アルカリ吸着によるコークスの劣化について

概要

論文の詳細を見る
A fundamental study on the degradation by alkali adsorption of two cokes made from ordinary (A) and specially inferior (B) coal blends, which had been used in the 26th run of the experimental blast furnace, was carried out. Following results were obtained : 1) The rate of alkali adsorption at the temperature ranging from 800 to 1000℃ in N_2 atmosphere depends on the initial porosity of coke. 2) Alkali is adsorbed by either coke and its rate near 1% of enough to generate macro-cracks. The degree of macro-crack formation increases with the increase of alkali adsorption, and it is higher in the less porous coke (A) than in the more porous one (B) under the same rate of alkali adsorption. 3) The presence of CO_2 in the atmosphere diminishes macro-cracks due to alkali adsorption, and the crack formation is completely prevented at some P_<CO_2> higher than 0.05∿0.06 atm. 4) Micro-strengths of every macro-cracked cokes and of coke fines generated by alkali adsorption decrease extremely. Alkali adsorption is considered to be a cause of degradation common to all kinds of coke, but it is difficult to regard it as the cause of remarkable degradation of coke (B) in the 26th run.
社団法人日本鉄鋼協会の論文
1979-04-01