an associated physical system, respectively. It describes five soliton states： a paired bright-bright soliton, a single soliton, a paired bright-grey soliton, a paired bright-black soliton, and a rogue wave state. We show that the transition among these live states is induced by self-steepening and SPM through tuning the values of a and b. This is a unique and potentially fundamentally important phenomenon in a physical system described by the MNLS eauation.

关键词： SCHRODINGER equation SELF-phase modulation NONLINEAR optics RESEARCH SOLITONS

Reduction Characteristics and Kinetics of Bayanobo Complex Iron Ore Carbon Bearing Pellets

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Journal of Iron and Steel Research International 2013年第5期20卷 28-33页

作者： DING Yin-gui WANG jing-song SHE Xue-feng WANG Guang XUE Qing-guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The kinetics of isothermal reduction of the carbon bearing pellets, which were mainly composed of Bayanobo complex iron ore and pulverized coal, was investigated by thermogravimetry at the temperature of 1 273-1 673 K. The effects of xC/xO and the atmospheres on the extent of reduction also were investigated. The results indicate that the fractional reaction increased proportionally with temperature increasing and heating temperature is the significant influence factor to the reaction of carbon bearing pellets. The optimum xC/xO is 1.2 and the effect of atmosphere on the reduction of iron oxides is almost negligible. The results can be interpreted that the reaction was initially controlled by a mixed controlled mechanism of carbon gasification and interface chemical reaction, and in the later stage, interface chemical reaction became the rate-controlling step. Apparent activation energy values of reduction at different levels of fractional reaction were calculated. Before F （fraction of reaction）=0.5, the apparent activation energy ranges from 66.39 to 75.64 kJ/mol, while after F=0.5, the apparent activation energy is 80.98 to 85.37 kJ/mol.

关键词： Bayanobo complex iron ore carbon bearing pellet thermogravimetry apparent activation energy

Efficacy of Qizi Yusi Pill on Pregnancy Outcomes in Women of Advanced Reproductive Age:A Multicenter,Randomized,Double-Blind,Placebo-Controlled Trial

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Chinese Journal of Integrative Medicine 2022年第8期28卷 675-682页

作者： ZHANG Yi QIAO Yan LI Li GAO Dan-dan song jing-yan SUN Zhen-gao College of Traditional Chinese Medicine Shandong University of Traditional Chinese MedicineJinan250355China The First Clinical College Shandong University of Traditional Chinese MedicineJinan250014China Reproductive and Genetic Center of Integrated Medicine The Affiliated Hospital of Shandong University of Traditional Chinese MedicineJinan250011China

Objective:To evalvate efficacy of Qizi Yusi Pills(QYP),a Chinese medicine compound preparation,on in vitro fertilization-embryo transfer(IVF-ET)in women of advanced reproductive ***:This multicenter,randomized,double-blind,placebo-controlled trial was conducted from June 2018 to October2019.A total of 124 patients were randomly allocated to either the QYP group or the placebo group using a stratified block randomization design,with 62 patients in each *** patients completed controlled ovarian stimulation using a standard gonadotropin-releasing hormone agonist(GnRH-a)long *** the QYP group,QYP was administered while the control group received *** and placebo were administered for a total of 24 to 30 days from the day of GnRH-a pituitary downregulation to transvaginal oocyte *** medications were taken orally at doses of 10 g three times each *** primary outcome was cumulative pregnancy rate,and the secondary outcomes were periodic medication,follicular status,serum hormone and endometrial ***-up continued until 4 weeks after *** and neonatal complications,such as gestational diabetes,were also ***:Overall,119 patients completed the study,60 in the QYP group and 59 in the placebo *** protocol(PP)analysis revealed that 6-month cumulative pregnancy rate in the QYP group was significantly higher than that in the placebo group[43.33%(26/60)vs.25.42%(15/59),P=0.040].Additionally,more oocytes were retrieved from the QYP group than those from the placebo group(8.95±3.12 vs.7.85±1.91,P=0.022).Moreover,the endometrial thickness of HCG day in the QYP group was significantly higher than that in the placebo group(11.78±2.27 mm vs.10.68±2.07 mm,P=0.012).Maternal and neonatal complications between the two groups were not significantly different(P>0.05).Intention-to-treat analysis was in line with PP ***:QYP can enhance ovarian reserve capacity and ovarian response,and possibl

关键词： advanced age Qizi Yusi Pills in vitro fertilization-embryo transfer randomized controlled trial

Laser Surface Remelting of Medium Ni-Cr Infinite Chilling Cast Iron Roll

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材料热处理学报 2004年第05B期25卷 1009-1012页

作者： YAOJian-hua ZHANGQun-li XIEsong-jing ZhefiangUniversityofTechnology HangzhouChina

Laser surface remelting of medium Ni-Cr infinite chilling cast iron was performed with a continuous wave COa laser beam with the power of 7 KW under the argon shielding. The microstructural analysis of the laser remelted layer by optical microscope shows that the laser remelted layer consists of three zones, which is the melting zone, the transition zone and the heat affected zone. The size of the dendrite of the melting zone is only in the 1/10 to 1/30 range of that of the substrate. The distribution of the hardness of the laser remelted layer was detected, and the carrying capacity of rolling steel was also field-tested. The results show that both the hardness of the remelted layer and the carrying capacity all increase, especially, the carrying capacity was 50% increased compared with the substrate.

