Fluidized magnetization roasting of refractory siderite-containing iron ore via preoxidation-low-temperature reduction

作     者：Haoyan Sun Zheng Zou Meiju Zhang Dong Yan Haoyan Sun;Zheng Zou;Meiju Zhang;Dong Yan

作者机构：Innovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Institute of Process EngineeringChinese Academy of SciencesState Key Laboratory of Multiphase Complex SystemsBeijing 100190China University of Chinese Academy of SciencesSchool of Chemical EngineeringBeijing 100049China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2023年第30卷第6期

页      面：1057-1066页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学] 

基　　金：the National Natural Science Foundation of China(Nos.51974287 and 21736010) Innovation Academy for Green Manufacture,Chinese Academy of Sciences(No.IAGM-2019-A11) 

主　　题：magnetization roasting fluidization siderite preoxdization low-temperature reduction 

摘      要：Magnetization roasting is one of the most effective way of utilizing low-grade refractory iron ***,the reduction roasting of siderite(FeCO3)generates weakly magnetic wüstite,thus reducing iron recovery via weak magnetic *** systematically studied and proposed the fluidized preoxidation-low-temperature reduction magnetization roasting process for *** found that the maghemite generated during the air oxidation roasting of siderite would be further reduced into wüstite at 500 and 550℃due to the unstable intermediate product magnetite(Fe_(3)O_(4)).Stable magnetite can be obtained through maghemite reduction only at low *** optimal fluidized magnetization roasting parameters included preoxidation at 610℃for 2.5 min,followed by reduction at 450℃for 5 *** roasted ore,weak magnetic separation yielded an iron ore concentrate grade of 62.0wt%and an iron recovery rate of 88.36%.Compared with that of conventional direct reduction magnetization roasting,the iron recovery rate of weak magnetic separation had greatly improved by 34.33%.The proposed fluidized preoxidation-low-temperature reduction magnetization roasting process can realize the efficient magnetization roasting utilization of low-grade refractory siderite-containing iron ore without wüstite generation and is unlimited by the proportion of siderite and hematite in iron ore.