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Solubility of Ba in Liquid Iron and Interaction Effect of the Third Elements

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International Journal of Minerals,metallurgy and Materials 2000年第2期14卷 82-85页

作者： Bo Song Qiyong Han Chenming zhang(metallurgy school, {3. of Science and technology beijing, beijing 100083. china) metallurgy school University of Science and Technology Beijing Beijing 100083 China

Experiments were carried out at 1873.K in a double-temperature zone furnace using vapor pressure method. The equilibriumtests of bedum vapor with liquid iron were conducted in CaO crucibles sealed in a Mo chamber. As a result, the experiments obtainedthe relation between the dissolved content of Ba in liquid iron and the vapor pressure of Ba and the standard Gibbs energies for the re-actions Ba(g)=[Ba] and Ba(l)=[Ba].

关键词： Ba dissolution equilibrium liquid iron interaction parameter

Sol-gel Preparation Copper-cadmium Halide DopedPhotochromic Glass Coating on Plate Glass

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International Journal of Minerals,metallurgy and Materials 2000年第1期14卷 34-37页

作者： ShiyongLuo Jiayun zhang Jixiang Liu metallurgy school, {3. of Science and technology beijing, beijing 100083. china Wuhan {3. of technology, Wuhan 43.070, china Univ Sci & Technol beijing Met Sch Beijing 100083 Peoples R China Wuhan Univ Technol Wuhan 430070 Peoples R China

Copper-cadmium halide doped photochromic glass coating on plate glass has been prepared by a sol-gel process. The sample shows reversible photochromic effect. The results of X-ray diffraction (XRD) and infrared (IR) spectrum investigations indicate that the photochromic phase of tile coating is CuBr_xCl_(1-x), solid solution, and that the structure network of the coating is connected with the bonds of Si-O-Si, Si-O-B and Si-O-Al.

关键词： photochromic glass coating sol-gel photochromic phase, structure network

Pulsation Treatment on the Modification of Crystal with Cold Simulation

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International Journal of Minerals,metallurgy and Materials 1999年第1期13卷 20-23页

作者： jianzhong Wang Yong Tang Daqiang Cang Jiaquan zhang(metallurgy {3., university of Science and technology beijing, beijing 100083. china) metallurgy school University of Science and Technology Beijing Beijing 100083 China

Since the separation of crystal of KCl saturated aqueous is similar to the crystallization of liquid metals, the melts nucleation can be simulated by the experiment of the crystal of salt aqueous solution. In this experiment pulsation treatment was imposed on KCl saturated aqueous in order to study the effect of pulsation treatment on crystallization in the salt solution, and the influence of different pulsation treating time, super-heating and bine of prescription were investigated. The results show that it is possible to modify the crystallization over satured solution temperature and the degree of under-cooling for salt crystal separation was reduced by applying pulse treating on KCl saturated aqueous solution. In addition, this technology may generate embryos for nucleation even at the temperature over melting point or satured solubility.

关键词： saturated aqueous solution pulse modification treatment nucleation, crystal

CALCULATING MODELS OF MASS ACTION CONCENTRATIONSFOR MATTES (Cu_2S-FeS-SnS)INVOLVING EUTECTIC

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Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 392-397页

作者： J. zhang (Department of metallurgy, university of Science and {3. beijing, beijing 100083. china) Univ of Science and technology Beijing Beijing China

Based on the facts that cations and anions of molten salts and binary basic oxide solid solutions do not separate from each other as well as that the electric conductivities of mattes are greater than that of salts and basic oxide solid solutions, the calculating models of mass action concentrations for binary and ternary mattes involving eutectic have been formulated. The results of calculation agree well with the values measured;this in turn shows that the calculating models can reftect the structural characteristics of the mattes concerned.

关键词： matte activity eutectic mass action concentration

Effects of Temperature and [S] on the Kinetics of Nitrogen Removal from Liquid Steel

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Journal of Materials Science & technology 2001年第2期17卷 233-236页

作者： Jie FU, Shixiang ZHOU, Ping WANG, Lin DI and jian ZHU metallurgy school, {3. of Science and technology beijing, beijing 100083. china Univ Sci & Technol beijing Met Sch Beijing 100083 Peoples R China

