Evolution of Micropore Structure of Cokes during Ore-coke Coupling Reaction
To study the solution-loss behavior of cokes in blast furnace,a test is carried out on the ore and coke coupling re-action at different times by sampling the metallurgical cokes,sinters and pellets to analyze the pore structure of reacted coke through microscopic imaging,and figure out the pore evolution law.The result suggests that:(1)the small pores of coke are fused to medium-sized and large-sized pores along with the progress of the ore and coke coupling reaction,and the solution-loss depth of coke increases;the pore expansion occurred during the sinter and coke coupling reaction is smaller than that occurred during pellet and coke coupling reaction;(2)the corrosion of the pore structure is more severe than that in the pel-let and coke coupling reaction,same is the pore fusion,and the evolution rate of the coke pore structure is faster;(3)in the coke and sinter coupling reaction,the deep reaction layer is thicker and the nucleus reduction is lower;however,when the coke reacts with the pellets,the pore wall corrosion is intensified,the deep reaction layer is thinner and the nucleus reduc-tion is higher.
cokesolution-loss reactionore and coke couplingmicroscopic imaging methodfusion of small pores
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