Preparation and Properties of Ca0-Mg0-Al_2O_3-SiO_2 Glass-Ceramics from Granite Wastes

摘要

Granite process industry generates a large amount of wastes, which pollute and damage the environment. This work aims to investigate the possibilities of using the granite sawing wastes in the production of glass-ceramics. Granite wastes with other components were used to prepare glass-ceramics. The crystallization behavior and properties of the glass-ceramics were investigated. The results showed that the activation energy for crystallization (E_c) was 463 kJ/mol and Avrami parameter (n) was 2.68, suggested a two dimension crystal growth mechanism. The main crystalline phase of all the obtained glass-ceramics was diopside. With the increase of heat treatment temperature, the diffraction peak intensity of diopside firstly increased and then decreased slightly. The minor crystalline phases spinel and Mg_4Al_2Ti_9O_(25) were observed above 970℃. When heated at 970 ℃ for 1h, the sample exhibited the highest Vicker's hardness and bending strength values, 7.3 GPa and 151 MPa, respectively. And the glass-ceramics showed better acid resistant than alkali resistant.