100t转炉脱磷预处理直炼工艺研究

Research on Hot Metal Dephosphorizing Pretreatment and Direct Steel-Making Process in 100 t Converter

介绍了100 t转炉应用脱磷预处理直炼工艺提高终点命中率的生产实践。冷料比为20%、25%、28%的条件下,优化脱磷、脱碳期供氧和造渣工艺,脱磷期耗氧比从传统工艺的20%-30%提高到30%-50%,脱碳期渣料加入量控制在8-15 kg/t。50炉工业试验结果表明,脱碳期一倒温度达到常规冶炼控制水平,一倒[C]、[P]控制水平明显好于常规冶炼工艺。

The present paper introduces the practice of improving the end point target-hitting by adoption of hot metal dephosphorizing pretreatment and direct steel-making process in 100 t converter.Cold smelting charge ratio was respectively 20%,25%,28%,by optimizing slag making and oxygen blowing process of dephosphorizing pretreatment period and decarburizing period,oxygen consumption rate increased from 20%-30% to 30%-50% than conventional process in dephosphorizing pretreatment period and slag charge was controlled at 8-15 kg/t in decarburizing pretreatment period.Fifty heats industrial test results indicated that temperature controlling at first slag off achieve the level of conventional smelting process,the controlling levels of [C] and [P] were significantly better than conventional smelting process.