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鋁鎮靜鋼鈣處理后氧化鋁夾雜物變性動力學模型

Kinetic modeling of alumina inclusion modification in Al-killed steel after Ca treatment

  • 摘要: 將Al2O3以及固態的鈣鋁酸鹽均視為未反應核,確定鋁離子在液態鈣鋁酸鹽層的擴散是鋁鎮靜鋼鈣處理后Al2O3夾雜物變性的限制性環節,由未反應核模型建立了Al2O3夾雜物變性的動力學模型,并且通過熱力學分析計算了模型參數.模型結果顯示:隨著Al2O3夾雜物直徑的增大,其完全變性為液態鈣鋁酸鹽的時間大幅延長.鋼液中Ca在一定范圍內增加,不僅在熱力學上有利于Al2O3變性,也使其變性速率迅速增大,但Ca超過一定值時對變性速率促進減弱.溫度升高不利于Al2O3夾雜物變性反應,從而使變性的驅動力減小,對夾雜物變性促進作用不很明顯.模型結果與工業試驗和夾雜觀察結果基本相符.

     

    Abstract: Al2O3 and solid calcium aluminate were considered as un-reacted cores, the diffusion of aluminum cations in the liquid calcium aluminate layer was confirmed as the rate determining step of Al2O3 inclusion modification, and further a kinetic model of Al2O3 inclusion modification was established on the basis of the un-reacted core model. The model parameters were calculated by thermodynamic analysis. Modelling results show that the time of Al2O3 inclusion modification to completely liquid calcium aluminate will be much longer when the size of Al2O3 inclusions increases. Moreover, increasing the Ca content in a reasonable range is beneficial not only to modify Al2O3 inclusions to liquid calcium aluminate from thermodynamics but also to speed the modification process whereas the enhancement weakens when the Ca content exceeds a critical level. Temperature rise is disadvantageous to Al2O3 modification chemical reaction so the driving force of Al2O3 inclusion modification decreases correspondingly, namely temperature rise is not so obvious to speed Al2O3 inclusion modification. Finally, the kinetic model results were verified by industrial trials and they accord with each other very well.

     

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