Mineralization characteristics of pellets prepared by ultrafine magnetite concentrate:influence on metallurgical property and improving method
作者机构：School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083HunanChina Northern Engineering and Technology CorporationMCCDalian 116600LiaoningChina
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2023年第30卷第3期
页 面：446-455页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：Ultrafine magnetite concentrate Mineralization characteristics Reduction degree Improving method Function mechanism
摘 要：The reducing property of pellets prepared by ultrafine magnetite concentrate(UMC)and improving method were *** results show that the reduction degree of UMC pellets is only about 56%compared with that of pellets prepared from ordinary iron ore concentrate with relatively coarse particle size,which is significantly lower than the general reduction degree of about 70%.When the composite binder composed of bentonite and organic binder was added,the reduction degree was significantly increased to 69.66%.The revealed mechanism shows that the reduced pellets with common bentonite have a concentric structure,the oxidation gap between the inner and outer layers is obvious,and the outer dense oxide layer hinders the oxidation and reduction of the inner *** adding the composite binder,the organic components significantly improved the internal porosity of the pellets and the aggregation degree of ultrafine iron ore concentrate particles in the granulation process,forming a porous *** non-uniform double-layer structure is eliminated,and the increased pores are conducive to the internal diffusion of CO,and finally the reduction degree of pellets is increased to the level equivalent to that of ordinary magnetite pellets.
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