Combustion Behavior of Coated Cokes with Fine Fe₃O₄ and CaO

Abstract

In order to improve particles of cokes in the sintered layer, we investigated the combustion behavior of coated cokes with fine Fe₃O₄ and CaO at 1173 K, 1273 K and 1473 K of experimental temperature. The reaction rates of the coated cokes were calculated by weight loss measurements using the thermo-balance electric combustion furnace. It was found that the reaction rates of the coated cokes with fine iron oxide (Fe₃O₄ or Fe₂O₃) and CaO were higher than rates of any other coated samples at almost conditions. Temperature dependence and generated CO₂ gas volume of samples during combustion were measured at 1173 K and 1273 K. The temperature of coated cokes with fine iron oxide (Fe₃O₄ or Fe₂O₃) and CaO were found to be rising over 1600 K in a few minutes at 1273 K of experimental temperature. Moreover, the generated CO₂ gas volume of samples were also drastically rising by the catalytic influence of CaO. The cross-sectional SEM images of coated cokes with fine iron oxide (Fe₃O₄ or Fe₂O₃) and CaO were observed. It was found that the coated layer was partially melted and surface area of coke was appeared.