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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。
Aiming at the hematite embedded in fine-grained silicon ore with low-grade iron ore, reduction roasting-magnetic separation was carried out by using the method of blending coal and granulating. The results show that the internal blending of coal improves the reducing atmosphere during the reduction of fine hematite and realizes the rapid reduction of iron oxide. When the molar ratio of m (C): m (Fe) in the pellets is 0.4, the reduction temperature is 950 ℃ and the reduction time is 30 min, the roasted products are obtained. The grade of iron obtained by grinding and magnetic separation is 68.42% 81.13% of the iron concentrate. XRD and microstructure analysis of the reduced roasted products showed that with the increase of internal coal blending, the amount of metallic iron increased obviously and the local metallic iron particles had the tendency to migrate and grow, which reduced the fayalite formation. Mineral grade and recovery significantly improved.