Development and Application of Carbon-free Al2O3-MgO Dense Bricks for Steel Ladles

doi:10.19691/j.cnki.1004-4493.2022.02.007

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 35-39.DOI: 10.19691/j.cnki.1004-4493.2022.02.007

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Development and Application of Carbon-free Al₂O₃-MgO Dense Bricks for Steel Ladles

LUO Ming¹^,^*(), FANG Binxiang¹, WEI Guoping¹, LIU Guangping¹, SHEN Mingke¹, SONG Yanan²

1 Zhejiang Zili High Temperature Technology Co., Ltd., Shaoxing 312300, China
2 Zhejiang Zili Advanced Materials Co., Ltd., Shaoxing 312300, China

Online:2022-06-15 Published:2022-07-05
Contact: LUO Ming
About author:Luo Ming obtained his doctor’s degree of Materials Science in Wuhan University of Science and Technology, China in 2013. Between 2013 and 2014, he worked as an engineer in R&D department of RHI Magnesita in Dalian. Since 2015, he has been working in R&D department of Zhejiang Zili High Temperature Technology Co., Ltd., mainly focusing on shaped refractories in the iron and steel production field.

Abstract

Abstract:

Carbon-free Al₂O₃-MgO dense bricks were produced by the pressing method, using tabular alumina, white fused alumina, alumina micro-powder as main raw materials, and inorganic powder as the binder. The comprehensive properties and performance in steel ladle side wall were made a comparison between Al₂O₃-MgO dense bricks and precast blocks. The results show that Al₂O₃-MgO dense bricks exhibit high dense structure and strength, as well as superior thermal shock resistance and better penetration and corrosion resistance to slag than precast blocks. While replacing precast blocks with dense bricks in 250 t steel ladle side wall in some domestic steel mills, the thickness of the metamorphic layer from slag penetration and the corrosion rate decrease evidently. The damage of dense bricks during service is mainly caused by the corrosion from molten steel and slag, and the structure spalling of the metamorphic layer also plays an important role.

Key words: refining ladle, alumina-magnesia material, carbon-free dense brick, precast block, damage mechanism

LUO Ming, FANG Binxiang, WEI Guoping, LIU Guangping, SHEN Mingke, SONG Yanan. Development and Application of Carbon-free Al₂O₃-MgO Dense Bricks for Steel Ladles[J]. China's Refractories, 2022, 31(2): 35-39.

Figures/Tables 8

Fig. 1 Cross-sectional photos of samples A and B

Table 1 Chemical composition of samples A and B /mass%

Sample	Al₂O₃	MgO	SiO₂
A	93.50	4.20	0.80
B	94.50	3.50	0.20

Table 2 Physical properties of samples A and B at different temperatures

Sample	Treatment condition	AP /%	BD /(g · cm^-3)	CCS /MPa	PLC /%	HMOR (1 450 ℃×1 h) /MPa
A	110 ℃ ×24 h	13.7	3.13	90.5	-	2.5
B	110 ℃ ×24 h	8.5	3.28	134.8	-	4.3
A	1 000 ℃ ×3 h	15.1	3.12	48.3	+0.01	-
B	1 000 ℃ ×3 h	12.8	3.22	63.7	+0.09	-
A	1 600 ℃ ×3 h	17.4	3.03	80.0	+0.52	-
B	1 600 ℃ ×3 h	13.1	3.18	95.0	+0.29	-

Fig. 2 Appearances of samples A (left) and B (right) after different cycles of thermal shock

Fig. 3 Cross-sectional photos of samples A (left) and B (right) after slag resistance test

Fig. 4 Photos of dense bricks used in side wall at hot (left) and cold state (right) after 150 heats

Fig. 5 Cross-sectional photos of used precast block and dense brick

Fig. 6 SEM photographs of used dense brick

References 6

[1]	Yang Zou, Huazhi Gu, Ao Huang, Meijie Zhang, Chao Ji. Effects of MgO micropowder on microstructure and resistance coefficient of Al₂O₃-MgO castable matrix. Ceramics International, 2014, 40(5): 7023-7028. DOI URL
[2]	Sako E. Y., Braulio M. A. L., Pandolfelli V. C. The corrosion resistance of microsilica-containing Al₂O₃-MgO and Al₂O₃-spinel castables. Ceramics International, 2012, 38(6): 4783-4789. DOI URL
[3]	Tomba M A G, Lu A P, Braulio M A L, Pandolfelli V. C. Al₂O₃-based binders for corrosion resistance optimization of Al₂O₃-MgAl₂O₄ and Al₂O₃-MgO refractory castables. Ceramics International, 2015, 41(8): 9947-9956. DOI URL
[4]	Swe-Kai Chen, Min-Yuan Cheng, Su-Jien Lin, Yung-Chao Ko. Thermal characteristics of Al₂O₃-MgO and Al₂O₃-spinel castables for steel ladles. Ceramics International, 2002, 28(7): 811-817. DOI URL
[5]	Wang Tao, Gan Feifang. Research on mechanical pressed dense Al₂O₃-MgO brick for steel ladle. Refractories & Lime, 2019, 44(5): 6-8. (in Chinese)
[6]	Wan Hongling. Research and application of unfired carbon-free corundum-spinel bricks for ladle. Naihuo Cailiao (Refractories, in Chinese), 2013, 47(4): 287-290.

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Development and Application of Carbon-free Al₂O₃-MgO Dense Bricks for Steel Ladles

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