PENG Tong-jiang, DING Wen-jin, SUN Hong-juan, CHEN Ji-ming
(Key Laboratory of Solid Waste Treatment and Resource Recycle of Southwest University of Science and Technology,
Ministry of Education, Mianyang 621010, China)

Abstract: Based on the significant effects of heat treatment on crystallization behaviors of glass-ceramics, influences of nucleation temperature and crystallization temperature on crystallization behavior of CaO-MgO-SiO2 glass-ceramics were studied. Heating temperatures for nucleation and crystallization were both determined by using DTA curve of the parent glass. Crystalline phase and microstructure of the glass-ceramics were investigated by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicate that the main crystalline akermanite of the glass-ceramics converted into melilitite and the crystallization ability was improved with increasing nucleation and crystallization temperature, meanwhile, the minor crystalline phase diopside and forsterite were disappeared gradually. The toxic asbestos fibers converted into silicate materials and became harmless for environment after the heat treatment process.

Key words: solid waste; chrysotile asbestos tailing; heat treatment; crystalline phase; crystallization behavior

E-mail: tjpeng@ swust.edu.cn

ACTA MINERALOGICA SINICA Vol. 33, No. 2, 2013, Page 486-492