马钢300t转炉挡渣工艺的优化与改进

Optimization and Improvement of 300t Converter Skimming Process in Masteel

为减少出钢过程下渣、提高钢水质量及合金元素收得率,马钢第四钢轧总厂对300t转炉原气动挡渣工艺进行了优化,采用了挡渣镖法和气动挡渣法相配合的方法。现挡渣镖法挡渣成功率达到98%,出钢下渣量减少了30%以上,平均回磷量可控制在0.003%以下,同时提高了钢水收得率,改善了溅渣护炉和后续精炼效果,取得了较好的经济效益。

To reduce the slag outflow during converter＇s taping, improve the quality of liquid steel, , and increase the yield of alloy elements, the original pneumatic slag - stopping process for 300t converter is optimized by applying the skimming dart combined with the pneumatic slag - stopping technology in No. 4 Steel - making and Rolling Plant General, Ma ~nshan Iron and Steel Co. , Ltd. Through the skimming dart technology, the successful slag - stopping reaches to 98%, the quantity of slag outflow during taping is reduced by more than 30%, and the average re - phosphating ratio can be controlled under 0.003 %. Meanwhile, the yield of liquid steel is increased and slag - splashing and subsequent refining are improved. As a result, better economic benifits are gained.