配加预处理脱硫灰对铁矿烧结基础特性的影响

doi:10.13228/j.boyuan.issn0449-749x.20190142

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Abstract The most commonly used stacking disposal method of the sintering flue gas semi-dry desulfurization ash takes up land and is prone to secondary pollution. A technical idea of using the pre-treatment desulfurization ash to add into the sintering raw materials by replacement the CaO flux so as to make full use of the flux components was proposed,expecting to realize the closed-circuit resource utilization of the desulfurization ash in metallurgical enterprises. The thermal decomposition of desulfurized ash with carbon and the effect of the addition of pre-treatment desulfurization on the basic characteristics of the iron ore were studied. The results show that adding 1% coke powder can effectively improve the decomposition rate of desulfurization ash and reduce the generation of CaSO₄. Meanwhile,with the increasing of the addition proportion of pre-treated desulfurized ash,the assimilation temperature and bond phase strength of the iron ore increases first and then decreases, and the liquid phase fluidity increases monotonously. However,when the substitution ratio exceeds 40% the liquid phase fluidity creates the "false appearance" of great fluidity. The phase structure of the binding phase indicates that the suggested substitution ratio is less than 40%,which is beneficial to the formation of calcium ferrite in the quenched sample. Therefore,the best substitution ratio should be less than 40%.

Key words： semi-dry desulfurization ash pre-treatment iron ore sintering basic characteristic

Received: 08 April 2019

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	LUO Yun-fei
	QIAN Li-xin
	LONG Hong-ming
	ZHANG Yu-dong
	WEI Ru-fei

Cite this article:

LUO Yun-fei,QIAN Li-xin,LONG Hong-ming等. Effect of pretreatment sintering desulfurization ash addition on basic sintering characteristics of iron ore[J]. Iron and Steel, 2019, 54(12): 117-124.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190142 OR http://www.chinamet.cn/Jweb_gt/EN/Y2019/V54/I12/117

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