关键词：激光重熔铸铁轧辊显微结构晶粒细化硬度承载能力 Ni-Cr激冷

Synthesis, structure characterization, and ion exchange properties of a novel open-framework ecomaterial silicotitanate

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Rare Metals 2002年第3期21卷 170-174页

作者： YU Bo, WENMingfen, CHEN jing, and song ChongliInstitute ofNuclear Energy Technology, Tsinghua University, Beijing 00084, China Institute of Nuclear Energy Technology Tsinghua University 北京 100084

A novel open-framework ecomaterial silicotitanate (Na_4Ti_4Si_3O_(10)) wassynthesized by a combination of solgel and hydrothermal methods. The investigation on ion exchangeproperties shows that Na_4Ti_4Si_3O_(10) exhibits high ad-sorption for cesium, i.e., K_d is as highas 60 000 mL/g in neutral solution. The crystal structure of Na_4Ti_4Si_3O_(10) was characterized byX-ray difiraction (XRD), scanning electronic microscope (SEM), transmission electron microscope(TEM), Raman spectrum, differential thermal and thermogravimetric analysis (DTA/TGA), inductivelycoupled plasma (ICP), and X fluorescence analysis. The compound is tetragonal, P4_2, a=b = 0.781 10nm, c = 1.196 45 nm, alpha =beta = gamma = 90 deg, Z = 4, and R^a = 0.041; Na_4Ti_4Si_3O_(10) has athree dimensional framework consisting of Ti-O octahedral clusters and Si-O tetrahedra. The resultsshow that Na_4Ti_4Si_3O_(10) has good chemical stability, thermal stability, and high cesium ionexchange capacity in the whole pH range.

关键词： ion exchange silicotitanate characterization adsorption

Electrical Conductivity in Soil Extracts: Chemical Factors and Their Intensity

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Pedosphere 2006年第1期16卷 100-107页

作者： LIU Guang-Ming YANG jing-song YAO Rong-Jiang Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China）.

The electrical conductivity （EC） of 1：5 soil-water extract （EC1：5） was studied utilizing path coefficient analysis. The study focused on revealing the main chemical factors contributing to EC of soil extracts and their relative importance. Results showed that the most important factors influencing the EC1：5 of coastal salt-affected soils were the concentration of salt in 1：5 soil-water extract （So）, Cl^-, and the sodium adsorption ratio （SAR）, while effects of pH, CO3^2-, HCO3^, soluble sodium percentage （SSP）, and sodium dianion ratio （SDR） were very weak. Though the direct path coefficients between EC1：5 and SO4^2- , Ca^2＋, Mg^2＋, K^＋, or Na^＋ were not high, influence of other chemical factors caused the coefficients to increase, making the summation of their direct and indirect path coefficients relatively high. Evidences showed that multiple regression relations between EC1：5 and most of the primary factors （So, Cl^-, and SAR） had sound reliability and very good accuracy.

关键词： chemical properties electrical conductivity impact factor soil salinization

Reduction Behaviors of Pellets Under Different Reducing Potentials

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Journal of Iron and Steel Research International 2013年第12期20卷 12-18页

作者： ZUO Xiao-jian WANG jing-song AN Xiu-wei SHE Xue-feng XUE Qing-guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Owing to the change of gas composition in top gas recycling-oxygen blast furnaces compared with tradi- tional blast furnace, many attentions are attracted to the research on iron oxide reduction again. In order to study the influence of H2 and CO on the reduction behavior of pellets, experiments were conducted with H2-N2, CO N2 or H2-CO gas mixtures at 1 173 K by measuring the mass loss, respectively. It was found that the reduction degree in creased with increasing the ratio of H2 or CO in the gas mixture, but the reduction with hydrogen was faster than that with carbon monoxide. The reduction degree could reach 96. 720/00 after 65 rain for the reduction with 50~ H2 ＋ 50% N2, while it is only 53.37~ for the reduction with 50~ COq-50~ N2. The addition of hydrogen to carbon monoxide will accelerate the reduction because the hydrogen molecules are more easily chemisorbed and reacted with iron oxide than carbon monoxide. A scanning electron microscope was used to characterize the structures of reduced samples. Dense structure of iron was obtained in the reduction with hydrogen while the structure of iron showed many small fragments for the reduction with carbon monoxide. At the later stage of reduction with the gas mixtures containing carbon monoxide, the reduction curves showed a descending trend because the rate of carbon deposition caused by the thermal decomposition of carbon monoxide was faster than the rate of oxygen loss. Compared with the reduction with CO-N2 and H2 CO gas mixtures, H2 gas could enhance the carbon deposition while N2 gas would re- duce this phenomenon. The results of X-ray diffraction and chemical analysis demonstrated that the carbons are mainly in the form of cementite （FeaC） and graphite in reduced sample.

关键词： reduction pellet hydrogen carbon monoxide carbon deposition