New Ironmaking Method at Lower Temperature and Higher Oxygen Potential

低温高氧势炼铁新方法

• 批准号: 11355031
• 负责人: NAGATA Kazuhiro
• 金额: $ 23.37万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11355031/
• 关键词: pig iron; low temperature; high oxygen potential; pellet; melting; reduction; meiting; high oxygenpotential; Pellet

Magnetite pellets bearing coal powder were rapidly heated in Ar atmosphere at an elevated temperature. They were reduced and then melted to be molten pig iron during 10 to 15 minutes at the lowest temperature of 1350℃. At the end of reduction, oxygen potential in a pellet was about 1x10^<-14> atm and then phospher and sulfer contents were very low. The same results were obtained for using the mixture of iron ore and coal powders in a alumina crucible.Reaction between graphite and iron proceeded more rapidly to produce molten pig iron than carburization and melting of iron by CO gas.Insite observations of reduction of iron ore mixed with graphite powder were carried out using High temperature X-ray difractometer. When iron ore and graphite powders were milled together and the diameter of graphite was les than 10 μm, the starting temperature of reduction from Fe203 to Fe304 decreased.Single crystal of FeO was deduced by Ar-CO gas mixture and formed thin layer of Fe on the surface. The rate of iron layer formation made rapid higher temperature than 1050℃ and was cyclically proceeded and stopped under the lower partial pressure of CO gas.As the traditional process of lower temperature ironmaking, "Tatara" furnace was investigated.

在高温Ar气氛中对含煤粉的磁铁矿球团进行快速加热。在最低温度1350℃下还原10 ~ 15分钟，熔化成铁水。在还原结束时，球团中的氧势约为1 × 10 - <-14>4大气压，然后磷和硫的含量非常低。在氧化铝坩埚中用铁矿粉和煤粉混合物作还原剂，也得到了同样的结果，石墨和铁的反应比渗碳和CO气体熔化铁更快，用高温X射线衍射仪对石墨粉作还原剂的还原过程进行了现场观察。当铁矿石与石墨粉混磨，石墨粒径小于10 μm时，Fe_（203）还原为Fe_（304）的起始温度降低，在Ar-CO混合气体作用下，Fe_（203）还原为FeO单晶，并在石墨表面形成一薄层Fe。在较低的CO气体分压下，铁层的形成速度使温度迅速升高到1050℃以上，并循环进行和停止。

项目成果

村上太, 福山博之, 永由和宏: "鉄表面におけるCOガス浸炭による液相生成機構"材料とプロセス. 14. 84 (2001)

Futoshi Murakami、Hiroyuki Fukuyama、Kazuhiro Nagayoshi：“铁表面 CO 气体渗碳的液相形成机制”材料与工艺。

T.Murakami.H.Fukuyama and K.Nagata: "Mechanism of Carburizing Followed by Melting of Iron by COGas"材料とプロセス. 13. 981 (2000)

T. Murakami. H. Fukuyama 和 K. Nagata：“COGas 熔化铁后的渗碳机理”，材料与工艺，13. 981 (2000)。

K.Nagata. A.Hniu and T.Suzuki: "Role of "Kobune" in Underground Construction of Tatara Furnace"Tetsu-to-Hagane. 87. 665-672 (2001)

K.永田。

T.Murakami,H.Fukuyama and K.Nagata: "Mechanism of Carburizing and Melting Iron by CO Gas"Iron and Steel Institute of Japan. 41(In press). (2001)

T.Murakami，H.Fukuyama和K.Nagata：“CO气体渗碳和熔化铁的机理”日本钢铁研究所。

村上 太一、福山 博之、須佐 匡裕、永田 和宏: "鉄の浸炭・融解反応に及ぼす表面状態の影響"材料とプロセス. 12. 771 (1999)

Taichi Murakami、Hiroyuki Fukuyama、Masahiro Susa、Kazuhiro Nagata：“表面条件对铁的渗碳和熔化反应的影响”材料和工艺。12. 771 (1999)