The kinetics of denitrogenation from liquid steel was studied by using an oxygen-nitrogen analysis system(LECO TC-43.) under 1600 degreesC similar to 2813.degreesC conditions. The results show that when [S]=0.005%, nitrogen removal was controlled by nitrogen transfer in liquid diffusion layer, when [S]=0.012% and 0.140%, it was controlled by both nitrogen transfer in liquid diffusion layer and the chemical reaction at the liquid-gas interface below 2250 degreesC, and by nitrogen transfer in liquid diffusion layer under 2250 degreesC similar to 2813.degreesC conditions. The activation energy E-a was 57 kJ/mol for 0.0050%[S], 95 kJ/mol for 0.012%[S], 165 kJ/mol for 0.140%[S]. The resistance of sulphur on nitrogen removal decreased with the temperature rose, and disappeared at 263. degreesC. Based on the results obtained, it has been answered why the nitrogen in liquid steel can be decreased rapidly by carbon-oxygen reaction under very high oxygen and sulphur content conditions during the BOF, EAF, VOD and AOD steelmaking processes.

关键词： Effects of Temperature and on the Kinetics of Nitrogen Removal from Liquid Steel

Algorithm for Computation of Unstructured Real Stability Radius and Its Applications

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International Journal of Minerals,metallurgy and Materials 1998年第4期12卷 245-250页

作者： Xiaodan zhang Lequan Min(Applied Science school, university of Science and {3. beijing, beijing 100083. china) Applied Science school University of Science and Technology Beijing Beijing 100083 China

An algorithm for the computation of the unstructured real stability radius of high dimensional linearsystem is presented. Using the accurate formula of the real stability radius of 2-dimensional system linear systemchecks the algorithm. The result shows that the algorithm is reliable and efficient. As applications, the unstructuredreal stability radii of 2-dimensional Chua's circuit and 3.dimensional piecewise-linear system are calculated, thedynamical orbits of the corresponding perturbed systems are simulated.

关键词： lincar systems stability robustness parameter perturbation computational methods

Nonclassical Plane-crystallographic Groups and Their Applications IV

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International Journal of Minerals,metallurgy and Materials 1998年第4期12卷 228-232页

作者： Lequan Min Xaodan zhang(Applied Science school, school,{3. of Science and technology beijing, beijing 100083.china) Applied Science school University of Science and Technology Beijing Beijing 100083 China

Eight kinds of nonclasslcal periodic lattices with locally 8-fold rotational symmetries are *** can be described via nonclassical Planc-crystallographic groups. The periodic lattices may be interpreted bythe projections on the plane of the corresponding unit cells consisting of embedding polyhedrons, respectively. TheFourier-transform patterns of the Periodic lattices have striking approximate'8-fold rotational symmetries', some ofwhich are similar to those displaying in the electrton-diffraction patterns of so-called quasicrystals.

关键词： nonclasslcal crystallographic groups locoally 8-fold symmetry Fourier-transform patterns, quasicrystals

Oxidizing Capability of Refining Slags Containing BaO

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International Journal of Minerals,metallurgy and Materials 2000年第4期14卷 251-255页

作者： Gang Lu, Guoguang Cheng, Bo Song, Pei Zhao (metallurgy school, university of Science and {3. beijing, beijing 100083. china) metallurgy school University of Science and Technology Beijing Beijing 100083 China

According to the coexistence theory of slag structure melts, the oxidizing capability of the refining slag CaO-MgO-FeO- A12O3.iO2 is studied and the relationship between the mass action concentration of FeO (NFeO) and the activity of FetO (αFetO) for this slag is found to be as NFeo=0.656 1 αFetO. Furthermore, the calculating model of oxidizing capability of the refining slag BaO-CaO-MgO- FeOA12O3.SiO2 is established. A satisfactory result is obtained when using the above oxidizing capability relationship to calculate the desulphurizing capability of such refining BaO-slags.

关键词： secondary refining slag oxidizing ability calculating model metallurgy

Cleaning of Chromate Manufacture Process

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International Journal of Minerals,metallurgy and Materials 2000年第2期14卷 132-134页

作者： Xing Zou Yi zhang(Applied Science school, university of Science and {3. beijing, beijing 100083. china)(Institute of Engineering Chemistry and metallurgy, Chinese Academy of Sciences, beijing 100080, china) Applied Science school University of Science and Technology Beijing Beijing 100083 China Institute of Engineering Chemistry and metallurgy Chinese Academy of Sciences Beijing 100080 China

Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 3. to 110℃. The optimized conditions to separate sodium chromate from NaOH inleached solution are resolved. It is first found the method to efficiently separate sbdium chromate from NaOH andsodium altuninate in crude sodium chromate. Bench-scale studies on the separating are performed. Finally, goodseparation results are achieved.

关键词： chromate separation clean process