添加剂对焦炭冶金性能及微观结构的影响

Influence of additives on coke metallurgical properties and microstructures

为了掌握高反应性铁焦性能及微观结构,分别以高炉除尘灰和铁矿粉为添加剂在40 kg焦炉中生产高反应性铁焦。结果表明,配入添加剂后焦炭反应性明显升高,铁氧化物最终大部分被还原成单质铁,以球状颗粒形式存在于焦炭内部,在焦炭气化反应时起到催化作用。随着添加剂配比的增加,含铁物质在焦炭局部开始聚集,形成片状区域,使得铁元素催化作用极大降低。研究表明,铁颗粒与碳基质的有效接触是影响铁元素催化作用的重要因素。

In order to investigate the metallurgical properties and microstructures,the highly reactive ferro-cokes were produced by using additives including blast furnace dust and iron ores in a coke oven with the capacity of 40 kg. It could be found that the coke reactivity increased greatly with the additives. Iron oxide was mostly reduced to iron existing inside the coke in the form of spherical particles which was capable of catalyzing the gasification reaction of coke. With the increase of additive proportion,the material containing iron began to concentrate in some local areas of coke,and these areas became larger,thus resulting in the catalytic effect of Fe weakened greatly. It is proposed that the effective contact between iron particle and carbon is the main factor affecting the catalytic effect of Fe.