The incorporation of high-magnesium boron-bearing magnetite concentrate in pellet production facilitates the efficient separation of boron and iron within the concentrate.However,the limited research has been conducted on the influence of the ratio of high-magnesium boron-bearing magnetite concentrate on the pellet consolidation mechanism and reduction characteristics.The effects and mechanisms of varying the ratio of high-magnesium boron-bearing magnetite concentrate on the strength and reducibility of the pellets were investigated.Additionally,it explores the potential for enhancing reduction characteristics by lowering the firing temperature during pellet preparation based on the consolidation mechanism of the pellets.The results indicate that the increase in the proportion of high magnesium boron magnetite concentrate in ordinary magnetite concentrates helps to increase the content of spinel type magnesium ferrite phase inside the pellets,improve the grain morphology of hematite,promote the formation of"hematite spinel type magnesium ferrite"structure,and thus improve the strength of the pellets.However,during the preparation of pellets with the addition of high-magnesium boron-bearing magnetite concentrate,the spinel-type magnesium ferrite generated during the firing process can have a significant negative impact on the reducibility of the pellets.Therefore,to ensure both the strength of the pellets and a certain level of reducibility,the firing temperature of pellets containing high-magnesium boron-bearing magnetite concentrate should not exceed 1 150 ℃.
关键词
高镁含硼磁铁精矿/球团矿/固结机制/抗压强度/还原特性/还原度
Key words
high-magnesium boron-bearing magnetite concentrate/pellet/consolidation mechanism/cold crushing strength/reduction characteristics/reducibility index
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