Insulating Permanent Lining of Calcium Hexaluminate Based Castable for 300t Ladle in Baosteel

doi:10.19691/j.cnki.1004-4493.2021.01.006

China's Refractories ›› 2021, Vol. 30 ›› Issue (1): 35-40.DOI: 10.19691/j.cnki.1004-4493.2021.01.006

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Insulating Permanent Lining of Calcium Hexaluminate Based Castable for 300t Ladle in Baosteel

GAN Feifang¹^,^*(), GUO Zongqi², GAO Jianying³, GAO Hua¹

1 Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China
2 Trasteel International SA, Lugano CH-6900, Switzerland

Online:2021-03-15 Published:2021-05-01
Contact: GAN Feifang
About author:Gan Feifang has been engaged in research and development of refractory materials and applied technology for nearly 30 years, and has successively been in charge of and participated in more than 100 research projects of Baosteel. The main research directions are as follows: new technology development of energy-saving and environmental protection refractory materials for high-temperature metallurgical furnaces, development of refractories for smelting various steels, refractories for refining furnace and ladle, refractory materials for hot metal pretreatment and blast furnace taphole, clay development. The research results promote the technological progress of iron and steel metallurgy refractory materials.

Abstract

Abstract:

Minimizing of heat loss of liquid steel through the ladle lining led to the integration of increasing insulation function of the permanent lining and high-quality insulating layer between the permanent lining and the ladle steel shell. In this paper, a study was made on physical and thermomechanical properties and corrosion resistance of calcium hexaluminate based castables. The chemical and physical properties of CA₆ based castables fabricated in this work can fulfill general requirements of the permanent lining in ladle. The permanent linings of CA₆ based castables offer superb thermal insulation and corrosion resistance, compared to conventional refractory systems of 300t ladle in Baosteel. Both functions of insulation and safety work effectively in whole process of ladle operation.

Key words: insulating lining, ladle, calcium hexaluminate, permanent lining, castables

GAN Feifang, GUO Zongqi, GAO Jianying, GAO Hua. Insulating Permanent Lining of Calcium Hexaluminate Based Castable for 300t Ladle in Baosteel[J]. China's Refractories, 2021, 30(1): 35-40.

Figures/Tables 13

References 16

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CA₆ raw material	Chemical composition /mass%					Physical properties
CA₆ raw material	SiO₂	Al₂O₃	Fe₂O₃	CaO	R₂O	AP/%	WA/%	BD/ (g · cm^-3)
CA6N1	0.50	90.00	0.08	7.70	0.09	26.8	9.9	2.70
CA6N2	0.11	91.90	0.04	7.50	0.04	25.5	9.2	2.78

CA₆ raw material	Chemical composition /mass%					Physical properties
CA₆ raw material	SiO₂	Al₂O₃	Fe₂O₃	CaO	R₂O	AP/%	WA/%	BD/ (g · cm^-3)
CA6N1	0.50	90.00	0.08	7.70	0.09	26.8	9.9	2.70
CA6N2	0.11	91.90	0.04	7.50	0.04	25.5	9.2	2.78

Additional raw material	Chemical composition /mass%					Particle size/µm
Additional raw material	SiO₂	Al₂O₃	Fe₂O₃	CaO	TiO₂	Particle size/µm
Tabular alumina	0.08	99.44	0.04	0.14	0.02	< 45
Calcined alumina	0.01	99.84	0.02	0.07	0.02	< 5
Calcium aluminate cement	0.20	69.19	0.06	29.92	MgO: 0.22	< 20

Additional raw material	Chemical composition /mass%					Particle size/µm
Additional raw material	SiO₂	Al₂O₃	Fe₂O₃	CaO	TiO₂	Particle size/µm
Tabular alumina	0.08	99.44	0.04	0.14	0.02	< 45
Calcined alumina	0.01	99.84	0.02	0.07	0.02	< 5
Calcium aluminate cement	0.20	69.19	0.06	29.92	MgO: 0.22	< 20

Castable	Chemical composition /mass%					Bulk density/ (g · cm^-3)	Apparent porosity/%	CCS/ MPa	CMOR/ MPa
Castable	SiO₂	Al₂O₃	MgO	Fe₂O₃	CaO	Bulk density/ (g · cm^-3)	Apparent porosity/%	CCS/ MPa	CMOR/ MPa
CA6N1	0.18	89.59	0.21	0.11	8.41	2.62	25	51.1	16
CA6N2	-	-	-	-	-	2.63	23	47.9	14.7
High alumina	19.28	69.88	3.92	1.43	2.30	2.85	11	105.5	10

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Insulating Permanent Lining of Calcium Hexaluminate Based Castable for 300t Ladle in Baosteel

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Figures/Tables 13

References 16

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Physical properties and their testing conditions		CA6N1 castable	CA6N2 castable	High alumina castable
Apparent porosity/%	1 500 °C × 3 h	32	31	13
Bulk density/(g · cm^-3)	1 500 °C × 3 h	2.55	2.56	2.76
Modulus of rupture/MPa	1 500 °C × 3 h	31.6	30.8	12.6
Cold crushing strength/MPa	1 500 °C × 3 h	161.8	177.5	95.5
Permanent linear change/%	1 500 °C × 3 h	0	+0.01	+1.3
Hot modulus of rupture/MPa	1 400 °C × 1 h	16.2	17.8	< 3
Thermal shock resistance/cycle	1 100 °C-water cooling	30	30	30
Thermal conductivity/(W · m^-1 · K^-1)	500 °C in average	0.50	0.51	0.69

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