摘要
针对我国低品位难选铁矿储量大、利用率低的问题,采用深度还原焙烧-磁选法对低品位难选赤铁矿石进行了研究.试验结果表明,在以煤作还原剂,用量30%,JZQ-F1为助还原剂,用量为15%,焙烧温度为1 200℃,焙烧时间为90min的条件下,可以得到铁品位91.27%、铁回收率91.04%的铁精矿.利用X射线衍射(XRD)和扫描电镜(SEM)对还原过程中助还原剂JZQ-F1和JZQ-F2的作用机及理进行研究.发现JZQ-F1可以促进浮氏体还原为金属铁,并且可以抑制铁橄榄石的生成.JZQ-F2也可抑制铁橄榄石的生成,并且与原矿中石英发生反应,破坏原矿结构,使还性原气体更易和赤铁矿接触发生还原反应.
In view of the problem of large reserves of low-grade refractory ore along with low utilization, a study was conducted on refractory low-grade hematite by using deep reduction roasting-magnetic separation. The results show that under the conditions of using coal as the reducer with a dosage of 30%, JZQ-F1 as the assistant reducer with a dosage of 15%, and roasting at 1200℃ for 40min, the iron ore concentrate with the Fe content of 91.27% and Fe recovery of 91.04% was produced. The mechanisms of JZQ-F1 and JZQ-F2 are also investigated by X-ray Diffrac- tion （XRD） and Scanning Electron Microscope （SEM）. The results show that JZQ-F1 can promote the reduction of wustite to metallic iron and inhibit the formation of fayalite. JZQ-F2 can also inhibit the formation of fayalite and re- act with quartz, and thereby destroy the structure of raw mine, so that the reaction between reducing gas and hema- tite be easy.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2011年第12期1630-1636,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(5107406)
关键词
赤铁矿石
助还原剂
深度还原
焙烧
hematite ore
aidant reducer
deep reduction
roasting
