Thermodynamics of basic oxides

BaO、MgO、Na_2O和CaO是炼钢过程中常用的碱性氧化物添加剂。然而，这些化合物的热化学数据没有得到很好的研究，因此可能与真实的值有相当大的差异。自1993年以来，已经测量了这些化合物的生成吉布斯能。这些测量是在一定条件下用熔融金属和这些化合物通过平衡技术进行的。对所获得的数据进行了仔细的审查，以检查目前提到的数据是否适用。BaO和SrO的数据与JANAF的热化学数据基本一致，而MgO的数据则低15 ~ 22 kJ/mol。此外，还研究了CaC_2、BaC_2、SrC_2等碳化物的生成吉布斯自由能，从而得到了更精确的数据。相应的碳化物所获得的数据是略小于那些所获得的由别人，但表示非常接近的value.This研究提供了相当大的贡献领域的基础和应用研究有关这些氧化物化合物以及炼钢工艺的发展方面的确认这些化合物的吉布斯生成能的数据。

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.