煤矸石直接烧结法制备微晶玻璃

Preparation of Coal Gangue Glass-ceramics by Direct Sintering

摘要: 以煤矸石为主要原料，CaO为助熔剂，采用直接烧结法制备微晶玻璃。探讨了热处理制度对微晶玻璃物相组成、吸水率、体积密度、线收缩率等物化性能的影响。结果表明：本试验所用煤矸石主要含SiO₂ 40%~50%、Al₂O₃ 25%~40%、Fe₂O₃ 5%~10%，在1 280℃下焙烧60 min，所制备的微晶玻璃主晶相为莫来石。同时，其体积密度和线收缩率最大，分别达2.155 g/cm³和17.911%，吸水率为0.302%。该工艺为煤矸石的资源化利用提供了一种途径。

Abstract: The SiO₂-Al₂O₃-CaO system glass-ceramics were prepared by direct sintering method with coal measure solid waste-coal gangue as the main raw material, supplemented by a certain amount of CaO. The effects of heat treatment on the physical and chemical properties of SiO₂-Al₂O₃-CaO glass-ceramics, such as phase composition, water absorption, bulk density and linear shrinkage, were discussed. The results showed that the main crystalline phase of the gangue glass-ceramics prepared at 1 280℃ for 60 min was mullite. Meanwhile, the bulk density and linear shrinkage were the largest, which were 2.155 g/cm³ and 17.911%, respectively, and the water absorption rate was 0.302%. It provided an effective way for the utilization of coal gangue.