Kinetic study on the smelting reduction of bottom-injected chromite ore powder by dissolved carbon in iron melt.
スポンサーリンク
概要
- 論文の詳細を見る
Pulverized Chromite ore has been injected into 20kg of carbon containing iron melt from the bottom of crucible, so that the ore is reduced by the dissolved carbon. The effects of temperature, ore injection rate, flow rate of gas and particle size of the ore on the chromium yield and reduction rate have been examined.The chromium yield increases linearly with temperature, decreases with an increase in ore injection rate and decreases linearly with increasing mean particle diameter. The gas flow rate has no effect on the yield. The highest yield of about 100% is obtained with the ore injection rate of less than 20g/min at 1680°C. From the behavior of silicon during the process, it is concluded that the oxygen transport in the melt is the rate determining step. The reduction process can be divided into transitory and permanent reactions. The fraction of transitory reaction is in the range of 60 to 75% at 1500 and 1600°C, and becomes more than 80% at 1680°C. The rate of transitory reaction increases proportionally to the 2/3 power of ore injection rate, and decreases proportionally to the inverse square root of the mean particle diameter. The gas flow rate has not so much effect on the rate. The apparent activation energy is 46.0kcal/mol.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
- The Evolution of Precipitates in Nb-Ti Microalloyed Steels during Solidification and Post-solidification Cooling
- Short Contribution to the Study of the Washing Effect in Electromagnetic Stirrers for Continuous Casting
- Nitrogen Bearing Martensitic Stainless Steels : Microstructure and Properties
- A Two-dimensional Finite Element Thermomechanical Approach to a Global Stress-Strain Analysis of Steel Continuous Casting
- Transformation Behavior and Microstructures in Ultra-low Carbon Steels