关键词: 微晶玻璃, 氧化锌, 重金属锌, 显微结构, 固化机制, 尖晶石

Abstract: Using analytical pure reagents as raw materials to simulate zinc-containing smelting slag, glass-ceramics were prepared by melting method. X-ray diffraction, scanning electron microscopy, and Raman spectroscopy were used as characterization methods,and the effect of different zinc oxide content on the formation, crystallization, physical and chemical properties of glass-ceramics was explored. The results show that the main crystalline phase of glass-ceramics is cordierite, and the addition of a small amount of zinc oxide (less than 0.5%, mole fraction, same as below) can enhance the glass-forming ability. As the zinc oxide content gradually increases (0.5%~20.0%), the integrity of glass network structure deteriorates, and the viscosity of glass decreases. The main phase of glass-ceramics is transformed from cordierite to spinel, and the crystallinity and grain size of glass-ceramics increase. Consequently, the bulk density, hardness and resistance to acid/alkali corrosion of glass-ceramics also increase. Heavy metal zinc has good curability in glass-ceramics, so the leaching concentration of zinc is much lower than the standard value, and leaching rate tends to be stable. This study provides a reference for the solidification of heavy metals through glass-ceramics.

Key words: glass-ceramics, zinc oxide, heavy metal zinc, microstructure, solidification mechanism, spinel