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The high temperature thermodynamics of the nickel-cobalt-sulfur and iron-cobalt-sulfur ternary systems

机译：镍钴硫和铁钴硫三元体系的高温热力学

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摘要

The metal saturation line and tie-lines in the nickel-cobalt-sulphur ternary system have been determined between 1273 and 1573 K. Those for the iron-cobalt-sulphur ternary system have also been determined between 1473 and 1623 K. The experiments were conducted by equilibrating the liquid sulphide phase with the metallic alloy phase. The liquid sulphide phase was sampled and chemically analyzed. The alloy phase was analyzed by an electron microprobe. It was found that the metal saturation line data available in the literature for the iron-cobalt-sulphur system were very different from the results of this study.;To measure the partial pressure of sulphur in these two ternary systems, a gas equilibrium technique was used. A gas mixture of H2S/H 2 was used to fix the partial pressure of sulphur. The partial pressures of sulphur in the nickel-cobalt-sulphur ternary system were measured at 1373, 1473 and 1573 K, while in the iron-cobalt sulphur system, they were measured at 1473, 1548 and 1623 K. The attainment of equilibrium was evaluated by several techniques.;The iso-activity contours for Ni, Fe, and Co were determined by application of the Gibbs Duhem equation using Schuhmann's method for ternary systems. The cobalt activity coefficients in dilute solutions of cobalt in the nickel-cobalt-sulphur system were determined. It was found that these systems had a negative deviation from Raoult's law and up to about 0.02 mole fraction of cobalt the activity coefficient of cobalt was constant. The cobalt activities in the iron-cobalt-sulphur ternary system were also determined. At 1548 and 1623 K, cobalt behaved in an ideal manner up to approximately 0.02 mole fraction, above which it exhibited a positive deviation from ideality. At 1473 K, up to approximately 0.05 mole fraction, the activity coefficient of cobalt was constant. From the experimental data, the partial heats of solution for nickel, iron, cobalt, and sulphur were calculated. The integral heats of solution for the Ni-Co-S and the Fe-Co-S ternary systems were determined.
机译：镍钴硫三元体系中的金属饱和线和联系线已确定在1273至1573 K之间。铁钴硫三元体系中的金属饱和线和联系线也已确定在1473至1623 K之间。进行了实验通过使液态硫化物相与金属合金相平衡。对液态硫化物相取样并进行化学分析。通过电子探针分析合金相。结果发现，文献中可用于铁钴硫系统的金属饱和线数据与本研究结果有很大不同。为了测量这两个三元系统中硫的分压，采用了一种气体平衡技术。用过的。使用H2S / H 2的气体混合物来固定硫的分压。镍-钴-硫三元体系中硫的分压分别为1373、1473和1573 K，而铁-钴硫体系中硫的分压分别为1473、1548和1623K。评估了达到平衡的情况Ni，Fe和Co的等活度等值线是通过使用Gibbs Duhem方程，使用Schuhmann方法求解三元体系来确定的。确定了镍-钴-硫体系中钴稀溶液中的钴活度系数。发现这些体系与拉乌尔定律具有负偏差，并且钴的含量高达约0.02摩尔分数时，钴的活性系数是恒定的。还确定了铁-钴-硫三元体系中的钴活性。在1548和1623 K处，钴以理想的方式表现，直至大约0.02摩尔分数，在此之上，钴表现出与理想度的正偏差。在1473 K时，高达约0.05摩尔分数，钴的活度系数是恒定的。根据实验数据，计算出溶液中镍，铁，钴和硫的部分热量。确定了Ni-Co-S和Fe-Co-S三元体系的溶液积分热。

著录项

  • 作者

    Soltanieh, Mansour.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Materials science.;Chemical engineering.;Physical chemistry.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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