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轉爐煉鋼前期石灰石分解及CO2氧化作用的熱力學分析

Thermodynamic analysis of limestone decomposition and CO2 oxidation effect in the early stage of BOF steelmaking

  • 摘要: 應用熱力學方法,對轉爐煉鋼前期高碳低溫鐵水條件下石灰石分解及CO2氧化作用進行了分析,推導出了CO2分壓(pCO2)和高碳低溫區域碳活度系數fC,%的求解方程.結果表明:石灰石中CaCO3在高碳低溫的鐵水面附近,其分解反應平衡溫度比標準狀態時低得多,隨著吹煉過程中爐溫上升其反應趨勢增大,CO2在轉爐煉鋼吹煉初期與C、Si、Mn和Fe(l)的反應都可以自發進行,其排列次序與各元素被O2氧化的反應相同;在高碳低溫鐵水條件下pCO2值非常小,轉爐煉鋼初期pCO2在0.002 2~0.000 5pΘ左右,因此可以認為石灰石分解產生的CO2會全部參與鐵水氧化反應.

     

    Abstract: The computational formulas of CO2 partial pressure pCO2 andC activity coefficient fC,% under the condition of high carbon concentration and low temperature were derived from the analysis of limestone decomposition and CO2 oxidation in the early stage of BOF steelmaking by the thermodynamic method. It is shown that the equilibrium decomposition reaction temperature of calcium carbonate in limestone near the surface of molten iron with high carbon concentration and low temperature is much lower than that under the standard state. The reaction tendency of limestone decomposition increases as the furnace temperature rises,and the reactions of CO2 withC,Si,Mnas well as Fe(l) can occur spontaneously as the same reaction sequence of oxidation by O2 in the early stage. The value of pCO2 under the condition of high carbon concentration and low temperature is very small,near the value of 0.002 2 to 0.000 5pΘ in the early stage of BOF steelmaking,so all of the CO2 produced from the limestone decomposition reaction can be thought to participate in the oxidation reaction of molten iron.

     

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