Effect of Gahnite on Properties of High Alumina Castable

Abstract

Abstract: In this paper, gahnite (ZnAl₂O₄) was prepared with solid phase reaction by ZnO and Al₂O₃ as raw materials. The micro-structure change of ZnAl₂O₄ was researched when ZnO/Al₂O₃ molar ratios were 1.0:0.9, 1.0:1.0 and 1.0:1.1, respectively. In addition, the effect of ZnAl₂O₄ on properties of high alumina castables were studied. The results show that when the molar ratio of ZnO to Al₂O₃ is 1.0:0.9, due to the excessive ZnO, it volatilizes because of the removal of O^2- to produce liquid phase, and the surface of ZnAl₂O₄ particles is microporous structure. When the molar ratio of ZnO and Al₂O₃ is 1.0:1.0 (standard molar ratio), the surface of ZnAl₂O₄ particles with standard molar ratio is smooth. The lattice strain value (0.085 86) of standard molar ratio ZnAl₂O₄ is the smallest, which can capture more manganese ions and iron ions in steel slag. When the molar ratio of ZnO to Al₂O₃ is 1.0:1.1, the surface of ZnAl₂O₄ particles is rough. The high alumina castable with standard molar ratio ZnAl₂O₄ has denser structure, highest strength and best slag resistance.

Key words: gahnite, castable, solid phase reaction, micro-structure, mechanical property, slag resistance

CLC Number:

TQ175

HAN Jun, LIU Rui, LYU Lihua. Effect of Gahnite on Properties of High Alumina Castable[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4518-4523.

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