共查询到19条相似文献,搜索用时 46 毫秒
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本文系统地分析了几十年来各国学者采用不同的测试和研究方法对诸多的硅酸盐熔体中二氧化的热力学性质的研究结果,结合有代表性的研究工作评价一该研究领域中典型的研究测试方法,其中重点评价了化学平衡法和原电池电动势法用于此类研究的利弊。 相似文献
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用试验的方法测定了符合铅冶炼厂实际的人造熔渣中各组成含量变化时 ZnO 的活度系数,并得出回归方程。高 CaO 渣对脱锌有利,而 Na_2O 的烟化脱锌效果更好。 相似文献
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Al-Mg-Sc合金中组元活度及活度相互作用系数 总被引:4,自引:0,他引:4
以 Miedema二元合金生成热模型及 Toop方程为基础 ,利用元素的基本性质 ,计算了 1 0 73K下 Al-Mg- Sc三元合金溶液中组元的活度及组元间活度相互作用系数。结果表明 ,lnγ0Mg=- 0 .0 0 54;εMg Mg=0 .0 0 2 2 ;εSc Mg=εMg Sc=0 .0 2 8;ρMg Mg=- 0 .0 0 1 3;ρSc Mg=0 .0 1 5;ρMg Sc Mg =- 0 .0 75。 相似文献
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以CaS(1%Y2S3)作固体电解质,W/WS2为参比电极组成化学传感器,对碳饱和铁液中硫的活度进行了测定,实验证明:CaS(1%Y2S3)固体电解质作为定硫传感器是可行的. 相似文献
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有色合金中组元活度相互作用系数的模型计算 总被引:1,自引:0,他引:1
在Miedema二元合金生成热模型基础上,采用规则溶液一级近似理论、自由体积理论以及Toop几何模型,建立了三元系中组元活度相互作用系数的计算模型。计算结果与实验值对比效果良好。 相似文献
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Mn—C—Si系锰基熔体的活度与自由能计算 总被引:1,自引:0,他引:1
实验测定了1673K时Mn-C-Si系熔体中Si对C的溶解度的影响,计算得到锰基熔体中一阶和二阶活度相互作用系数以及C在Mn液中的标准溶解自由能值。 相似文献
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C. H. P. Lupis 《Metallurgical and Materials Transactions B》1974,5(8):1919-1927
Measurements of thermodynamic properties are often performed at saturation of one of the solutes. Exploitation of these data
has given rise to a set of free energy interaction coefficients at constant activity of one solute which are different from
those more familiar coefficients which apply at infinite dilution of all solutes. In the present contribution, enthalpy and
entropy interaction coefficients at constant activity of one solute are defined. Their relationships to other functions and
coefficients of more general usage are established. The use of these relationships is illustrated by showing how the temperature
dependence of the effects of various solutes on the solubility of graphite in liquid iron allows the evaluation of various
heats of solution and enthalpy interaction coefficients. 相似文献
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Elsa Moggia 《中国稀土学报(英文版)》2014,32(10):979-988
This work dealt with the computation of the mean activity coefficients of rare-earth halide aqueous solutions at 25℃, by means of the Quasi Random Lattice(QRL) model. The osmotic coefficients were then calculated consistently, through the integration of the Gibbs-Duhem equation. Using of QRL was mainly motivated by its dependence on one parameter, given in the form of an electrolyte-dependent concentration, which was also the highest concentration at which the model could be applied. For all the electrolyte solutions here considered, this parameter was experimentally known and ranged from 1.5 to 2.2 mol/kg, at 25 ℃.Accordingly, rare- earth halide concentrations from strong dilution up to 2 mol/kg about could be considered without need for best-fit treatment in order to compute their osmotic and mean activity coefficients. The experimental knowledge about the parameter was an advantageous feature of QRL compared to existing literature models. Following a trend already observed with low charge electrolytes,a satisfactory agreement was obtained with the experimental values for all the investigated rare-earth chlorides and bromides. For the sake of compactness, in this work the considered rare-earth halides were all belonging to the P63/m space group in their crystalline(anhydrous) form. 相似文献
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Sulphide capacity measurements of slag with MgO content up to 18?mass% were carried out at 1713, 1743 and 1773?K to obtain reliable data for the blast furnace process. In the measurement, the slag is equilibrated with copper at a controlled oxygen partial pressure for 24?h. The sulphide capacities are calculated based on the sulphur analyses for both slag and copper. 相似文献
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WANGQing-xiang ZHOUJian-jian DUXiao-jian 《钢铁研究学报(英文版)》2005,12(1):5-8
SymbolList a(i) ———Activityofconstituentiinslag ; CP———Phosphatecapacityofslag ; eji———Interactioncoefficientofconstituentjtoconstituenti; f[i] ———Activitycoefficientofconstituentiinmelt; Km———Equilibriumconstantofreactionm ; 相似文献
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Modified quasi-regular solution model has been available based on the sub-regular solution model and quasi-regular solution model in this article.The three parameters of this model are set by the computer-aided analysis based on the experimental data of activity at two different temperatures.Seven binary molten slag systems in the whole concentration are calculated by application of the model and the average relative error is within 10%.Ten binary molten slag systems presenting saturation concentration are ... 相似文献
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Oxidation state of titanium was determined in CaO‐SiO2‐TiOx slags in the composition range 25‐53 percent CaO, 27‐46 percent SiO2, 10‐55 percent TiOx at 1873K using gas equilibration method. In the experiments, slags with different titanium oxide contents were equilibrated with a known carbon monoxide and carbon dioxide ratio. The results were used to determine the Ti3+ and Ti4+ contents as well as the activity coefficient ratio of corresponding oxides in the slag. The dependence of the activity coefficient ratio as a function of oxygen partial pressure was determined. 相似文献
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蠕化铁水共晶度的测量对蠕铁的生产至关重要,蠕化铁水质量的在线检测主机包括蠕化铁水共晶度的测量,蠕化铁水活性镁含量的测量和蠕化铁水的共晶再辉温度测量。 相似文献