泉州闽光高炉铁水粘度影响因素的分析

Analysis of influencing factors on hot metal viscosity of blast furnace in Minguang Company of Quanzhou

福建泉州闽光钢铁有限责任公司三座高炉自2012年起,出铁沟开始出现严重的铁水粘沟现象。本次研究通过有针对性现场取样,利用化学成分分析的方法,探究问题的主要原因。研究结果表明,铁水粘沟现象主要受温度、石墨碳及铁水成分的影响。炉缸铁口个数以及铁水成分差异导致了三座高炉之间的铁水粘沟情况不同。而铁水温降及石墨碳析出因素则是导致出铁沟不同位置粘沟存在差异的原因。本文结合热力学理论以及闽光钢铁厂实际冶炼情况,提出了控制铁水成分的有效措施。其中采用源头控制方法,可以实现对于铁水中[P]含量的单独调控。而铁水中的[Mn]、[Si]、[S]和[Ti]含量则可通过调控造渣及炉缸操作制度来实现。

Since 2012,the three blast furnaces have been found to exist the phenomenon of hot metal retaining in tapping channel in Fujian Quanzhou Minguang iron and steel Co.Ltd.Through targeted on-site sampling and chemical composition analysis,this study explored the main reasons for the problem.The results show that the viscosity of molten iron is mainly affected by temperature,graphite carbon and composition of molten iron.The difference number of tap holes and the composition of molten iron lead to the difference in the degree of the hot metal viscosity problem between three blast furnaces.However,the factors of temperature drop and graphite carbon precipitation are the reasons for the difference of hot metal viscosity problem at different positions.This paper combined with the theory of thermodynamics and the actual smelting situation of Minguang steel works,the effective measures to control the composition of molten iron are put forward.The source control method can realize the separate control of[P]content in molten iron,and the control on content of[Mn],[Si],[S]and[Ti]in molten iron can be achieved by regulating the slag-making and hearth operation system.