摘要：本课题选用化学平衡法对含FeO渣中FeO活度的影响进行了实验研究，为确定车用高锰钢冶炼时的工艺流程及各工序步骤的关键工艺参数奠定坚实的理论基础。通过实验，测定出反应的平衡时间为12小时。在混合气体的分压比PCO：PCO2=150:1时，求出γFeO。然后得出lgγFeO与xFeO的关系式为 。因此可知，在含有FeO的渣中，MnO的含量一定时，碱度一定时，FeO的活度系数随着FeO含量的增大而减小。而当考虑炉渣中（FeO）的影响时，又可以得到lgγFeO与xFeO的关系式为： 。故得到当考虑（MnO）存在时，γFeO会减小更多。57449

毕业论文关键字： 化学平衡法；高锰钢；活度；活度系数

The research of FeO activity in slag containing FeO

Abstract：The experiments based upon chemical equilibrium method were fulfilled to study the influence of FeO content to FeO activity. The object of this experiments is to determine key process parameters of high manganese steel for vehicle both in melting process and each process step, finally to lay a solid theoretical foundation. According to the experiments, the equilibruim time has been resulted as 12 hours. Partial pressure ratio of CO:CO2 is 150:1, then finds out

 γFeO. Next to draw the relation between lgγFeO and xFeO,  . We can draw the conclusion that in the slags containing FeO, when the FeO content and alkalinity are changeless, FeO activity coefficient decreases with the increase of the FeO content. And when considering the influence of (FeO) in the slag,we can find out the relation between lgγFeO and xFeO: . We can judge that the activity coefficient would decrease more when MnO exists.

Key Words: Chemical equilibrium method; High manganese steel; Activity; Activity coefficient

目 录

1 综述 1

1.1 汽车用钢的最新研究 1

1.1.1 汽车用钢的发展状况 1

1.1.2 汽车用钢的要求 2

1.1.3 TWIP钢的现状 3

1.1.4 TWIP钢的成分特点和性能特征 3

1.2 TWIP钢的冶炼 5

1.2.1 炉渣 5

1.2.2 碱度 6

1.2.3 氩氧炉(AOD)冶炼 6

1.2.4 真空吹氧脱碳炉(VOD)冶炼 8

1.2.5 AOD与VOD比较 9

1.3  FeO活度的研究 10

1.3.1 活度的概念 10

1.3.2  FeO的活度测定方法 10

2 研究目的及意义 13

2.1 研究目的 13

2.2 研究意义 13

3 实验部分 14

3.1 实验方案及过程 14

3.1.1 实验设备 14

3.1.2 原料试剂 15

3.1.3 实验室注意事项 15

3.1.4 平衡时间的确定 15

3.1.5 渣中组分活度系数和活度测定 15

4 实验结果与分析讨论 17

4.1 实验数据 17

4.2 活度系数的计算 17

5 结论