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Evaluation of Component Activity in Molten MnO-SiO_(2)-Al_(2)O_(3)-CaO System with Model SELF-SReM4

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Journal of Iron and Steel Research International 2000年第1期7卷 6-8页

作者： ZHANG Xiao-bing jiang guo-chang XU Kuang-di Shanghai University

A sub-regular solution model SELF-SReM4 used to evaluate activity of the components in a homogeneous region of a quaternary system has been developed in Shanghai Enhanced Laboratory of *** application of SELF-SReM4 in C-Mn-Fe-Si system without the SiC formation has been introduced in previous ***’s application for molten slag of MnO-SiO2-Al2O3-CaO was introduced in this *** provide a basis for the prediction of the metal-slag equilibrium conditions.

关键词： sub-regular solution model component activity m olten slag MnO-SiO2-Al2O3-CaO

Kinetics of Reduction of M nO in Molten Slag with Carbon Undersaturated Liquid Iron

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Journal of Iron and Steel Research International 2000年第1期7卷 1-5页

作者： guo Shu-qiang jiang guo-chang XU Jian-lun XU Kuang-di Shanghai University

The reduction of MnO in molten s lag with carbon undersaturated iron was studied. It was found that the process i s affected by the carbon content of molten metal and the temperature. The higher the carbon content and the temperature, the faster both the reduction and the e merging of the hump on curve of ωFeO, the larger the difference betwe en ωFeO, max and ωFeO, e. The phenomena were explained wi th three-step reaction model.

关键词： MnO kinetics smelting reduction

Experimental Research on Oxidation Refining of Ferrosilicon

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Journal of Iron and Steel Research International 2001年第1期8卷 6-10页

作者： WANG Xin-guo DING Wei-zhong jiang guo-chang XU Kuang-di Shanghai University

This paper explained the mechanism of carbon pickup by ultra low carbon steels during continuous casting and indicated that the major cause of carbon pickup is the contact of the molten steel with the enriched carbon layer of the powder. Forming of the enriched carbon layer is due to the existing of “carbon core”. Accordingly, the measures to reduce the carbon content and amount of the enriched carbon layer were investigated. A kind of new powder has been developed and successfully used to minimize the carbon pickup by ultra low carbon steels during continuous casting.

关键词： ultra low carbon steel continuous casting mold powder carbon pickup

Temperature Dependence of the Raman Spectra of Na_(2)Si_(2)O_(5)

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Chinese Physics Letters 2001年第3期18卷 408-410页

作者： YOU Jing-Lin jiang guo-chang XU Kuang-Di Shanghai Enhanced Laboratory of Ferro-metallurgy Shanghai UniversityShanghai 200072

The microstructures of Na_(2)Si_(2)O_(5) from room temperature up to 1773 K are studied by high temperature Raman *** of complex Raman spectra of crystal and amorphous states(glass and melt)are *** results show that the temperature-dependent Raman spectra clearly indicate phase *** abundance of various kinds of SiO_(4) tetrahedrons(each Si binding to different number of bridging oxygens)can be qualitatively and quantitatively resolved as to be varied obviously with different *** manifests that high temperature Raman spectroscopy provides a useful tool for the microstructure research under high temperature and helps to explain the properties of silicate glasses and melts.

关键词： spectroscopy transition microstructure

A New Mathematical Model for Description of the Liquid Discrete Flow Within a Packed Bed

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Journal of Iron and Steel Research International 2008年第6期15卷 16-23页

作者： WANG Cheng-shan MU Xiao-jing ZHENG Shao-bo jiang guo-chang XIAO Xing-guo College of Materials Science and Engineering Chongqing University Chongqing 400044 China College of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China State Enhance Laboratory of Ferro Metallurgy Shanghai University Shanghai 200072 China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The molten liquid discrete flow inside a packed bed is a typical transport phenomenon in the blast furnace. As for the reported mathematical models presenting the liquid discrete flow within the packed bed, there are some barriers for their application to an engineering scale-up, or some imperfections in model descriptions. To overcome these deficiencies, the effects of the packed bed on the liquid discrete flow have been divided into resistance action and dispersal action, and appropriate descriptions have been given for the two aetions, respectively. Consequently, a new mathematical model has been built to present the liquid discrete flow inside a coke bed in the blast furnace. The mathematical model can predict the distribution of liquid flux and the liquid flowing range inside the packed bed at any time. The prediction of this model accords well with the experimental data. The model will be much better for the simulation of the ironmaking process, compared with the existent model.

