污泥-高钙煤系废物制备地聚合物的技术与性能

鉴于地聚合物是一种低碳排放且能源、资源消耗较少的新型胶凝材料,其制备技术倍受关注。采用热活化污泥和高钙煤系废物制备地聚合物,并与采用高钙粉煤灰和矸石制备地聚合物的反应机制与性能进行了对比分析,确定了制备污泥-高钙煤系废物地聚合物的最佳工艺参数。采用XRD、SEM、TG-DTA及FTIR等对制备的地聚合物的原料组成和性能进行了深入分析。研究表明: 经900℃焙烧45 min掺量为40%(＜50 μm)热活化污泥-煤系废物制备的地聚合物具有较好的抗压强度。无定形地聚合物胶凝包裹在球状粉煤灰颗粒周围,有类沸石矿物生成,Al—O/Si—O对称伸缩峰及Si—O—Si/Si—O—Al弯曲振动峰明显。

Preparation technology and properties of sludge-high calcium coal waste geopolymer

In terms of the geopolymer is a new type of cementitious materials, which has a low carbon emission and a less energy and resource consumption, the preparation technology has attracted much attention.The geopolymer was prepared by the thermal activated sludge and high calcium coal waste, the reaction mechanism and property of this kind of geopolymer were comparative analysed to that of geopolymer which was prepared by high calcium fly ash and gangue, then the optimal technological parameters were determined. Raw material composition and properties of the prepared geopolymer were deeply analysed by XRD, SEM, TG-DTA and FTIR.The results show that the compressive strength of the geopolymer is higher when 40% coal waste is replaced by thermal activated sludge (<50 μm) at 900℃ for 45 min. In complex geopolymeric matrix, amorphous geopolymeric gel covers around the spherical fly ahs granule, similar zeolite mineral forms, and asymmetric stretching Al—O/Si—O bonds and Si—O—Si/Si—O—Al bending band appear obviously.