固硫灰制备地聚合物实验研究

Experimental Study on Geopolymer Synthesis from CFBC Fly Ash

以循环流化床燃煤固硫灰为原材料,以水玻璃为碱激发剂成功制备出地聚合物,最高强度为52.8 MPa。最优实验参数为:M=2.5,w水玻璃=33.3%,wMK=20%。XRD、IR、SEM分析表明:固硫灰在反应过程中石英结构遭到破坏,Si-O-Si或Al-O-Si的聚合度降低,产生大量有利于地聚合反应的活性硅氧四面体和铝氧四面体。固硫灰基地聚合物纯度较高,结构致密,且Si-O-Si及Al-O-Si聚合度较高。

Geopolymer were synthesized successfully with the circulating fluidized bed coal solid sulfur ash as raw materials, with sodium silicate as alkali excitation agent. The highest strength was 52.8 MPa. That the modulus of sodium silicate was 2.5, quantity of sodium silicate was 33.3% and content of metakaolinite was 20% were the optimum parameters to prepare CFAs-based geopolymer. The results of mineralogical analysis showed that the crystal of quartz in the CFAs was destroyed and the degree of Si-O- Si or Al-O-Si polymerization was reduced, and a lot of benefit to polymerization of [ SiO4 ]^4- and [ AlO4]^4- was generated. CFAs-based geopolymer has high purity and dense structure which with the higher degree of Si-O-Si or Al-O-Si polymerization