不同类型铁矿石的低温还原粉化特征  

Low Temperature Reduction Degradation Characteristics of Different Types of Iron Ores

作　　者：高雅巍[1,2] 李京社[1] 刘成松[1] 唐海燕[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《中国冶金》2013年第10期1-5,共5页China Metallurgy

摘　　要：以炼铁厂常用烧结矿、球团矿以及块矿为研究对象,考察了不同含铁原料在高炉炼铁工艺和COREX非高炉炼铁工艺2种煤气条件下的低温还原粉化行为。研究结果表明:①铁矿石的结构组成决定了其粉化形式,块矿和烧结矿的粉化形式均表现为"裂开式",粉化产生的细小粒级颗粒较均匀地分布于-6.3mm范围;不同于烧结矿和块矿,球团矿则属于"剥落式"粉化,粉化产物粒径主要集中在-0.5mm范围;②在还原气氛和温度相同的情况下,烧结矿粉化程度最高,球团矿次之,块矿最低;③还原温度对3种含铁炉料的还原粉化程度均具有重要影响,当还原煤气条件相同时,3种含铁炉料的低温还原粉化指数均在550℃时达到最大值;④COREX炼铁工艺的煤气条件加剧试验用铁矿石的低温还原粉化程度,但对不同类型铁矿石的影响有所差异,综合粉化产生的细小颗粒的增幅可知,块矿受其影响程度较大,其次是球团矿,而烧结矿对煤气性质改变的敏感性最小。The typical sinter, pellets and lump ore were studied in this work, and the low temperature reduction deg-radation characteristics of different types of iron ores were tested and compared under the reducing gas conditions of two iron making processes. The results show that：① the degradation forms depend on the structure of iron ores. The lump ore and sinter both present the degradation of“cracking”, and the distribution of small grains generated from the cracking is in the range of 0.5 mm and 6.3 mm uniformly. Compared with lump ore and sinter, the pellets present the degradation of“surface stripping” and the RDI -0.5 of the pellets is the highest;②in the same condition of gas and temperature, for the degradation degree（RDI -3.15 ）, the sinter is the highest, the pellets are relatively lower and the lump ore is the lowest;③the temperature plays a important role in the low temperature reduction deg- radation of iron ores whose reduction degradation indexes（RDI） reach the peak at 550℃;④the low temperature reduction degradation degrees of iron ores are extended with adopting the hydrogen-enriched gas with high reduction potential, while the influence extent is discrepant for the different iron ore. Colligating the increase amplitude of grains in three small size fractions, the influence of the reducing gas on the lump ore is the biggest, and next come pellets, and the sensitivity of the sinter on the reducing gas properties change is relatively small.

关 键 词：低温还原粉化 块矿 球团矿 烧结矿 

分 类 号：TF521[冶金工程—钢铁冶金]