Reaction Behavior of Coke in a High Alumina Slag

Abstract

The reaction behaviors between coke and CaO–SiO₂–MgO–Al₂O₃–Cr₂O₃ slag at different immersion time, temperature and rotation speeds were studied in this work. The diameter decrement of the coke increased as increasing the immersion time, temperature and rotation speed. When the coke was in contact with the molten slag, the slag could infiltrate into the coke and further flow to the interior of the coke through pore channels, which will fill up the coke pores. During the penetration process of slag into the coke, the carbon could be oxidized by Cr₂O₃ and SiO₂ in the slag. Furthermore, the penetrated slag could also dissolve the coke ash minerals and react with that to form new phase. The comprehensive effects of slag penetration, slag-carbon reaction and slag-mineral reaction eventually resulted in the coke degradation.