K<sub>2</sub>O对烧结矿强度影响的试验研究

doi:10.13228/j.boyuan.issn0449-749x.20200059

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Abstract When there is a high content of alkali metals in ironmaking fuel, it will affect the quality of iron ore, lead to poor permeability and increase the coke ratio, these problems that steel companies matter. An alkali metal compound K₂O was focused on and analyzes its effects on the strength of hematite and calcium ferrite through batch preparation, strength test, and scanning electron microscope. The results show that the K₂O content increases from 0 to 4%, the compressive strength of hematite after sintering decreases from 5 000 to 2 863N; the compressive strength of calcium ferrite decreases from 3 066 to 680 N; On these bases, the effects of alkali metals on the strength of sintered ore were investigated through sintering pot experiments by adding dust to the sintering ingredients. The results of the sintering pot experiment show that the tumble strength of the sinter decreases with the increase of the proportion of dedusting ash. The proportion of dust increased from 0 to 3.23%, the alkali metal w(K₂O + Na₂O) of the sintered ore increased from 0.15% to 0.25% and the tumble strength of the sintered ore decreased from 81.07% to 75.47%. The research results can provide theoretical guidance and reference for improving the strength of sinter ore and reasonably controlling the alkali load of the blast furnace.

Key words： sinter K₂O hematite calcium ferrite strength

Received: 21 February 2020

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	Articles by authors
	ZHANG Xin
	JIANG Xin
	WANG Xue-bin
	LI Tao
	DING Guan-gen
	SHEN Feng-man

Cite this article:

ZHANG Xin,JIANG Xin,WANG Xue-bin等. Experimental study on influence of K₂O on strength of sinter[J]. Iron and Steel, 2020, 55(8): 49-55.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200059 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I8/49

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