Relationship between CO2 Reactivity and Structure of Metallurgical Cokes (II):Influence of Pore Structure on CO2 Reactivity of Metallurgical Cokes

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The optical texture, pore structure and ash constituents of cokes must be generally influencial factors for CO2 gasification reaction of cokes. In the present report, the influence of pore structure of the three factors on maximum gasification rate (RM) of lump cokes at 1100°C were studied with seven cokes produced from single coking coals of various ranks. The results were as follows. (1) RM showed minimum at Ro=ca. 1.5% (mean maximum reflectance). (2) Smoky River and Itmann cokes with high contents of flow type texture, the parent coals of which were 1.57% and 1.66% in Ro respectively, had larger internal surface area mostly due to micro pore (radius: 110Å>) than the others. (3) Both cokes were larger in the average radius of macro pore (radius: 110-42000Å) than the others. (4) Pore-diffusion resistance, which was evaluated by "effective reaction coefficient" defined as the ratio of RM to reaction rate without the influence of pore-diffusion, tended to decrease with increasing the average radius of macro pore. It was concluded that the cokes from high rank coals have the weak pore-diffusion resistance due to macro pore with large pore radius and the large internal surface area due to well-developod micro pore, and therefore CO2 reactivity of the cokes must be high in spite of high contents of flow type texture.
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