微波焙烧赤泥-稻壳压块回收铁  

Recovery of iron from red mud-rice husk briquettes by microwave roasting

作　　者：曾一钧 曾奎 全学军[1] 姜启彬 闫春宇 蒋孟芝 ZENG Yijun;ZENG Kui;QUAN Xuejun;JIANG Qibin;YAN Chunyu;JIANG Mengzhi(School of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学化学化工学院,重庆400054

出　　处：《中国有色金属学报》2024年第5期1702-1711,共10页The Chinese Journal of Nonferrous Metals

基　　金：重庆英才计划资助项目(CQYC20210309538)。

摘　　要：本文提出了一种利用微波体相加热还原焙烧赤泥−稻壳压块并从中回收铁的新方法,研究了进料方式、生物质用量、焙烧温度和时间等主要工艺参数对铁回收的影响。结果表明:在稻壳赤泥比为3、焙烧温度为1000℃、焙烧时间为20 min的优化条件下,得到铁品位为60.1%、回收率为86.3%的铁精矿。利用X射线衍射和X射线荧光光谱分析研究了赤泥中铁氧化物还原过程的机理,赤泥中的含铁矿物被还原成Fe和FeO等磁性物质。An innovative method to recover iron from reduction-roasted red mud-rice husk briquettes using microwave bulk-phase heating was proposed.The effects of the main process,parameters,such as feeding mode,biomass dosage,roasting temperature and time on iron recovery were investigated.The results show that,under the optimized conditions of rice husk to red mud mass ratio of 3,roasting temperature of 1000℃and roasting time of 20 min,the iron concentrate with iron grade of 60.1%and recovery rate of 86.3%is obtained.The mechanism of the reduction process of iron oxides in red mud was analyzed and investigated using X-ray diffraction and X-ray fluorescence spectroscopy.The iron-containing minerals in red mud are reduced to magnetic substances,such as Fe and FeO.

关 键 词：微波体相加热 还原焙烧 赤泥−稻壳 压块 铁回收 

分 类 号：X78[环境科学与工程—环境工程] TQ110[化学工程—无机化工]