Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables

doi:10.19691/j.cnki.1004-4493.2020.01.006

China's Refractories ›› 2020, Vol. 29 ›› Issue (1): 31-35.DOI: 10.19691/j.cnki.1004-4493.2020.01.006

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Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables

ZHANG Xiaohui¹^,^*(), YU Xingguo¹^,³, WANG Baoyu², ZHU Boquan³

1 Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
2 Jiangsu Chianaref Refractory Co., Ltd., Yixing 214266, China
3 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Online:2020-01-10 Published:2020-01-10
Contact: ZHANG Xiaohui
About author:Zhang Xiaohui was born in 1979. She obtained her bachelor’s degree with the major of inorganic nonmetallic materials in 2001 and master’s degree with the major of materials science in 2004 from Xi’an University of Architecture & Technology. From 2004 to the end of 2005, she worked in Xi’an Qinxiang Technology Co., Ltd. Since 2006, she has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd.

Abstract

Abstract:

In order to improve the flow ability and early-stage strength of colloidal alumina bonded corundum castables, the colloidal alumina with 20% of solid content was used as the binder, and tabular corundum aggregates and fines, and active alumina micropowder CL370 as the main starting materials. Influences of setting accelerating agents (magnesia fines and sodium meta-aluminate) on the linear change rate, the modulus of rupture and the microstructure of corundum castables after different heat-treatments were researched. The results show (1) cement bonded corundum castables have the highest modulus of rupture after 24 h of demolding, and colloidal alumina bonded corundum castables have the lowest one; both magnesia fines and sodium meta-aluminate can improve the strength after 24 h of demolding; (2) after firing at 1 000 ℃ for 3 h, the modulus of rupture of all specimens decreases, even lower than that after 24 h of demolding; (3) after firing at 1 600 ℃ for 3 h, the castable specimen added with 0.1 mass% magnesia fines has the highest modulus of rupture; the tabular phases appear interwovenly in the specimen; (4) taking the comprehensive properties into account, 0.1 mass% of magnesia fines is appropriate, and the addition of sodium meta-aluminate shall be lower than 0.3%.

Key words: corundum, colloidal alumina, setting accelerating agent, magnesia fines, sodium meta-aluminate

ZHANG Xiaohui, YU Xingguo, WANG Baoyu, ZHU Boquan. Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables[J]. China's Refractories, 2020, 29(1): 31-35.

Figures/Tables 13

Table 1 Formulations for specimens /mass%

Starting materials	A0#	A1#	A2#	A3#	A4#	A5#	A6#	A7#	C#
Tabular corundum (6-3 mm)	23	23	23	23	23	23	23	23	23
Tabular corundum (3-1 mm)	23	23	23	23	23	23	23	23	23
Tabular corundum (≤1 mm)	24	24	24	24	24	24	24	24	24
Tabular corundum (≤0.044 mm)	23	23	23	23	23	23	23	23	23
CL370 micropowder	7	7	7	7	7	7	7	7	7
Colloidal alumina (extra-adding)	6	6	6	6	6	6	6	6
Water (extra-adding)	1	1	1	1	1	1	1	1	5
Urea (extra-adding)		0.50	0.50	0.50	0.50	0.50	0.50	0.50
Secar 71 (extra-adding)									3
Magnesia fines (≤0.061 mm) (extra-adding)			0.10	0.20	0.30
Sodium meta-aluminate (extra-adding)						0.05	0.10	0.30

Table 2 Flow values of corundum castables with different formulations

Specimen No.	A0#	A1#	A2#	A3#	A4#	A5#	A6#	A7#	C#
Flow value /mm	171	184	180	178	173	175	166	158	192

Fig.1 Modulus of rupture of specimens after 24 h of demolding

Fig. 2 Modulus of rupture of specimens after drying at 110℃ for 24 h

Fig. 3 Section morphology of colloidal alumina bonded corundum castable specimen after drying at 110 ℃ for 24 h (A3# with 0.5% urea and 0.2% magnesia fines)

Fig. 4 Section morphology of colloidal alumina bonded corundum castable specimen after drying at 110 ℃ for 24 h (A1# with 0.5% urea)

Fig. 5 Modulus of rupture of specimens fired at 1 000 ℃ for 3 h

Fig. 6 Linear change rate of specimens after firing at 1 600 ℃ for 3 h

Fig. 7 Modulus of rupture of specimens after firing at 1 600 ℃ for 3 h

Fig. 8 Section morphology of cement bonded corundum castable specimen after firing at 1 600 ℃ for 3 h

Fig. 9 EDS pattern of tabular phase in cement bonded corundum castable specimen after firing at 1 600 ℃ for 3 h

Fig. 10 Section morphology of colloidal alumina bonded corundum castable specimen with 0.1% magnesia fines after firing at 1 600 ℃ for 3 h

Fig. 11 EDS pattern of tabular phase in colloidal alumina bonded corundum castable specimen with 0.1% magnesia fines after firing at 1 600 ℃ for 3 h

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Influence of Setting Accelerating Agents on Properties of Colloidal Alumina Bonded Corundum Castables

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