Wettability of Molten Steel／Na2O-Li2O-SiO2-B2O3 Slag System

Thewettability phenomenonbetweenmoltensteelandmetallurgicalslagisoneofthemostimpor tantsubjectsinsteelmakingprocess.Theformationofsteel slagemulsions ,andtheformationandelimina tionofnon metallicinclusionsinsteelaretypicalex amples.Theinterfacialtensionan…     

Optical Spectroscopy of Er^3＋ and Er^3＋/Yb^3＋ Co-doped Bi2O3-GeO2-B2O3-ZnO Glasses

The （60 - x）Bi2O3 - xGeO2-30B2O3-10ZnO （x = 5, 10, 20, 30 molar percent） glasses doped with Er^3＋ and Er^3＋/Yb^3＋ were fabricated using the melting method. The thermal stability of the glasses was studied with their DTA curves. The results show that the difference between the glass transition temperature and the crystallization onset temperature increases with the increase of GeO2 content, indicating that the thermal stability of the glass has become better. The absorption spectra were recorded and the stimulated emission cross sections were calculated using the McCumber theory. The Ω2, O4, and Ω6 parameters,the transition probability, the radiative lifetime, and the fluorescence branch ratio of Er^3＋ for optical transition were calculated from their absorption spectra in terms of reduced matrix U^（t）（λ = 2, 4, 6） character for optical transitions. The infrared emission of Er^3＋ was measured upon excitation with 970 nm light and the full width at half-maximum （FWHM） was estimated from the emission spectra. The pumping efficiency and the intensity of the emission at the 1.54 μm band of Er^3＋ were enhanced considerably by co-doping Yb^3＋ .     

钠电正极材料Na2/3Ni1/3Mn2/3O2的合成工艺参数研究

通过高温固相法制备了钠离子电池正极材料Na2/3Ni1/3Mn2/3O2,并对Na2/3Ni1/3Mn2/3O2的合成工艺参数进行了研究.通过对不同条件下制得的正极材料进行物化性质与电化学性能的表征,确定材料的最佳合成温度为900℃,最佳保温时间为12 h.在2～4.5 V电压区间内,0.2 C倍率下,材料首周的放电容量为110 mAh·g-1,100周充放电后的可逆容量为86 mAh·g-1,容量保持率达78.1％.     

SO42-/TiO2-La2O3催化剂催化合成苹果酯-B

制备了稀土改性固体超强酸SO42-/TiO2-La2O3催化剂。以SO42-/TiO2-La2O3为多相催化剂,对以乙酰乙酸乙酯和1,2-丙二醇为原料合成苹果酯-B的反应条件进行了研究。实验表明:固体超强酸SO42-/TiO2-La2O3是合成苹果酯-B的良好催化剂,最佳反应条件为:n(乙酰乙酸乙酯)∶n(1,2-丙二醇)=1∶1.5,催化剂用量为反应物料总质量的1.5%,环己烷为带水剂,反应时间1.5h,反应温度85℃～110℃。在上述条件下,苹果酯-B的收率可达88.6%。     

高Al2O3炉渣性能的研究

根据对高三氧化二铝炉渣性能的实验室研究结果分析，初步找出了炉渣成分对高三氧化二铝炉渣性能的影响及其变化规律,提出了合适的渣系组成及高炉冶炼的相应对策。     

Effect of Lu2O3 on Charge/discharge Performances of Spherical Nickel Hydroxide at High Temperature

Nickel-metal hydride （Ni/MH） batteries are one of promising batteries for electric vehicle applications, but at high temperature the charge efficiency of nickel electrode is very low. In order to improve the high-temperature-efficiency of nickel electrode, spherical nickel hydroxide mixed with various ratios of Lu2O3 was used as active material of pasted nickel electrodes. The results of charge/discharge experiments, cyclic voltammetric measurements and XRD characterizations have shown that after addition of Lu2O3, the oxygen evolution overpotcntial is elevated much, the charge efficiency of nickel electrode at high temperature is greatly improved and the content of β-NiOOH phase increases in charged electrodes. In addition, the mixed ratio of Lu2O3 has different effects on high temperature performances of nickel electrode at different charge/discharge currents, 3.5 % is the optimum mixed ratio, and the action of Lu2O3 on high temperature electrochemical behaviors is more apparent when nickel electrodes are charged at small current than large current.     

