JIAO Zhiwei 1, LIU Wei 1, ZHOU Wei 1, LIU Yin2,3, LIU Xiaole 2,3, LIU Fengbin 1, CAO Leigang 1
(1. College of Mechanic and Materials Engineering, North China University of Technology, Beijing 100144, China; 2. Gansu Testing Technologies Co. Ltd, Lanzhou 730020, Gansu, China; 3. Gansu Provincial Key Laboratory of Fine Chemicals, Lanzhou 730020, Gansu, China)
Abstract: Aluminum dross after the removal of soluble salts through "water washing" was used as the main raw material to develop glass-ceramics, where the basic glass was prepared by using the conventional melting method at 1550 ℃. The aluminum dross glass-ceramics, CaO-MgO-Al2O3-SiO2 (CMAS), were obtained after the heat treatment process to induce nucleation (780 ℃ for 3 h) and crystallization (880 ℃ for 3 h). The main crystalline phase of the glass-ceramics is anorthite, the secondary phases include olivine and spinel. The effect of aluminum dross on crystallization behavior, microstructure and density of the glass-ceramics was studied, by using XRD, DTA, SEM and physical/chemical property tests. It was found that the glass-ceramics exhibited high densities and had no water absorption. Hardness of the glass-ceramics was increased with increasing content of aluminum dross. In addition, the acid corrosion resistance was decreased, while the alkali corrosion resistance was enhanced.
Key words: pretreated aluminum dross; glass-ceramics; anorthite; hardness; acid and alkali corrosion resistance