污泥煤矸石复合制备地质聚合物及其性能研究

Study on Preparation and Properties of Geopolymer with Sludge and Coal Gangue

为丰富地质聚合物的制备原料,并拓宽污泥和煤矸石资源化利用途径,采用热活化污泥与煤矸石在碱性激发的条件下制备地质聚合物,借助X射线衍射、扫描电子显微镜和傅里叶红外光谱分析了地质聚合物试块的宏观、微观性能。结果表明:经900℃焙烧45 min的污泥(粒度<5μm)以40%的掺量取代煤矸石后,制成的地质聚合物抗压强度高达39.8 MPa;热活化后污泥中的有效CaO、MgO和SiO2等成分及碱性物质K2O和Na2O,进一步为地质聚合反应提供了所需的碱性环境,有利于矸石中硅铝相的解聚以及解聚的硅铝配合物的溶出和扩散,能加速地质聚合反应的进行。

In order to enrich the preparation materials of geopolymer, and broaden the utilization way of sludge and coal gangue, the authors used thermally activated sludge and coal gangue to prepare the geopolymer under the condition of alkaline excitation.The XRD, SEM, FTIR were used to analyse the geopolymer＇s macroscopic and microscopic properties. The results showed the compressive strength of the geopolymer could reach 39. 8 MPa,prepared with 40% thermally activated sludge（ 〈5 μm） which was roasted at 900 ℃ for 45 minutes to displace the coal gangue.The effective composition such as CaO, MgO, and SiO2 of thermally activated sludge and the alkaline substances K20 and Na2O could provid further the alkaline environment to promote the polymerization reaction, and it was advantageous to the depoly-merization of aluminum silicon phase in the coal gangue and dissolution and diffusion of depolymerized alumina complexes, therefore, it could improve the speed of polymerization reaction.