赤泥磁化焙烧—磁选提铁试验研究  

Experimental research on red mud magnetization roasting-magnetic separation iron extraction process

作　　者：刘明霞 胡超杰 姬志杰 张汉泉[1] LIU Mingxia;HU Chaojie;JI Zhijie;ZHANG Hanquan(School of Resources&Safety Engineering,Wuhan Institute of Technology,Wuhan 430205,Hubei,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430205

出　　处：《烧结球团》2022年第2期74-80,共7页Sintering and Pelletizing

基　　金：国家自然科学基金面上项目(51974204);武汉工程大学科学基金资助项目(20QD66);武汉工程大学第十一届研究生教育创新基金资助项目(CX2020363)。

摘　　要：为了实现赤泥中铁资源的高效回收,本文以广西某地拜耳法赤泥为原料,比较“磁化焙烧—弱磁选”和“强磁抛尾—精矿焙烧—弱磁选”两种方案下焙烧温度、焙烧时间和CO体积分数对弱磁选提铁行为的影响。结果表明:经1440 kA/m强磁抛尾预处理后,在焙烧温度为650℃、焙烧时间为50 min、总气体流量为500 mL/min、CO体积分数为30%条件下,赤泥经“磁化焙烧—弱磁选”处理,可获得铁品位为60.35%,回收率为76.31%的铁精矿,其综合产率和回收率分别为48.93%和60.83%。强磁选预富集作用明显,磁化焙烧则进一步将赤泥中弱磁性的铁矿物还原成强磁性的磁铁矿,便于弱磁选回收铁。In order to realize the efficient recovery of iron resources in red mud,taking the Bayer red mud from Guangxi as the material,the effects of calcination temperature,roasting time and CO volume fraction on the behavior of weak magnetic separation and iron extraction under the two schemes of“magnetization roasting-weak magnetic separation”and“high-intensity magnetic separation discarding tailings-concentrate roasting-weak magnetic separation”are compared.The results show that after pretreatment with 1440 kA/m high-intensity magnetic separation discarding tailings,under the conditions of calcination temperature of 650℃,calcination time of 50 min,total gas flow of 500 mL/min and CO volume fraction of 30%,red mud is processed by“magnetization roasting-weak magnetic separation”,the iron concentrate with iron grade of 60.35% and recovery rate of 76.31% can be obtained and its combined yield and recovery are 48.93% and 60.83%,respectively.The strong magnetic separation pre-enrichment is obvious,and the magnetization roasting further reduces the weakly magnetic iron minerals in the red mud to strongly magnetic magnetite,which facilitates the recovery of iron by weak magnetic separation.

关 键 词：赤泥 强磁抛尾 磁化焙烧 弱磁选 

分 类 号：TF52[冶金工程—钢铁冶金] TF82