7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

In this paper, the investigation on erosion of hearth sidewall lining of 3BF(campaign life of 19 years) and 4BF(campaign life of 9 years) at Baosteel and analysis of erosion reasons have be done. The paper expatiated the production techniques and maintaining measures to control rising hearth sidewall temperature and erosion of large size blast furnaces at Baosteel, such as improving permeability of deadman and decreasing circuiting flow density of hot metal in hearth by increasing blast energy or center coke charging operation; controlling erosion at areas near taphole by intensifying the tapping management and prolong length of the tapholes, and so on. Based on the investigation results of carbon brick damage at 4BF, the paper have expounded the base and importance of ensuring construction quality and carbon slurry quality, ensuring higher heat transfer effect of stave-lining system for prolong lifetime of hearth. Based on the operation practice of Baosteel BFs, the viewpoint that maintaining a stable solidified iron layer (protecting layer) on hot surface of carbon brick are the key for prolong campaign life of hearth, has be discussed deeply, and the opinions, suggestions about the design and installation positioning of stave-carbon brick system have also be put forwards.