X射线荧光光谱法测定焦炭、焦粉灰分中T.Fe、SiO2、Al2O3、CaO、MgO、K2O和Na2O的含量

介绍了采用荧光光谱法测定焦炭、焦粉灰分中T．Fe、SiO2、Al2O3、CaO、MgO、K2O和Na2O含量的实验条件，与化学法相比，该方法简便快捷，测量精密度高，准确性好。     

Effects of Y2O3 on Thermal Shock of Al2O3／TiCN Composites

Advancedstructuralceramics ,suchasoxides ,nitridesandcarbides ,havebecomepreferredrefracto rymaterialsforaviation ,spaceflight ,energyandmet allurgybecauseoftheirchemicalstability ,creepresis tanceandhightemperaturestrength .Buttheyareaf fectedgreatlybyte…     

济钢1#1 750 m3高炉降低渣中Al2O3含量的操作实践

针对1^#1750m^3高炉渣中Al2O3高,使炉渣黏稠,影响高炉顺行的情况,通过加辅料,成功地控制渣中Al2O3小于16％,保持了炉料结构相对稳定,改善了高炉操作技术指标,加辅料后的第2月,利用系数达2．538t／（m^3·d）,入炉焦比为346kg／t。     

适应高Al2O3炉渣冶炼的高炉炉渣结构调整

高炉炉渣中Al2O3含量高(15%)时造成炉渣流动特性变差,为此不适当的对策给生产操作带来危害。通过对炉渣四大组元的系统试验研究,提出定量调整其他各炉渣组元的比例,合理匹配各组元,关键是关注1 500℃下炉渣黏度变化和熔化性温度的控制,这样向高Al2O3生产转换不会有大的障碍。还通过国内外高炉的炉渣特点对比,提出合理炉渣结构的调节途径,是高Al2O3炉渣生产的切实可行的技术路线。     

Study of Interfacial Tension between Molten Steel and Na_2O-Li_2O-SiO_ 2-B_2O_3 Slag

Ｔｈｅｒｅａｒｅｍａｎｙｃａｓｅｓｗｈｅｒｅｔｈｅｉｎｔｅｒｆａｃｅｂｅ ｔｗｅｅｎｍｏｌｔｅｎｍｅｔａｌａｎｄｓｌａｇｐｌａｙａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｔｈｅｓｔｅｅｌｍａｋｉｎｇ ｐｒｏｃｅｓｓｓｕｃｈａｓｔｈｅｆｏｒｍａｔｉｏｎ ,ａｇｇｒｅｇａｔｉｏｎ ,ｄｉｓｔｒｉｂｕｔｉｏｎａｎｄｓｉｚｅｏｆｎｏｎ ｍｅｔａｌｌｉｃｉｎ ｃｌｕｓｉｏｎｓｉｎｓｔｅｅｌ ,ｆｏｒｍａｔｉｏｎｏｆｍｅｔａｌ ｉｎ ｓｌａｇｅｍｕｌｓｉｏｎｉｎｔｈｅＢＯＦｐｒｏｃｅｓｓａｎｄｓｌａｇ ｍｅｔａｌｒｅａｃｔｉｏ…     

Density of Liquid Steel over Temperature Range of 1 803-1 873 K

The density of three kinds of liquid steel was measured by a modified sessile drop method over the temperature range of 1 803-1 873 K. It is found that the density of liquid steels decreases with increasing temperature and carbon content in steel. Both of the density and its absolute temperature coefficient of studied steels are smaller than the literature values of pure iron. The molar volume of the steels increases with increasing temperature.     

