碱熔融活化固硫灰制备地聚合物

采用碱熔融活化法，由固硫灰制备地聚合物。在前期开展的单因素实验的基础上，采用正交实验，考察了NaOH和固硫灰的质量比、煅烧温度、煅烧时间3个因素对固硫灰基地聚合物的抗压强度的影响。采用XRD，SEM，IR等手段分析固硫灰碱熔融活化前后的物相、微观形貌以及硅铝化学键的变化。实验结果表明，以在NaOH与固硫灰的质量比为0.60、煅烧温度为550 ℃、煅烧时间为60 min的条件下制备的碱熔融固硫灰为原料，制备的固硫灰基地聚合物的抗压强度为38.00 MPa。表征结果显示：通过碱熔融活化固硫灰制备的地聚合物的XRD谱图中出现了地聚合物的特征衍射峰;碱熔融固硫灰的结构松散，在颗粒表面及内部存在大量孔隙;经碱熔融处理后固硫灰的硅酸盐和铝酸盐发生了解聚。

Preparation of Geopolymer from Circulating Fluidized Bed Combustion Fly Ash by Alkali Melting Activation Process

Geopolymer was prepared from circulating fluidized bed combustion fly ash（CFA） by alkali melting activation process. 3 factors affecting the compressive strength of the geopolymer were studied through orthogonal tests. The change of phase,micro morphology and Si-Al chemical bond of the CFA before and after alkali-melting are analyzed by XRD,SEM and IR. The experimental results show that：Under the conditions of mass ratio of NaOH to CFA 0.60,calcination temperature 550 ℃ and calcination time 60 min,the compressive strength of the prepared geopolymer is 38.00 MPa. The characterization results show that：The characteristic diffraction peaks are found in the XRD pattern of the geopolymer;The alkali-melting activated CFA has a loose structure and there are a large number of pores on the surface and inside of its granules;After treated by alkali melting,silicate and aluminate in the CFA are depolymerized.