铁水预处理时氧化脱磷和预脱硅间的热力学分析

Thermodynamic Analysis between Dephosphorization and Desilication in Molten Iron Pretreatment

从热力学角度分析了铁水预处理时预脱硅和脱磷之间的关系,经理论推导后得到了终点[P]含量和[Si]含量之间关系计算公式。计算发现,一定温度下氧化法脱磷时,终点硅含量越低,其终点磷含量也越低,并提出了铁水预处理脱磷的措施:首先脱硅要脱到较低含量;渣要有较高CaO含量来固定脱磷产物P2O5;脱磷结束后,要尽量扒除冶炼渣,防止温度升高时回磷。

Based on the thermodynamic analysis,the relation between dephosphorization and desilication was researched,and the calculation equation of[P]and[Si]was established by theoretical derivation.The calculation results showed tha[tP]decreases with the decreasing o[fSi]under same temperature.Furthermore,the dephosphorized measures were given in molten iron pretreatment.That is,First,the slag must maintain the higher oxidation ability by escaping silicon to a lower content;In order to fix the dephosphorization product（P2O5）,the slag should have higher content of CaO;We try best to remove the metallurgical slag after the dephosphorization,avoiding the phosphorus returning by the temperature rising.