中文摘要：

提出高碳锰铁预氧化-真空脱碳工艺以制备低碳锰铁。通过热力学计算表明高碳锰铁焙烧氧化过程满足脱碳热力学条件,脱碳反应将进行。脱碳同时锰和铁也被氧化,在873 K分别氧化为Mn_2O_3和Fe_2O_3。温度高于1550 K时碳化锰将与氧化锰反应,真空下反应平衡温度降低,且体系压力越小,平衡温度就越低,当体系压力为2 Pa时,温度高于1030 K就可以进行脱碳。本文在热力学计算基础上开展高碳锰铁预氧化-真空脱碳实验研究,在焙烧氧化实验中,证实了脱碳反应的存在,焙烧3 h有13.17%碳被脱除。在真空脱碳实验阶段,延长保温时间及焙烧时间有利于碳的脱除,当高碳锰铁粉在873 K焙烧3 h,后在15 Pa下于1100℃脱碳4 h,成功制备出含碳0.47%的低碳锰铁。

英文摘要：

The removal of carbon from high-carbon fermmanganese, by a combination of pre-oxidation in air and post-decarburization in vacuum,was theoretically analyzed in thermodynamics and experimentally evaluated with scanning electron microscopy and energy dispersive spectroscopy. The impact of the experimental conditions, including but not lim-ited to the temperatures and times involved in the two stages, pressure,and partial pressure of oxygen,on the carbon removal was investigated. The calculated results show that it is feasible to completely decarburize high-carbon fermman-ganese because Mn and Fe oxidize simultaneously into Mn203 and Fe203 at 873 K and because the solid-solid reaction of manganese carbides and oxides, starting at a much lower temperature （1030 K） at 2 Pa than that in air （1550 K）, removes C in the form of CO.Pre-oxidation at 873 K for 3 h in masting stage removed 13.17% of carbon in the ferroman-ganese;and decarburization at 1373 K for 4 h at 15 Pa fttrther reduced the C-content to below 0.47%.