鲕状赤铁矿原料粒度对深度还原效果及铁颗粒形貌的影响  

Influence of ore granularity of oolitic hematite on coal-based reduction indexes and morphology of iron particles

作　　者：栗艳锋 韩跃新[1] 孙永升[1] 李艳军[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《中国矿业大学学报》2017年第3期622-627,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51134002)

摘　　要：采用化学分析、扫描电子显微镜(SEM)和工艺矿物学参数自动测试系统(BPMA),考察了鲕状赤铁矿原料粒度对深度还原效果及铁颗粒粒度分布、微观形貌等特征的影响.结果表明:降低原料粒度有利于金属化率和选别指标的提高,且提高的速率随原料粒度的减小逐渐增大;原料粒度越小,还原产物中铁颗粒粒度越大;在铁颗粒粒度频率分布方面,小粒径铁颗粒占主体,并随着粒径的增大,铁颗粒的粒度频率快速降低;还原产物中铁颗粒的形状主要以类球状、块状、棒状和链状分布,并随着原料粒度的增大,还原产物中铁颗粒的形貌愈加复杂.降低原料粒度有利于鲕状赤铁矿深度还原效果的提高和铁颗粒的生长.The metallization ratio,beneficiation index,cumulative frequency distribution and microtopography of iron particles in coal-based reduction process were investigated in details by chemical analysis,scanning electron microscope（SEM）and bgrimm process mineralogy analyzer（BPMA）.The results show that reducing granularity of raw ore is beneficial to the improvement of the metallization ratio and beneficiation index,and the increase rate increases with the decrease of raw ore granularity gradually.The smaller the raw ore granularity,the larger the iron particle in reduced product.In terms of the frequency distribution of iron particles,small particles of metallic iron account for the majority.And the granularity frequency of the iron particles declines quickly with the increase of particle size.The morphology of iron particles distributing in reduced product mainly presents as quasi-spherical,blocky,clavate and catenulate.Furthermore,with the increase of raw ore granularity,the morphology of iron particles in reduced product is increasingly complex.In conclusion,declining granularity of raw ore is beneficial to the improvement of the reduction effect and the growth of iron particles of oolitic hematite ore in coal-based reduction process.

关 键 词：鲕状赤铁矿 原料粒度 深度还原 铁颗粒形貌 

分 类 号：TD925.7[矿业工程—选矿]