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浙江大学学报(工学版)
J4  2011, Vol. 45 Issue (5): 885-889    DOI: 10.3785/j.issn.1008-973X.2011.05.018
    
Investigation on upgrading iron ore utilized by circulating
fluidized bed roasting and magnetic separation
WANG Guo-jun, ZHU Yan-qun, WANG Zhi-hua, YANG Li, WANG Xing-hao,
HUANG Zhen-yu, ZHOU Jun-hu, CEN Ke-fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Abstract  

The lowgrade iron ore has typically characterisic of disseminated fine granularity, complex components and difficult purification in China. Therefore, a new process of integrated circulating fluidized bed(CFB) roasting with magnetic separation was employed to upgrade the low-grade iron ore. Under the reducing atmosphere condition with 10% CO and N2 balanced, the Xinjiang's low-grade iron ore, which was below 1 mm diameter, 9.63% by grade orginally, was roasted at 850 ℃for 10 minutes, to obtain highly magnetic magnetite After grinding, 75% less than 0.074 mm in diameter, and wet type magnetic seperation at 71.66 kA/m, 46.25% iron ore grading was obtained with iron recovery around 25.52%. The results verifies that using the way of CFB roasting-magnetic separation process can improve the quality of the iron ore, reduce roasting time, improve the production cycle.

Published: 24 November 2011
CLC:  TK 22  
  TD 92  
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Cite this article:

WANG Guo-jun,ZHU Yan-qun,WANG Zhi-hua,YANG Li,WANG Xing-hao,HUANG Zhen-yu. Investigation on upgrading iron ore utilized by circulating
fluidized bed roasting and magnetic separation. J4, 2011, 45(5): 885-889.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2011.05.018     OR     https://www.zjujournals.com/eng/Y2011/V45/I5/885


低品位铁矿石流化焙烧-磁选提质试验研究

针对我国低品位铁矿石嵌布粒度极细,成分复杂,难提难选的现况,运用循环流化床和磁选管进行劣质铁矿石的流化焙烧磁选试验研究,试验采用CO、N2的混合气体营造还原性气氛（其中CO体积分数为10%）,将粒径为1 mm以下的新疆某低品位铁矿石（原矿铁品位为9.63%）于850 ℃焙烧10 min,得到强磁性的磁铁矿,将焙烧产物破碎细磨（磨至200 目以下占75%）,利用湿式磁选管在71.66 kA/m的磁场强度下进行弱磁选抛尾,可以得到铁精矿品位为46.25%,全铁回收率为25.52%的选矿指标.研究表明，运用循环流化床焙烧-弱磁选的方法提质铁矿石,可以有效地减少焙烧时间,在保证选矿达标的基础上,有效地降低生产周期.

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