应用低钛高炉渣的半钢炼钢:脱磷热力学与工业试验

doi:10.11896/j.issn.1005-023X.2018.04.031

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Abstract In order to comprehensively utilize low-titanium slag and improve the dephosphorization rate of semi-steel steelma-king, the semi-steel slag ball made of low-titanium slag with injecting CO₂ desulfurization treatment and 25%—30% of the oxide scale was used for semi-steel melting. The dephosphorization thermodynamic model of semi-steel slag system and the method of industrial test were established and conducted to study the dephosphorization and metallurgical impact of semi-steel slag ball. The results indicated that the dephosphorizing capacity would be reduced with increasing w(TiO₂) and w(Al₂O₃), especially under the low temperature and low alkalinity conditions. Compared with Al₂O₃, the TiO₂ can reduce the dephosphorization of slag more. The lgL_p and lgC_p increased first and then almost invariant with increasing alkalinity, increased first and then decreased as w(FeO) increase, and decreased with the w(MgO) increase. When the semi-tempered slag ball was used in semi-steel steelmaking, the w(TiO₂+Al₂O₃) and w(FeO) of slag increased and the basicity and MgO decreased. The optimum condition for semi-steel smelting is that the basicity of slag is about 4.0 and the proportion of semi-tempered slag ball is 15.0%—20.0 % of total slag, and this will result in relatively high lgL_p and lgC_p of slag, as well as relatively low adverse influence of w(TiO₂+Al₂O₃) on lgL_p and lgC_p. The early stage dephosphorization rate can be increased to 58.59%, which is 1.57 times of that of the original smelting process. Besides, the per ton lime consumption and the [O] in final steel decrease by 3.48 kg·t ^-1and 112×10^-6, respectively.

Key words： low titanium blast furnace slag BOF steel making semi-steel slag coexistence theory dephosphorization

Published: 25 February 2018 Online: 2018-02-25

CLC number:

TF711

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	Articles by authors
	WANG Baohua
	ZHU Rong
	HUANG Shiping
	GONG Yongyu
	WANG Shizhao
	ZHANG Mingbo

Cite this article:

WANG Baohua,ZHU Rong,HUANG Shiping, et al. Applying Low Titanium Blast Furnace Slag to Semi-steel Steelmaking: Dephosphorization Thermodynamics and Industrial Experiment[J]. Materials Reports, 2018, 32(4): 662-671.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.04.031 OR https://www.mater-rep.com/EN/Y2018/V32/I4/662

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