采用XRD和SEM研究了4种还原剂对高磷鲕状赤铁矿中铁、含磷脉石矿物的还原焙烧行为的影响.结果表明,还原剂用量＜20％时,固定碳含量较高的还原剂有利于铁的还原,焙烧产物中有大量单个球形铁颗粒的形成,但不利于降磷;还原剂用量＞20％时,挥发份含量较高的还原剂有利于焙烧产物中铁颗粒的聚集、连接和长大,对降磷有利.还原剂用量充足时,铁颗粒的聚集和长大改善了金属铁和含磷脉石矿物的解离条件,使用不同还原剂时其改善的程度不同.在还原剂用量为40％时,焦炭和无烟煤所得焙烧产物中铁颗粒与含磷脉石矿物嵌布粒度较细,在磨矿过程中难以实现单体解离;褐煤所得焙烧产物中铁颗粒聚集和长大的趋势更显著,且与脉石矿物界限分明,有利于单体解离.
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