Improvement of Service Life of Small Furnace Covers on 150 t Refining Ladles

doi:10.19691/j.cnki.1004-4493.2020.01.008

China's Refractories ›› 2020, Vol. 29 ›› Issue (1): 40-43.DOI: 10.19691/j.cnki.1004-4493.2020.01.008

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Improvement of Service Life of Small Furnace Covers on 150 t Refining Ladles

ZHANG Liang^*()

Steelmaking Department of Tianjin Pipe Corporation, Tianjin 300301, China

Online:2020-01-10 Published:2020-01-10
Contact: ZHANG Liang
About author:Zhang Liang, born in 1985, graduated and gained his bachelor’s degree from Anhui University of Technology in 2008, majored in inorganic non-metallic materials engineering. Currently, he is working in the steelmaking plant of Tianjin Pipe Corporation as an engineer. He is mainly responsible for the steelmaking process, use of refractory materials and process research.

Abstract

Abstract:

The factors restricting the life of the refining furnace cover were introduced, including the airflow erosion of the refining dust removal system, the melting loss caused by the arc radiation of the electrode, the chemical erosion and penetration of slag and gas, and the condition of refining slag. The improvement measures are adjusting the material of the small furnace cover from corundum to chrome corundum, using a large shaking table to vibrate, optimizing the size design of the small furnace cover, and appropriately thickening the weak areas in the triangular area. The average service life of the refining furnace cover has been increased from one week to two months, reaching 4 maintenance cycles, which meets the needs of the refining production.

Key words: refining ladle, furnace cover, service life, measures

ZHANG Liang. Improvement of Service Life of Small Furnace Covers on 150 t Refining Ladles[J]. China's Refractories, 2020, 29(1): 40-43.

Figures/Tables 3

References 8

[1]	Zhang Meng . Improvement of lifting mechanism of LF ladle refining furnace cover. Technology Innovation and Application (in Chinese), 2019 (15):97-99.
[2]	Liu Xiangdong . Analysis of electrode and refractory ring of furnace cover of 3^# LF in Baosteel. Shandong Industrial Technology (in Chinese), 2019 (7): 51+27.
[3]	Xing Wanli . Optimization of water-cooled furnace cover structure for LF refining furnace. Plant Maintenance Engineering, 2017 (8):47-48.
[4]	Liang Yibing, Gong Bo . State of the art and development of refractories for stainless steel refining. Naihuo Cailiao (Refractories, in Chinese), 2013,47(4):294-297.
[5]	Su Tiansen . Problems in optimization of refractories for steel making. Naihuo Cailiao (Refractories, in Chinese), 2001,35(1):1-3.
[6]	Zhang Binggen . Development and application of unshaped refractories. Naihuo Cailiao (Refractories, in Chinese), 1997,31(5):302-304.
[7]	Hu Shiping, Gong Haitao, Jiang Zhiliang, Li Tingshou, Fang Zhengguo. Refractory Materials for Short-flow Steelmaking(in Chinese). Beijing: Metallurgical Industry Press, 2012: 37-38.
[8]	Wang Weibang. Technology of Refractory Materials(in Chinese). Beijing: Metallurgical Industry Press, 2007:50-51.

Item		Before improvement / corundum	After improvement / chrome corundum
Chemical composition /mass%	Al₂O₃	≥95	≥90
	Cr₂O₃		3-5
	SiO₂		<1.5
Cold crushing strength /MPa	110 ℃× 24 h	>60	>60
Cold crushing strength /MPa	1 500 ℃× 3 h	<100	>100
Cold modulus of rupture /MPa	110 ℃× 24 h	>6	>8
Cold modulus of rupture /MPa	1 500 ℃× 3 h	<10	<12
Bulk density /(g · cm^-3)	110 ℃× 24 h	3.60-3.80	3.10-3.20

Item		Before improvement / corundum	After improvement / chrome corundum
Chemical composition /mass%	Al₂O₃	≥95	≥90
	Cr₂O₃		3-5
	SiO₂		<1.5
Cold crushing strength /MPa	110 ℃× 24 h	>60	>60
Cold crushing strength /MPa	1 500 ℃× 3 h	<100	>100
Cold modulus of rupture /MPa	110 ℃× 24 h	>6	>8
Cold modulus of rupture /MPa	1 500 ℃× 3 h	<10	<12
Bulk density /(g · cm^-3)	110 ℃× 24 h	3.60-3.80	3.10-3.20

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Improvement of Service Life of Small Furnace Covers on 150 t Refining Ladles

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