通过模拟高炉内焦炭同时受钾和钠蒸汽影响的实际情况,得到在钾和钠不同比例条件下焦炭结构和热性能(CRI、CSR)的变化.结果表明,碱金属的比例达到3％时,就会破坏焦炭结构,而且随着钾蒸汽比例的提高,焦炭粉末也会增多,这表明钾蒸汽对焦炭结构造成了巨大破坏.当钾和钠的质量比为3:7时,焦炭的反应性(CRI)达到最高,反应后强度(CSR)达到最低.通过扫描电镜和能量光谱仪观察发现,焦炭基体和矿物质中均存在钾和钠;通过X射线衍射检测发现,焦炭和碱金属蒸汽发生反应生成了霞石,霞石中钾和钠的含量取决于碱金属蒸汽中两者的比例.
Through simulating the actual situation where coke was simultaneously affected by K and Na vapours in blast furnace,the evolution of coke structure and thermal properties(CRI,CSR)after alkalization with different proportions of K and Na vapours were revealed.Results showed that the coke structure was broken when the proportion of alkali vapours reached 3％,and the coke fine formation rate increased with the increase of K vapour,which indicated that K vapour caused a great damage to coke structure.The CRI of coke reached the highest and the CSR reached the lowest when mass ratio of K/Na was 3/7.It was observed with SEM and energy dispersive spectrometer that K and Na existed in both mineral matters and carbon matrix;nepheline,generated when coke reacted with alkaline (K,Na) vapours,was determined by XRD.The content of K and Na in nepheline is dependent on the ratio of alkaline (K,Na).
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