フライアッシュ人工骨材の発泡機構 -フライアッシュ人工骨材(第2報)-

概要

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To produce an artificial aggregate of stable quality, investigations of the expansion / sinter mechanism of coal fly ash are required. The purpose of this study is to clarify the influence of carbonecious substances on pellet expansion by firing, especially related to the atmospheric conditions. The study revealed two types of expansion. One relates to unburned coal fragments which exist separately from ash particles. In this case, large pores are formed around an oxidization front in the expanded pellet, accompanied by a macroscopic double - core structure in the sintered zone proceeding from outside. The other relates to very small coal fragment trapped in glassy spheres. Because the spheres in the pellet are distributed homogeneously, small pores are also inflated homogeneously with producing CO2 and CO. These gasses are generated by a reaction of the unburned coal fragments and oxygen in the glassy structure.
2000-01-25