ABSTRACT

Coke–slag–metal samples located near the deadman edge and below the taphole of blast furnace were obtained by core drilling after cooling. The chemical composition, microstructure, phase composition and distribution of samples were studied in detail. In addition, the graphitisation degree of coke in hearth was also investigated. The results showed that coke larger than 60 mm still existed (more than 1%). Pores in coke are filled with molten slag and a small part of liquid iron. The pores in hearth coke are not completely filled, but there is still plenty of micropore, with a volume of less than 1 mm³. There are also a little alkali metals (K and Na) in ash, which causes the deterioration of coke. The iron–carbon interface is covered by a slag layer. The coke remained in deadman long enough to undergo the graphitisation process.

摘要

焦炭-渣-金属样品位于死人边缘附近和高炉出铁口下方，冷却后通过岩心钻孔获得。详细研究了样品的化学成分、微观结构、相组成和分布。此外，还考察了炉缸中焦炭的石墨化程度。结果表明，大于 60 mm 的焦炭仍然存在（超过 1%）。焦炭中的孔隙充满了熔渣和一小部分铁水。炉缸焦炭中的孔隙未完全填满，但仍有大量微孔，体积小于1 mm ³. 灰分中还含有少量碱金属（K、Na），使焦炭变质。铁-碳界面被渣层覆盖。焦炭在死炉中停留的时间足够长以进行石墨化过程。