摘要
针对贵州某贫细鲕状赤铁矿难选的特点,开发了直接还原焙烧-磁选新工艺。采用箱式电阻炉加热,煤基直接还原工艺,经磨矿-磁选,得到高品位的铁精粉,为开发利用细粒嵌布复杂低品位铁矿提供了理论依据。通过L9(34)正交试验,确定试验的最佳条件为还原剂用量40%、助还原剂用量15%、焙烧温度1 050℃、焙烧时间180 min、磨矿浓度50%、磨矿产品粒度在-0.037 mm粒级含量达90%以上,磁选场强为112 kA/m。在最佳条件下可得到TFe品位为90.80%、回收率为89.58%、且有害杂质含量少的铁精粉。该工艺所得高品位铁精粉可代替废钢直接作为电炉炼钢的原料。
To beneficiate a refractory poor microfine oolitic hematite ore from Guizhou, a new technique of direct reduction-magnetic separation was developed. A coal-based direct reduction process was introduced to treat the raw ore heated using chamber electric furnace, then, after grinding and magnetic separation, iron powder with high grade can be synthesized. This work provides a theoretical foundation for exploitation and utilization of finely-disseminated complex lowgrade iron ore. According to the L9 （34） orthogonal test, optimum conditions can be determined as： reducing agent of 40% , accessory reducing agent of 15% , calcination temperature of 1 050℃, calcination time of 180 min, grinding concentration of 50% , grinding grain of over 90% - 0. 037 ram, and field strength for magnetic separation of 112 kA/m. Under these conditions, iron powder with a TFe grade of 90.80% and recovery of 89.58% , and with less harmful impurities, can be produced, and it can be directly used as a feed for electric furnace in place of steel scrap.
出处
《矿冶工程》
CAS
CSCD
北大核心
2011年第5期43-45,49,共4页
Mining and Metallurgical Engineering
关键词
贫细鲕状赤铁矿
直接还原
磁选
microfine low-grade oolitic hematite ore
direct reduction
magnetic separation
