【作者】 戴雨翔； 李晶； 闫威； 韩啸； 宋沈杨；

【Author】 Dai Yuxiang;Li Jing;Yan Wei;Han Xiao;Song Shenyang;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;

【机构】 北京科技大学钢铁冶金新技术国家重点实验室；

【摘要】 转炉冶炼过程中会产生大量炉渣,带走一部分热量和铁资源。采用连续留渣操作不仅可以回收大量渣中铁资源还有利于前期的脱磷。研究发现,随着连续留渣炉数的增多,渣中(%P2O5)含量升高,钢液终点P含量不断提高。由于现场倒渣量控制不合理,新旧渣平衡被打破是渣中(%P2O5)含量富集的主要原因,实际操作过程中,当终点温度在1650℃左右时,连续留渣炉数在6炉左右较为理想。通过热力学及物料平衡计算发现,控制每炉留渣量稳定并随着留渣次数增加而增加石灰加入量,可以实现留渣与新造渣的动态平衡,保持渣中成分趋于稳定,满足终点磷含量的要求,实现多炉连续留渣操作而不用完全倒渣。更多还原

【Abstract】 In the process of converter smelting, a large number of slag will be produced, which will take away a part of the heat and iron resources. Continuous slag retention can not only recover a large amount of iron from slag, but also benefit the early dephosphorization. It is found that the P2O5 content in the slag and the P content at the end point of the molten steel will increase with the increase of the number of the continuous slag retention.The main reason for the enrichment of P2O5 content in slag is that the balance of new and old slag is broken because of unreasonable slag discharge control. In practical operation, when the terminal temperature is about 1650℃, the reasonable number of continuous slag retention is about 6 times. Through thermodynamics and material balance calculation, it is found that the dynamic balance between slag retention and new slag can be realized by controlling the amount of slag retained in each furnace and increasing the amount of lime added with the increase of slag retention times, and the composition of slag tends to be stable. This operation can meet the requirement of phosphorus content at the end point and realize operation of continuous slag retention without complete slag dumping.更多还原