球团矿还原膨胀率影响因素分析

doi:10.13228/j.boyuan.issn1006-9356.20230289

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Abstract Pellets are prone to expand abnormally during reduction, which is an important factor restricting their extensive use in blast furnace. Therefore, the effects of different SiO₂ content, alkali metal content and calcination temperature on the reduction swelling index were studied to look for the best component content and thermal system when the reduction swelling index of pellets was low. The results show that the reduction swelling index of pellets decreases with the increase of SiO₂ content. When SiO₂ mass fraction is 5.0%, the reduction swelling index is only 11.39%, and when SiO₂ mass fraction is reduced to 1.8%, the reduction swelling index increases to 60.67%. Alkali metal is an adverse factor to the reduction swelling index. When the mass fraction of alkali metal reaches 1.680%, the reduction swelling index of pellets increases significantly to 61.08%. When the mass fraction of alkali metal is only 0.045%, the reduction swelling index of pellets is 13.62%. The reduction swelling index decreases first and then increases with the increase of calcination temperature. When the calcination temperature is 1 260 ℃, the reduction swelling index reaches to the lowest 11.35%. The research results have certain significance for reducing the reduction swelling index of pellets and maintaining the stability and permeability of furnace burden in blast furnace.

Key words： pellet reduction swelling index SiO₂ alkali metal calcination temperature micro-morphology

Received: 09 May 2023

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	Articles by authors
	ZHAO Luyao
	TIAN Yunqing
	ZHAO Manxiang
	LIU Changjiang
	YU Xiaobo
	HAN Yingguang

Cite this article:

ZHAO Luyao,TIAN Yunqing,ZHAO Manxiang等. Analysis on influencing factors of reduction swelling index of pellets[J]. China Metallurgy, 2023, 33(10): 60-64.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230289 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I10/60

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