建筑废弃物制备莫来石质材料及其性能研究

Preparation of Mullite from Construction Waste and Study on Its Properties

为实现建筑废弃物的再生循环利用,本研究以建筑废弃物为硅源,以氢氧化铝为铝源,以AlF3为晶须促进剂,制备莫来石质隔热材料。基于建筑废弃物高Si低Al的特征,预先引入Al(OH)_(3)合成莫来石,再根据其相关理化性能,寻找建筑废弃物与Al(OH)_(3)的最佳配比。结果表明,当建筑废弃物与Al(OH)_(3)的质量配比为7:3时于1230℃下煅烧可获得综合性能较佳的试样;试样烧成线收缩率为7.88%,吸水率为13.23%,显气孔率为21.86%,体积密度为1.94 g/cm^(3),抗折强度为31.41 MPa。

In order to realize the recycling and recycling of construction waste,mullite insulation material was prepared with construction waste as silicon source,aluminum hydroxide as aluminum source and AlF3 as whisker accelerator.Based on the high Si and low Al of construction waste,Al(OH)_(3)was introduced in advance to synthesize mullite,and the optimal ratio between construction waste and Al(OH)_(3)was found through its related physicochemical properties.The results show that when the mass ratio of construction waste to Al(OH)_(3)is 7:3,the samples with better comprehensive properties can be obtained by calcination at 1230℃.The sintering line shrinkage,water absorption and apparent porosity of the sample were 7.88%,13.23%,21.86%,1.94 g/cm^(3)and 31.41MPa respectively.