中文摘要：

针对某高硅低品位铁矿中微细粒嵌布的赤铁矿,采用内配煤制粒的方法进行了还原焙烧-磁选研究。结果表明内配煤提高了微细粒赤铁矿还原过程中的还原气氛,实现了铁氧化物的快速还原。当制粒小球中m（C）：m（Fe）比为0.4,还原温度为950℃、还原时间为30 min时得到还原焙烧产物,磨矿磁选后得到铁品位为68.42%,回收率为81.13%的铁精矿。对还原焙烧产物进行的XRD和显微结构分析表明,随着内配煤用量的提高,金属铁明显增多且局部金属铁晶粒具有迁移长大的趋势,减少了铁橄榄石的形成,铁精矿品位和回收率明显提高。

英文摘要：

Reducing roasting and milling-magnetic separation was adopted to research on microgranular disseminated hematite within some low-grade iron ores that contain high-silicon. The research results show that the adoption coal promotes the reducing atmosphere within pellets, and shorten iron oxide＇s reducing process. When the ratio of fixed carbon and iron, m（e） ： m（Fe） , is 0. 4, reducing roasting environment is 950 ℃ and 30 min, reduced pellets were obtained. After grinding-magnetic separation, concentrates with 68. 42% iron grade and 81. 13% recovery rate were collected. The results of XRD and Microstructure analyzes of reduced roasting products show that increase coal dosage in the pellets can strongly improve metallization, partly promote the growth of iron metal, decrease the amount of fayalite formation and highly increase the recovery and concentrate grade of iron.