Economical and Efficient Protection for Blast Furnace Hearth

Abstract

In order to clarify the erosion mechanism of carbon brick and realize the economical and efficient protection for blast furnace hearth at the end of the service. The damaged carbon bricks were sampled from a commercial blast furnace, the microstructure of the damaged carbon bricks was analyzed through SEM and EDS. The carbon undersaturation degrees of molten iron for different volume blast furnace were calculated, the dissolution and the penetration were considered as the reasons for the erosion of carbon brick. A model of economical and efficient protection for hearth was established based on various factors, the economy of protection raw material and the protection effect can be evaluated through the model. The model guides the selection of the economical protection raw material according to the evaluation, the reasonable operation can be obtained according to the calculation of the fettling rate.