Microstructure characteristics of dead stock coke from blast furnace

In order to reveal the relationship between the macroscopic properties and microstructure of dead stock coke, the differences between dead stock coke samples and feed coke samples were compared by industrial analysis, pore structure analysis, BET detection, XRD detection and SEM observation, etc. Dead stock coke samples and feed coke samples were both sampling from the stop experiment of a schreyerite BF in one factory in Xichang. Experimental results show that comparing with feed coke samples, the dead stock coke has significant differences in microcrystalline structure, stomatal structure, mineral distribution. The content of ash in dead stock coke increases, the number of super- atmospheric pores (pore size greater than 1000??m2) increases, the number of micropores (pore size of 0-50nm) and mesopores (pore size of 50-300nm) increase, and the crystallite size increases by about 4 times. In addition, the outer pores of the dead stock coke also adsorb a large amount of slag iron minerals, and the minerals are mainly magnesite, perovskite and iron carbon compounds. Then after the coke drops to the dead column area and stays for a long time, its porosity increases and the degree of graphitization increases.