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

作　　者：Haoyan Sun Zheng Zou Meiju Zhang Dong Yan 

机构地区：[1]Innovation Academy for Green Manufacture,Chinese Academy of Sciences,Beijing 100190,China [2]Institute of Process Engineering,Chinese Academy of Sciences,State Key Laboratory of Multiphase Complex Systems,Beijing 100190,China [3]University of Chinese Academy of Sciences,School of Chemical Engineering,Beijing 100049,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第6期1057-1066,共10页矿物冶金与材料学报（英文版）

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).

摘　　要：Magnetization roasting is one of the most effective way of utilizing low-grade refractory iron ore.However,the reduction roasting of siderite(FeCO3)generates weakly magnetic wüstite,thus reducing iron recovery via weak magnetic separation.We systematically studied and proposed the fluidized preoxidation-low-temperature reduction magnetization roasting process for siderite.We 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 temperature.The optimal fluidized magnetization roasting parameters included preoxidation at 610℃for 2.5 min,followed by reduction at 450℃for 5 min.For 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.

关 键 词：magnetization roasting fluidization SIDERITE preoxdization low-temperature reduction 

分 类 号：TF046.2[冶金工程—冶金物理化学]