Preparation And Properties Of The Silicon Slag Glass-ceramic Research

With the rapid development of world economy, stimulating the rapid growth of oil catalytic cracking catalyst industry, discharged deposition silicon slag increased in the process of petroleum catalyst industry. Silicon slag raises a lot of land, polluting the environment and harming to human survival, therefore, how to effectively take care of silicon slag has become a challenging issue.Firstly, the influence of basic glass on crystallization behavior was studied through the analysis of different kinds and content of the nucleation agent on the phases and properties of silicon slag glass-ceramic material to determine the best nucleation agent and its content. Secondly, the crystallization kinetics and crystallization behavior of slag glass-ceramics were investigated by using the differential thermal analysis (DTA) and calculating the kinetic parameters of crystallization, predicting judgment based on the crystallization ability of silicon slag glass to explain its crystallization behavior. And then the impact of phases, microstructure and properties of glass-ceramic on the heat treatment temperature and time was examined by X-ray diffractometer (XRD) and scanning electron microscope (SEM). Properties such as flexural strength, microhardness were tested and analyzed under different heat treatment temperature and time to decide the optimum heat treatment temperature and time. Finally, the impact of phases, microstructure and properties on silicon slag content was examined for silicon slag glass-ceramic through the analysis of XRD and SEM photos to explain the change of the performances and determine the best silicon slag content.The results demonstrate that, the best nucleation agent for silicon slag glass-ceramic was TiO2 and best content is 5%. The crystallization activation energy E increasing gradually showed that the crystallization ability gradually declines with the increase of the content of silicon slag. The content of phases and grain diameter was slightly growing with the increase of heat treatment temperature. Microstructure was spherical particles. The silicon slag glass-ceramic would develop the most dense microstructure and optimal performances at the best heat treatment temperature of 900 ℃. The phenomenon was likewise comparable under the separate heat treatment time. The silicon slag glass-ceramic would develop the densest microstructure and optimal performances at the best heat treatment time of 1.5h. The content and variety of phases gradually reduced with the increase of the content of silicon slag. The silicon slag glass-ceramic got the best performances, which’s microstructure was the densest at the optimal silicon slag content of 70%.Silicon slag glass-ceramic could get the best performances:flexural strength was 295.2 MPa; Microvicars hardness was 989.72 MPa; the chemical corrosion resistance was in 0.09%; the density was 2.78g/cm3 after optimum heat treatment temperature of 900 ℃ and the time after 1.5h. The glass-ceramic of 90% silicon slag content took up its performances limit: flexural strength was 123.3 MPa; Microvicars hardness was 640.1 MPa; the chemical corrosion resistance was in 0.34%; the density was 2.51g/cm3.