介绍了100t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 met-al dephosphorizing pretreatment and direct steel-making process in 100t converter. Cold smelting charge ratio was respectively 20 %, 25 %, 28 %, by optimizing slag making and oxygen blowing process of dephosphorizing pretreat-ment period and decarburizing period,oxygen consumption rate increased from 20 %-30 % to 30%-50 % than conven-tional process in dephosphorizing pretreatment period and slag charge was controlled at 8-15kg/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 con-ventional smelting process.
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