Thermodynamics of basic oxides

精炼过程中使用BaO、MgO、Na2O和CaO作为碱性氧化物添加剂。然而，关于这些化合物的热化学数据没有得到很好的研究，因此可能与实际值有相当大的差异。自1993年以来，已经测量了这些化合物的吉布斯生成能。这些测量是用熔融金属和这些化合物在一定条件下的平衡技术进行的。对获得的数据进行了仔细检查，以检查目前提交的数据的适合性。BaO和SRO的数据与JANAF的热化学数据基本相同，而MgO的数据比JANAF的数据低15~22kJ/摩尔。此外，还研究了CaC_2、BaC_2、SrC_2等碳化物的生成吉布斯能，这可以得到更准确的数据。各碳化物的数据略小于其他人的数据，但数值非常接近。这项研究证实了这些化合物的吉布斯生成能数据，为与这些氧化物有关的基础研究和应用研究领域以及炼钢工艺的发展做出了相当大的贡献。

BaO, MgO and Na_2O as well as CaO are being used as basic oxide additives in the steel refining process. However, thermochemical data on these compounds are not well studied and therefore may have considerable discrepancies with real values. Gibbs energies of formation for these compounds have been measured since 1993. These measurements were carried out by equilibrating technique using molten metal and these compounds under a certain condition. The data obtained were carefully examined to check the suitability of those currently referred. Data for BaO and SrO showed almost the same value as those by JANAF thermochemical data, while MgO showed lower by 15 to 22 kJ/mol.Also, the Gibbs energies of the formation for carbides such as CaC_2, BaC_2, SrC_2 were also investigated which can lead to more exact data described above. The data obtained for respective carbides were slightly smaller than those obtained by others, but indicated very close value.This research has delivered considerable contribution to the field of both basic and applied research in relation to these oxide compounds as well as to the development of steelmaking processes in terms of confirmation of the data of Gibbs energies of formation for these compounds.