含锰磁铁矿球团氧化固结机理分析

doi:10.13228/j.boyuan.issn1006-9356.20220032

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Abstract In order to promote the application of manganese-containing magnetite in pellets, the effect of Mn₃O₄ on the oxidative consolidation mechanism of pellets was systematically analyzed by means of pelletizing tests and detection methods such as X-ray diffraction and scanning electron microscopy. The results show that when the mass fraction of Mn₃O₄ increases from 0% to 7%, the compressive strength of the pellets decreases from 2 458 N/piece to 1 810 N/piece, and the porosity increases from 22.7% to 26.2%. With the increase of Mn₃O₄, a new MnFe₂O₄ solid solution is formed in the hematite grain boundary and silicate phase. The solid solution expands the cracks in matrix and destroys the continuous crystallization of hematite. The increase of silicate content greatly inhibits the growth of hematite grains, which makes the matrix of manganese-containing pellets change from dense to porous, and its strength of pellets decrease. Therefore, for production enterprises, Mn₃O₄ has a negative impact on the consolidation and strengthening of pellets, and its appropriate mass fraction should be within 3%.

Key words： pellets magnetite Mn₃O₄ compressive strength consolidation mechanism

Received: 12 January 2022

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	Articles by authors
	FU Xu-gang
	MA Ke
	JU Jian-tao
	XING Xiang-dong

Cite this article:

FU Xu-gang,MA Ke,JU Jian-tao等. Analysis on oxidative consolidation mechanism of manganese-containing magnetite pellets[J]. China Metallurgy, 2022, 32(7): 80-86.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20220032 OR http://www.zgyj.ac.cn/EN/Y2022/V32/I7/80

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