Innovative Lining of Unburnt Al2O3-MgO Brick for 300t Steel Ladle in Baosteel

doi:10.19691/j.cnki.1004-4493.2021.01.003

China's Refractories ›› 2021, Vol. 30 ›› Issue (1): 17-22.DOI: 10.19691/j.cnki.1004-4493.2021.01.003

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Innovative Lining of Unburnt Al₂O₃-MgO Brick for 300t Steel Ladle in Baosteel

GAN Feifang¹^,^*(), GUO Zongqi², GAO Jianying³, WANG Tao¹, WANG Zhaohui⁴

1 Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China
2 Trasteel International SA, Lugano CH-6900, Switzerland
3 Imerys (China) Co., Ltd., Tianjin 300457, China
4 Zhaohui Energy-Saving Technology Co., Ltd., Tieling 112000, China

Online:2021-03-15 Published:2021-05-01
Contact: GAN Feifang
About author:Gan Feifang, a professorship senior engineer, is the chief researcher of refractories in the Central Research Institute of Baosteel. She has been engaged in R & D and application technology research of refractories for iron and steel metallurgy for a long time, and has in-depth research on refractories for coking, iron-making and steel-making systems. She has 50 patents and published more than 30 papers. She has won one First Prize of Science and Technology Award of Metallurgical Industry, one first prize and two second prizes of major technological innovation achievements of China Baowu Group Company and one third prize of Shanghai Science and Technology Award. At present, she is in the Expert Committee of The Association China Refractory Industries, is Vice Chairman of Refractories Standardization Technical Committee of Chinese Society for Metals, and is in the 9^th Editorial Board of Naihuo Cailiao (Refractories, in Chinese, Bimonthly).

Abstract

Abstract:

The manufacture of clean steel needs high performance carbon-free bricks for ladle lining. Based on long term application experiences of the prefab Al₂O₃-MgO blocks, unburnt Al₂O₃-MgO brick has been developed by pressing a mix of alumina, spinel and magnesia as major raw materials and Al₂O₃-MgO gel powder as binder. In addition to low open porosity and high strength, the unburnt Al₂O₃-MgO brick shows superior corrosion resistance and thermal shock resistance to the prefab block. Field trials in a 300t steel ladle have indicated the residual lining of unburnt Al₂O₃-MgO bricks showed smooth surface without large spalling and seldom steel infiltration, consequently longer service life than the prefab blocks. The reliable, unburnt Al₂O₃-MgO bricks have more advantages of high efficiency, energy-saving and eco-friendly production. It will be one of the best options for ladle lining in the manufacture of high-purity steel.

Key words: unburnt Al₂O₃-MgO bricks, carbon-free, pressing, clean steel, refining ladle

GAN Feifang, GUO Zongqi, GAO Jianying, WANG Tao, WANG Zhaohui. Innovative Lining of Unburnt Al₂O₃-MgO Brick for 300t Steel Ladle in Baosteel[J]. China's Refractories, 2021, 30(1): 17-22.

Figures/Tables 13

References 12

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Raw materials	Chemical composition /mass% (LOI-free)						Bulk density / (g·cm^-3)
Raw materials	SiO₂	Al₂O₃	MgO	Fe₂O₃	CaO	R₂O	Bulk density / (g·cm^-3)
Tabular alumina	0.08	98.93	0.02	0.04	0.14	0.27	3.58
White fused alumina	0.23	99.12	0.02				3.45
Fused MA spinel	0.24	77.35	21.78	0.23	0.33	0.21	3.41
Calcined alumina	0.07	99.34	0.01	0.02	0.07	0.08	D₅₀< 5 µm
Fused magnesia	1.06	0.18	96.82	0.31	1.84		3.53
Calcium aluminate cement	0.28	70.04		0.13	29.41	0.26	< 15 µm
G3297BX gel powder	0.65	5.97	91.10	0.42	1.03	0.35	LOI = 47.85%

Raw materials	Chemical composition /mass% (LOI-free)						Bulk density / (g·cm^-3)
Raw materials	SiO₂	Al₂O₃	MgO	Fe₂O₃	CaO	R₂O	Bulk density / (g·cm^-3)
Tabular alumina	0.08	98.93	0.02	0.04	0.14	0.27	3.58
White fused alumina	0.23	99.12	0.02				3.45
Fused MA spinel	0.24	77.35	21.78	0.23	0.33	0.21	3.41
Calcined alumina	0.07	99.34	0.01	0.02	0.07	0.08	D₅₀< 5 µm
Fused magnesia	1.06	0.18	96.82	0.31	1.84		3.53
Calcium aluminate cement	0.28	70.04		0.13	29.41	0.26	< 15 µm
G3297BX gel powder	0.65	5.97	91.10	0.42	1.03	0.35	LOI = 47.85%

Al₂O₃-MgO materials	Chemical composition /mass%						Bulk density / (g·cm^-3)	Apparent porosity /%	CCS /MPa
Al₂O₃-MgO materials	SiO₂	Al₂O₃	MgO	Fe₂O₃	CaO	R₂O	Bulk density / (g·cm^-3)	Apparent porosity /%	CCS /MPa
Unburnt brick A	1.06	88.79	5.36	0.19	0.14	0.23	3.28	9	105
Prefab block B	0.09	93.15	3.92	0.07	0.6	0.10	3.12	15	94

Al₂O₃-MgO materials	Chemical composition /mass%						Bulk density / (g·cm^-3)	Apparent porosity /%	CCS /MPa
Al₂O₃-MgO materials	SiO₂	Al₂O₃	MgO	Fe₂O₃	CaO	R₂O	Bulk density / (g·cm^-3)	Apparent porosity /%	CCS /MPa
Unburnt brick A	1.06	88.79	5.36	0.19	0.14	0.23	3.28	9	105
Prefab block B	0.09	93.15	3.92	0.07	0.6	0.10	3.12	15	94

Slag type and steel	Chemical composition /mass%
Slag type and steel	SiO₂	Al₂O₃	MgO	CaO	Total Fe
Slag from BOF	13.90	1.47	12.24	46.35	20.70
Refining slag from ladle	34.24	15.63	8.87	20.31	17.70
Molten steel	Si	Al	C	P	Fe
Molten steel	3.12	5.10	0.06	0.03	90.11

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Innovative Lining of Unburnt Al₂O₃-MgO Brick for 300t Steel Ladle in Baosteel

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