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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。
Proposed high-carbon ferromanganese pre-oxidation - vacuum decarburization process to prepare low-carbon ferromanganese. Thermodynamic calculation shows that the calcination and oxidation of high-carbon ferromanganese satisfy the conditions of decarburization and the decarburization reaction will proceed. At the same time, manganese and iron are also oxidized and oxidized to Mn_2O_3 and Fe_2O_3 respectively at 873K. When the temperature is higher than 1550 K, the manganese carbide will react with the manganese oxide and the equilibrium temperature of the reaction decreases under vacuum. The smaller the system pressure is, the lower the equilibrium temperature is. When the system pressure is 2 Pa, the temperature is higher than 1030 K carbon. In this paper, based on the thermodynamic calculation, a high-carbon ferromanganese pre-oxidation-vacuum decarburization experiment is carried out. In the calcination oxidation experiment, the existence of decarburization reaction is confirmed. After 13 h of calcination, 13.17% of carbon is removed. In the vacuum decarburization experiment stage, prolonging the holding time and roasting time are favorable for the removal of carbon. When the high-carbon ferromanganese powder is roasted at 873 K for 3 h and then decarburized at 1100 Pa in 4 Pa for 4 h, Carbon 0.47% low-carbon ferromanganese.