摘要
针对马钢65 t转炉加入铁矿石替代部分废钢后冶炼操作和炼钢成本发生变化,通过测算铁矿石与废钢的冷却效应,得出1 kg铁矿石冷却效应为3.76 kg废钢的冷却效应。在此基础上,分别研究了铁矿石加入量对转炉吹炼的影响,以及熔池温度和铁矿石密度对铁矿石还原率的影响。结果表明:熔池温度在1550℃时,铁矿石还原率达到最大值65.23%,铁矿石加料时机应选择在吹炼中前期加入;铁矿石密度越小,越有利于铁矿石还原,合理的铁矿石密度范围为3.0~4.0 g·cm^(-3)。通过控制铁矿石加入量和加入时机,以及优化转炉冶炼过程操作,提高了吹炼的平稳性,铁矿石用量由7.46 kg/t提高至17.91 kg/t,转炉终渣主要成分变化不大,终点磷含量符合内控要求,转炉炉况未见明显侵蚀,实现了转炉炼钢降本增效目标。
In view of the change of smelting operation and steelmaking cost after adding iron ore to replace part of scrap in 65 t converter of Maanshan Iron and Steel Co.,Ltd.,the cooling effect of 1 kg iron ore is 3.76 kg scrap by calculating the cooling effect of iron ore and scrap.On this basis,the effects of iron ore addition on converter blowing,as well as the effects of bath temperature and iron ore density on iron ore reduction rate were studied respectively.The results show that when the bath temperature is 1550℃,the reduction rate of iron ore reaches the maximum value of 65.23%,and the iron ore feeding time should be selected in the early stage of converting;The smaller the density of iron ore,the more conducive to the reduction of iron ore.The reasonable range of iron ore density is 3.0~4.0 g·cm^(-3).By controlling the amount and timing of iron ore addition and optimizing the operation of converter smelting process,the smoothness of converting is improved.The amount of iron ore is increased from 7.46 kg/t to 17.91 kg/t,the main composition of converter final slag changes little,the end phosphorus content meets the internal control requirements,and the converter condition is not significantly eroded,realizing the goal of reducing costs and increasing benefits of converter steelmaking.
作者
邓南阳
潘军
周军
赵滨
张文英
DENG Nanyang;PAN Jun;ZHOU Jun;ZHAO bin;ZHANG WenYing(Excellent talent division of Ma′anshan Iron&Steel Co.,Ltd,Ma′anshan 243000,Anhui,China)
出处
《四川冶金》
CAS
2023年第1期47-51,共5页
Sichuan Metallurgy
关键词
铁矿石
废钢
冷却效应
熔池温度
密度
iron ore
steel scrap
cooling effect
bath temperaturel
density
