Sustainable iron recovery from iron ore tailings using hydrogen-based reduction roasting and magnetic separation: A pilot-scale study  

作　　者：Xinran Zhu Xuesong Sun Yanjun Li Yuexin Han 

机构地区：[1]School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China [2]National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第3期81-90,共10页中国化学工程学报(英文版)

基　　金：National Natural Science Foundation of China(52104249);Liaoning Joint Fund General Support Program Project(2023-MSBA-126);the Fundamental Research Funds for the Central Universities(N2401019).

摘　　要：Iron tailings are a common solid waste resource,posing serious environmental and spatial challenges.This study proposed a novel hydrogen-based reduction roasting(HRR)technology for the processing of iron tailings using a combined beneficiation and metallurgy approach.Pilot-cale experiment results indicated that under the gas composition of CO:H_(2)=1:3,and optimal roasting conditions at a reduction temperature of 520℃,the majority of weakly magnetic hematite transforms into strongly magnetic magnetite during the reduction process.Combining roasting products with a magnetic separation egrindingemagnetic selection process yields a final iron concentrate with a grade of 56.68%iron and a recovery rate of 86.54%.Theoretical calculations suggested the annual production value can reach 29.7 million USD and a reduction of 20.79 tons of CO_(2) emissions per year.This highlights that the use of HRR in conjunction with traditional beneficiation processes can effectively achieve comprehensive utilization of iron tailings,thereby reducing environmental impact.

关 键 词：Iron ore tailings HYDROGEN Reduction roasting Magnetic separation CO_(2)emissions 

分 类 号：TD951[矿业工程—选矿]