Abstract

Title Study on hot Al resistance of Al2O3-SiO2 castables with different Al2O3 content
Thematic area Nonferrous Metallurgy
Presenter Dr. Zhanmin Wang
Authors Dr. Zhanmin Wang, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Mr. Sanhua Zhang, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Mr. Shuhe Hu, Henan University of Science and Technology, Luoyang - China
Mr. Shaofei Li, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Mr. Huiying Shi, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Dr. Xiying Cao, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Mrs. Lingyan Yu, State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research, Luoyang - China
Abstract

The working linings of melting furnace and holding furnace in aluminum industry are usually damaged by the attack of hot Al and its alloy. In order to improve service performance of the lining, hot aluminum resistance of Al2O3-SiO2 castables with different Al2O3 content was investigated by crucible method and immersion method. The microstructure of Al2O3-SiO2 castable corroded by hot aluminum was also analyzed by means of SEM and EDAX. The results showed that: (1) With the increase of Al2O3 content, the hot aluminum resistance of the castable indicates better. (2) The hot aluminum resistance of the castable seems worse with the heat treatment temperature 1100°C compared with 110°C, 800°C and 1400°C. (3) After hot aluminum penetrated into the interior of castables, Al and even Mg react with SiO2 in quartz and mullite, and SiO2 is reduced to Si, but Al and Mg are oxidized into Al2O3 and MgO; MgO further reacts with Al2O3 to produce spinel resulting in structural damage of the sample. For the Al2O3-SiO2 castable with higher Al2O3 content, the layer of the formation of spinel is densified and could prevent hot aluminum from penetration further.