摘要
高炉生产中所用的金属化球团普遍采用转底炉工艺生产,但某钢铁企业金属化球团由于残锌量高,难以在高炉中使用,为此考虑将其作为含铁冷料在转炉中使用。为获得可行的工艺参数,开展了金属化球团熔融处理试验,深入研究了Zn的挥发行为。结果表明,钢液中的碳和锌含量呈反比关系;在初始碳含量为0.1%时,渣中Fe^(3+)/Fe^(2+)值与ZnO含量呈线性关系。Fe^(3+)/Fe^(2+)值大于1.0时,其值与Zn在钢液和炉渣中的分配比呈明显的正相关关系,与在气相的分配比呈负相关关系;当Fe^(3+)/Fe^(2+)值小于1.0时,Zn在钢液、炉渣和气相中的分配比保持稳定。在加入金属化球团之前,钢液中的碳含量与终点锌含量显著相关。随着碳含量的降低,终点锌含量呈先上升后下降的变化规律。在临界碳含量0.3%的条件下,加入金属化球团可使锌最大量地稳定地掺入钢液,此时锌蒸发并逃逸进入废气管道的总量最小化,从而减少了潜在的堵塞风险。
Metallized pellets used in blast furnace production are generally produced by the rotary hearth furnace process.However,due to the high residual zinc content of metallized pellets in a certain steel enterprise,they are difficult to be used in blast furnaces.Therefore,it is considered to use them as iron-containing coolant in converters.To obtain feasible process parameters,experiments on the melting treatment of metallized pellets were carried out,and the volatilization behavior of Zn was deeply studied.The results show that the contents of carbon and zinc in molten steel are inversely proportional.When the initial carbon content is 0.1%,the Fe^(3+)/Fe^(2+)value in the slag has a linear relationship with the ZnO content.When the Fe^(3+)/Fe^(2+)value is greater than 1.0,its value shows a significant positive correlation with the distribution of Zn in molten steel and slag,and a negative correlation with the distribution ratio in the gas phase.When the Fe^(3+)/Fe^(2+)value is less than 1.0,the distribution ratio of Zn in the molten steel,slag and gas phase remains stable.Before the addition of metallized pellets,the carbon content in the molten steel was significantly correlated with the zinc content at the endpoint.With the decrease of carbon content,the zinc content at the end point shows a changing pattern of first increasing and then decreasing.Under the condition of a critical carbon content of 0.3%,the addition of metallized pellets can enable zinc to be stably incorporated into the molten steel in the maximum amount.At this time,the total amount of zinc evaporation and escape into the exhaust gas pipeline is minimized,thereby reducing the potential risk of blockage.
作者
阮帅
张延玲
王冠博
余阚
Ruan Shuai;Zhang Yanling;Wang Guanbo;Yu Kan(National Key Laboratory of Green Low-Carbon Steel Iron Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Guangdong Shaoguan Iron and Steel Group Co.,Ltd.,Shaoguan 512123,Guangdong)
出处
《河北冶金》
2025年第5期20-25,75,共7页
Hebei Metallurgy
关键词
锌
转底炉
分配比
金属化球团
ZNO
碳含量
挥发行为
zinc
rotary hearth furnace
distribution ratio
metallized pellets
ZnO
carbon content
volatilization behavior
