Effect of ZnO Precursor on Properties of Calcium Aluminate Cement Bonded Corundum Castables

doi:10.19691/j.cnki.1004-4493.2021.04.007

China's Refractories ›› 2021, Vol. 30 ›› Issue (4): 36-39.DOI: 10.19691/j.cnki.1004-4493.2021.04.007

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Effect of ZnO Precursor on Properties of Calcium Aluminate Cement Bonded Corundum Castables

GUO Liu, ZHAO Zongqiang, MA Junhua, CHEN Liugang

Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

Online:2021-12-15 Published:2021-12-10
About author:Guo Liu, born in 1997, obtained her bachelor’s degree from Liaoning University in 2019, majored in inorganic non-metallic materials. She is currently studying for her master’s degree in Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University. Her research focuses on the hydration behavior of hydratable alumina and preparation and application of high alumina based refractory castables.

Abstract

Abstract:

Calcium aluminate cement (CAC) bonded corundum based castables were prepared using tabular corundum and activated alumina as the starting materials, CAC as the binder, zinc hydroxide (Zn(OH)₂) and basic zinc carbonate (BZC) as the ZnO precursors. The effects of the two ZnO precursors on the phase composition and the microstructure of the CAC bonded corundum based castable matrix specimens were analyzed, and the reasons affecting the hot performance of the castables were studied. The results show that Zn(OH)₂with a smaller particle size (d₅₀=1.26 μm) is prone to agglomerate during sample preparation and generates ZnAl₂O₄ spinel grains after firing, hindering the growth of CA₆, thus decreasing the mechanical strength of the castables. BZC with a larger particle size (d₅₀=2.91 μm), which shows a sound dispersity, in-situ generates nano-sized ZnO after firing, and ZnO or Zn ²⁺ diffuses into calcium aluminates, promoting the sintering of CA₂ and CA₆, thereby enhancing the hot properties of the CAC-bonded corundum based castables.

Key words: calcium aluminate cement, corundum based castables, zinc hydroxide, basic zinc carbonate, zinc oxide, hot properties

GUO Liu, ZHAO Zongqiang, MA Junhua, CHEN Liugang. Effect of ZnO Precursor on Properties of Calcium Aluminate Cement Bonded Corundum Castables[J]. China's Refractories, 2021, 30(4): 36-39.

Figures/Tables 7

Table 1 Formulations of corundum castables bonded with CAC

Raw materials		mass /%
Raw materials		CZ0	CZ1-0.3	CZ1-0.45	CZ1-0.6	CZ2-0.33	CZ2-0.5	CZ2-0.66
Tabular corundum	3-6, 1-3, 0.5-1, ≤0.5 mm	73	73	73	73	73	73	73
Tabular corundum	≤0.045 mm	14	13.7	13.55	13.4	13.67	13.5	13.34
Active alumina	CL370	8	8	8	8	8	8	8
CAC		5	5	5	5	5	5	5
Zn(OH)₂		0	0.3	0.45	0.6	0	0	0
BZC		0	0	0	0	0.33	0.5	0.66
FS10 (extra adding)		0.15	0.15	0.15	0.15	0.15	0.15	0.15
Water (extra adding)		4.2	4.2	4.2	4.2	4.2	4.2	4.2

Fig. 1 Particle size distribution of two ZnO precursors

Fig. 2 Appearance of two ZnO precursors

Fig. 3 XRD patterns of CAC-bonded castable matrix specimens with different ZnO precursors after firing at 1 550 °C

Fig. 4 SEM images of CAC-bonded castable matrix specimens with different ZnO precursors after firing at 1 550 °C

Fig. 5 CMOR and CCS of CAC bonded castables with different ZnO precursors after firing at 1 550 °C

Fig. 6 HMOR at 1 550 ℃ of CAC bonded castables with different ZnO precursors

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Effect of ZnO Precursor on Properties of Calcium Aluminate Cement Bonded Corundum Castables

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