Solution loss characteristics of cokes in coke-sinter coupling reaction
SUN Yang1, DOU Ming-hui1, WANG Jia-jun1, GUO Rui1,2, SUN Zhang1,2, LIANG Ying-hua1
1. College of Chemical Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Coal Chemical Engineering Research Center of Hebei Province, Tangshan 063210, Hebei, China
Abstract：In order to investigate the solution loss behavior of cokes in blast furnace, two kinds of cokes with different reactivities were selected, and the coupling reactions of cokes and sinter at different temperatures were studied to clarify the relationship between the solution loss of cokes and the reduction of sinter. The results showed that the coupling reaction between cokes solution loss reaction and reduction reaction of sinter was accelerated gradually with the increase of temperature, and a higher reactivity of coke was beneficial to the reduction of sinter. There was a positive linear correlation between solution loss ratio of coke and reduction degree of sinter. Also, the coke reactivity index (CRI) was inversely proportional to k and directly proportional to b, and the intercept b can be used to characterize the initial reducibility of coke to sinter. The coke-sinter coupling reaction greatly increased the OTI, average pore size and porosity of cokes. The solution loss reaction of the coke with higher reactivity was easy to take place on the surface of cokes, and the pore size of cokes after reaction was larger. For the coke with lower reactivity, CO2 gas was easy to diffuse into the inside of cokes, and all levels of pores were uniformly eroded by CO2.
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2021, Vol. 31 
