基于高FeO转炉渣的钢液脱磷行为

doi:10.13228/j.boyuan.issn0449-749x.20200528

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Abstract In order to study the dephosphorization behavior of molten steel under the condition of high FeO converter slag, the industrial test of dephosphorization with high oxidizing converter slag was carried out on a 300 t dephosphorization converter of a steel plant by the duplex method. The influence of dephosphorization temperature, phase structure of converter slag and final slag composition on the dephosphorization of molten steel under high FeO converter slag was studied by means of theoretical analysis and XRD and Raman spectrum analysis. Through thermodynamic formula calculation, it is found that the optimal theoretical dephosphorization temperature of the converter is about 1 675 K. The mineral phase structures of the converter slag with different dephosphorization effects were compared and analyzed. The results showed that the mineral phase structures of 2CaO·SiO₂ and 3CaO·P₂O₅ were conducive to the dephosphorization reaction, while the influence of 3CaO·SiO₂ on the dephosphorization effect was not obvious. The larger the characteristic peak area of Si—O—Si and [FeO₄], the smaller the characteristic peak area of Q⁰ and Q² units, the better the dephosphorization effect. Finally, the optimum process parameters for controlling the final slag composition when the dephosphorization rate of molten steel in dephosphorization furnace is ≥60% are as follows, basicity R=1.05-1.30, w([FeO])=33%-37%, w([MgO])≤3.0%, w([MnO]) =4.3%-5.4%. This study can provide a theoretical basis and technical guidance for iron and steel enterprises to develop ultra-low phosphorus steel by the double method.

Key words： duplex method Raman spectral dephosphorization rate mineral phase structure ultra-low phosphorus steel

Received: 19 October 2020

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	Articles by authors
	ZHOU Chao-gang
	HU Jin-zhen
	CHEN Hu
	AI Li-qun
	ZHAO Chang-liang
	WANG Shu-huan

Cite this article:

ZHOU Chao-gang,HU Jin-zhen,CHEN Hu等. Dephosphorization behavior of molten steel based on high FeO converter slag[J]. Iron and Steel, 2021, 56(7): 63-74.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200528 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I7/63

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