Effect of Andalusite Addition on Properties of Chrome-corundum Bricks

doi:10.19691/j.cnki.1004-4493.2020.02.004

China's Refractories ›› 2020, Vol. 29 ›› Issue (2): 21-24.DOI: 10.19691/j.cnki.1004-4493.2020.02.004

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Effect of Andalusite Addition on Properties of Chrome-corundum Bricks

XIA Wenbin, ZHAN Huasheng^*(), LI Jinyu, LI Yanjing, MA Shulong, SU Yuzhu, ZHANG Jili, GAO Changhe

Tongda Refractory Technologies Co., Ltd., Beijing 100043, China

Revised:2021-05-13 Online:2020-06-15 Published:2020-06-15
Contact: ZHAN Huasheng
About author:Xia Wenbin obtained his master's degree from University of Science and Technology Beijing in 2009. He mainly engages in refractory design, product research and application in cement kilns, blast furnace ironmaking, energy and environmental protection. In the field of hazardous waste disposal and ash melting, he has designed and significantly improved the service life of refractory products for hazardous waste disposal equipment, which applied in companies of Veolia Environmental Service Co., Ltd., SUEZNWS, Beijing Capital Stock Co. Ltd, and Beikong Group.

Abstract

Abstract:

In order to improve the thermal shock resistance of chrome-corundum bricks, different amounts of andalusite were added to the formulation of chrome-corundum bricks to replace the equivalent white fused corundum with the same particle size. After mixing, shaping, drying and firing, the density, the cold strength, the cold wear resistance, the hot modulus of rupture and the thermal shock resistance were tested. XRD, SEM and elemental surface scanning were used to characterize the specimens. The results show that: (1) the volume expansion of andalusite mullitization reduces the apparent porosity of chrome-corundum bricks; (2) the density and the hardness of mullite are lower than those of corundum so the decrease of the corundum content in brick leads to the decrease of the bulk density, the strength and the cold wear resistance; (3) the cross-distributed columnar mullite in the matrix can effectively improve the hot modulus of rupture and the thermal shock resistance of the specimens; (4) considering comprehensively, the andalusite addition shall not exceed 18%.

Key words: andalusite, chrome-corundum brick, hazardous waste processing rotary kiln, thermal shock resistance

XIA Wenbin, ZHAN Huasheng, LI Jinyu, LI Yanjing, MA Shulong, SU Yuzhu, ZHANG Jili, GAO Changhe. Effect of Andalusite Addition on Properties of Chrome-corundum Bricks[J]. China's Refractories, 2020, 29(2): 21-24.

Figures/Tables 7

References 8

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Starting materials	Al₂O₃	Cr₂O₃	SiO₂	Fe₂O₃	TiO₂	CaO	MgO	R₂O
White fused corundum	99.27	-	0.48	0.12	0.01	0.12	0.23	0.21
Andalusite	59.36	-	35.75	0.72	0.29	-	-	0.17
Alumina micropowder	99.65	-	0.03	0.10	-	-	-	0.40
Chrome oxide micropowder	84.52	13.81	0.57	-	-	0.03	-	0.23
Binding clay	32	-	49	1.4	1.66	-	-	0.3

Starting materials	Al₂O₃	Cr₂O₃	SiO₂	Fe₂O₃	TiO₂	CaO	MgO	R₂O
White fused corundum	99.27	-	0.48	0.12	0.01	0.12	0.23	0.21
Andalusite	59.36	-	35.75	0.72	0.29	-	-	0.17
Alumina micropowder	99.65	-	0.03	0.10	-	-	-	0.40
Chrome oxide micropowder	84.52	13.81	0.57	-	-	0.03	-	0.23
Binding clay	32	-	49	1.4	1.66	-	-	0.3

Starting materials		0^#	1^#	2^#	3^#	4^#
White fused corundum	5-3 and 3-1 mm	42	42	42	42	42
White fused corundum	≤1 and ≤0.074 mm	36	30	24	18	12
Andalusite	≤1 and ≤0.074 mm	0	6	12	18	24
Alumina micropowder		10	10	10	10	10
Chrome oxide micropowder		9	9	9	9	9
Binding clay		3	3	3	3	3

Starting materials		0^#	1^#	2^#	3^#	4^#
White fused corundum	5-3 and 3-1 mm	42	42	42	42	42
White fused corundum	≤1 and ≤0.074 mm	36	30	24	18	12
Andalusite	≤1 and ≤0.074 mm	0	6	12	18	24
Alumina micropowder		10	10	10	10	10
Chrome oxide micropowder		9	9	9	9	9
Binding clay		3	3	3	3	3

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Effect of Andalusite Addition on Properties of Chrome-corundum Bricks

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