When the carbon content in the steel produced by the converter is high,it can reduce the oxygen content in the steel from the source and improve the cleanliness of the steel liquid.But it also brings severe challenges to the dephosphorization of converter.A thermodynamic model based on the theory of ion molecule coexistence(IMCT)for the transition temperature on selective oxidation of carbon and phosphorus in the converter was established to address issues such as shortened dephosphorization time during high carbon tapping and the occurrence of rephosphorization phenomenon in the middle and later stages of smelting.The optimal temperature range for the first slag pouring could be predicted.In order to avoid the phenomenon of rephosphorization in the middle and late period of smelting,the slag should be poured in the appropriate temperature range,and the efficient dephosphorization should be realized in the double-slag blowing process of converter.Combined with the on-site production data and dephosphorization thermodynamics,the influence of the variation of basicity,MgO content and FeO content on the activity of each component was analyzed,the influence on the optimal temperature range was evaluated and the optimal temperature range for the selective oxidation of carbon and phosphorus were revealed.
关键词
转炉炼钢/碳磷选择性氧化/脱磷渣/活度/温度
Key words
converter steelmaking/selective oxidation of carbon and phosphorus/dephosphorization slag/activity/temperature
维普
万方数据