关键词： mathematical model liquid discrete flow packed bed blast furnace ironmaking process

Investigation on Dephosphorization of Stainless Steel

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Journal of Iron and Steel Research International 2000年第2期7卷 50-54页

作者： jiang guo-chang guo Shu-qiang ZHANG Xiao-bing ZHUANG Yun-qian XU Kuang-di Shanghai University

The principle of the dephosphorization for stainless steels differs from that of other low alloy steels, which should not only decrease phosphorous content efficiently but also keep the concentration of Cr almost lossless. In these cases, two techniques can be selected. The strategy for oxidational dephosphorization is illustrated in terms of “the selective oxidation among elements ［Cr］, ［P］ and ［C］. So there are two critical W［C］ values. If the real W［C］ locates between these two critical values, the dephosphorization process will be optimized. The optimized region deduced theoretically coincides with the reported range very well. The experiment of reductional dephosphorization was carried out in a sealed reactor. The dephosphorization degree reached 55.4 %—78.0 % when the original phosphorous content was 0.04 %—0.05 %. The processing parameters and the way to avoid pollution were suggested. So this process seems to be possibly adopted in industrial scale.

关键词： dephosphorization stainless steels refining

Temperature Dependence of the Raman Spectra and Phase Transition of Zirconia

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Chinese Physics Letters 2001年第7期18卷 991-993页

作者： YOU Jing-Lin jiang guo-chang YANG Song-Hua MA Jin-chang XU Kuang-Di Shanghai Enhanced Laboratory of Ferro-metallurgy Shanghai UniversityShanghai 200072

A newly constructed high-temperature Raman spectrometer was used to study the temperature-dependence Raman spectra(up to 2023 K)and transformation of zirconia ***-temperature Raman scattering is a useful tool in characterizing the different structures of zirconia and offers the possibility to identify the phase *** shows that monoclinic zirconia transforms to tetragonal phase at about 1440 K during the process of increasing temperature,but shows a lower transformation temperature from tetragonal to monoclinic phase at about 1323 K while the temperature decreased.

关键词： tetragonal monoclinic Transition

Mechanical Modeling and Analysis of Stability Deterioration of Production Well During Marine Hydrate Depressurization Production

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China Ocean Engineering 2024年第2期38卷 338-351页

作者： SUN Huan-zhao chang Yuan-jiang SUN Bao-jiang WANG Kang CHEN guo-ming LI Hao DAI Yong-guo Centre for Offshore Engineering and Safety Technology China University of Petroleum(East China)Qingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China jiangsu Shuguang Oil Tools Co. LtdTaizhou 225532China

Different from oil and gas production,hydrate reservoirs are shallow and unconsolidated,whose mechanical properties deteriorate with hydrate ***,the formations will undergo significant subsidence during depressurization,which will destroy the original force state of the production ***,existing research on the stability of oil and gas production wells assumes the formation to be stable,and lacks consideration of the force exerted on the hydrate production well by formation subsidence caused by hydrate decomposition during *** fill this gap,this paper proposes an analytical method for the dynamic evolution of the stability of hydrate production well considering the effects of hydrate *** on the mechanical model of the production well,the basis for stability analysis has been proposed.A multi-field coupling model of the force state of the production well considering the effect of hydrate decomposition and formation subsidence is established,and a solver is *** analytical approach is verified by its good agreement with the results from the numerical method.A case study found that the decomposition of hydrate will increase the pulling-down force and reduce the supporting force,which is the main reason for the stability *** higher the initial hydrate saturation,the larger the reservoir thickness,and the lower the production pressure,the worse the stability or even *** work can provide a theoretical reference for the stability maintaining of the production well.

关键词： natural gas hydrate production well depressurization production formation deformation stability deterioration

A Molecular Dynamics Simulation of CaSiO3 Melt Under an Electric Field

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Chinese Physics Letters 2000年第4期17卷 279-281页

作者： HUANG Shi-Ping YOU Jing-Pin jiang guo-chang F.Yoshida XU Kuang-Di Shanghai Enhanced Laboratory of Ferro-metallurgy Shanghai Universityj Shanghai 200072 Department of Physics Shiga University of Medical ScienceShiga 520-2192Japan

The results of a molecular dynamics(MD)simulation are presented for CaSiO3 melt under an electric *** two-body interaction potential is adopted in the simulation,with parameters chosen so that the calculated static structure is consistent with results of high temperature x-ray *** is found that the MD results for the heat capacity at constant volume,the self-diffusion coefficient and the electrical conductivity change greatly when the electric field is over 500 MV/*** is given on these results,together with the frequency-dependent electrical conductivity.

关键词： field electrical Molecular