CaO-SiO_2-B_2O_3熔渣的热力学计算模型

根据CaO-SiO2、CaO-B2O3和SiO2-B2O3二元相图确定了熔渣的结构单元,利用熔渣的分子离子共存理论建立了CaO-SiO2-B2O3三元熔渣活度模型。通过对模型求解,可以计算出熔渣中CaO、SiO2、B2O3、CS、C2S、C3B、C2B、CB和CB2的组分活度。分析了熔渣碱度、B2O3含量及温度对熔渣组分活度的影响,其中熔渣碱度的影响最大,B2O3含量的影响次之,温度的影响最小。     

Model for Evaluating Density of Molten Slag With Optical Basicity

 A new model based on optical basicity is proposed to estimate the density of molten slag. Successful applications to the density calculations of CaO-Al2O3-SiO2 and Al2O3-CaO-MgO-SiO2 slag systems show that this model works well. It is also found that the ionic band percentage of “M-O” band in MOx oxide is the intrinsic origin of the phenomenon that the slag with a high optical basicity has a large sensitivity to temperature.     

Comparison of Surface Tension Measured Values for Molten Tin at Different Oxygen Potentials

The surface tension of molten tin has been determined by a set of a self‐developed digital equipment with the sessile drop method at an oxygen partial pressure of 1.0×10^?6 MPa at different temperatures. The dependence of surface tension of molten tin on temperature was discussed as well. Based on the summarized relationships of the surface tension of molten tin to temperature and oxygen partial pressure reported in the literature, the reasons for the differences in those reported data were analysed. The emphasis was placed on the comparison of surface tension of the same molten tin sample measured by using different equipments according to the sessile drop method. Results of the comparison indicate that the measurement results obtained with the sessile drop method under similar experimental conditions are coincident, and the self‐developed digital equipment for surface tension measurement has a higher stability and accuracy. The relationships of surface tension of molten tin and its temperature coefficient with temperature and oxygen partial pressure were also elucidated from the thermodynamic analysis in this paper.     

Measuring and Modeling of Density for Selected CaO-MgO-Al2O3-SiO2 Slag With Low Silica

 The densities of the selected quaternary CaO-MgO-Al2O3-SiO2 slag with low silica were measured by the Archimedean method in a wide temperature range from 1773 to 1873 K. Nine different slag compositions were chosen based on three different levels of CaO content and three different levels of SiO2 content. wMgO was equal to 7.0%. wCaO were varied from 40.04% to 50.64%, for wSiO2=10.25%-20.70%. The effects of temperature, SiO2 content and optical basicity were studied. It is shown that density decreases approximately linearly with an increase in temperature. Under the same CaO content, the density decreases with increasing of SiO2 content, and increases with optical basicity increasing. Based on the experimental data as the boundary of the homogenous phase region predicated by FACTSAGE software, the mass triangle model is used to calculate the density of selected limited homogenous phase region. The results showed that the mass triangle model works well.     

CaO—SiO2—Na2O三元渣系的挥发率

采用失重法对ＣａＯ－ＳｉＯ２－Ｎａ２Ｏ三元渣系在不同温度下的挥发率进行了测量。结果表明，在烧结温度下，低熔点渣的挥发率呈三段式变化，而高熔点渣无此特性；当修正碱度Ｒ′＞１、成分固定时，只有在温度超过其流动温度时才能显著提高挥发率；温度一定时，挥发率随着碱度Ｒ及Ｎａ２ＣＯ３含量的增加而提高；当Ｒ′＜１时，温度、碱度、Ｎａ２ＣＯ３含量对挥发率的影响都不大。     

CaO-Al2O3基精炼渣对钢液脱氧的影响

在MoSi2炉上用二次正交回归实验方法进行了CaO-Al2O3基精炼渣对钢液脱氧影响的实验研究，发现精炼渣与钢中溶解氧的平衡时间为20～30min、平衡溶解氧含量为0.008%～0.0012%，并得到了精炼渣在不同成分下的钢液全氧含量，另外，通过二次正交回归处理，得到了钢液全氧含量与精炼渣的光学碱度，渣中Al2O3含量和CaF2含量之间的关系式；并发现如下规律：随着精炼渣光学碱度的提高，钢液全氧含量几乎呈直线减小；在用铝脱氧的条件下，钢液全氧含量基本上随精炼渣中Al2O3含量的增加而增大，随着精炼渣中CaF2含量的增加，钢液全氧含量呈先增大，后减小的趋势。本实验条件下最佳的渣系组成为CaO57.29%，Al2O39%，MgO10%，SiO28.71%，CaF215%。