Effect of Various Alumina Powders on Properties of Castables

doi:10.19691/j.cnki.1004-4493.2022.02.009

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 45-48.DOI: 10.19691/j.cnki.1004-4493.2022.02.009

Effect of Various Alumina Powders on Properties of Castables

SONG Yanan¹, WEI Guoping², CHEN Qin², SHUAI Hang¹, LIU Guangping², SHEN Mingke²^,^*(), CHEN Yaosheng¹, YU Yan², WANG Yulong², CAO Yaping²

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

Online:2022-06-15 Published:2022-07-05
Contact: SHEN Mingke
About author:Song Yanan is currently an R&D engineer in Zhejiang Zili Advanced Materials Corporation Limited. She graduated from Wuhan University of Science and Technology and received her master’s degree in Material Science, studying preparation and application on spinel-containing calcium aluminate cements. She has been working in Zhejiang Zili Advanced Materials Corporation Limited since her graduation and her current research focuses on designing refractory matrix materials, including reactive alumina, calcined alumina, spinel microfines, binders and additives.

Abstract

Abstract:

To satisfy the requirements of alumina castables in specific environment and enhance their properties, alumina castables were prepared using tabular alumina, various alumina powders (07RAL, 15RA, 22RABL, 40CA, 99-20um, and 99-325mesh), and calcium aluminate cement as main raw materials, and heat treating at 110, 1 000, 1 600 ℃, respectively. Their flowability and physical properties were tested, and the morphology was researched. The results show that compared with calcined alumina and tabular alumina powders, reactive alumina has higher specific surface area and better filling performance leading to lower water demand and higher viscosity, and the castables prepared with reactive alumina have higher CCS and CMOR after heat treating at 110, 1 000 and 1 600 ℃ as well as lower PLC than those with calcined alumina and tabular alumina powders.

Key words: alumina powder, castables, rheological property, construction time, sintering performance

SONG Yanan, WEI Guoping, CHEN Qin, SHUAI Hang, LIU Guangping, SHEN Mingke, CHEN Yaosheng, YU Yan, WANG Yulong, CAO Yaping. Effect of Various Alumina Powders on Properties of Castables[J]. China's Refractories, 2022, 31(2): 45-48.

Figures/Tables 10

Table 1 Chemical composition and physical properties of alumina powders for castables

	07RAL	15RA	22RABL	40CA	99-20um	99-325mesh
Al₂O₃/mass%	99.8	99.6	99.8	99.7	99.5	99.5
SiO₂/mass%	0.03	0.03	0.02	0.03	0.05	0.04
Fe₂O₃/mass%	0.01	0.01	0.01	0.01	0.02	0.02
Na₂O /mass%	0.06	0.27	0.08	0.18	0.35	0.33
d₅₀ /μm	0.67	1.52	2.39	4.07	4.69	13.5
d₉₀ /μm	2.86	5.76	7.56	9.73	21.3	35.0
Surface area-BET /(m² · g^-1)	6.25	2.65	2.95	1.04
Type			Bi-modal

Fig. 1 Water demand and viscosity of alumina powders

Fig. 2 Water demand and VIB flow value of castable samples with different alumina powders

Fig. 3 Apparent porosity of castable samples

Fig. 4 CMOR of castable samples

Fig. 5 CCS of castable samples

Fig. 6 PLC of castable samples

Fig. 7 SEM photograph of castable matrix with reactive alumina 07RAL

Fig. 8 SEM photograph of castable matrix with calcined alumina 40CA

Fig. 9 SEM photograph of castable matrix with tabular alumina 99-20um

References 8

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Effect of Various Alumina Powders on Properties of Castables

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