不同阴离子对固废基铝掺杂托贝莫来石的影响

Effect of Different Anions on Solid Wastes-Based Al-Substituted Tobermorite

以粉煤灰（FA）和城市垃圾焚烧飞灰（MSWI）为主要原料,水热合成了固废基铝掺杂托贝莫来石,研究了不同外源阴离子对试样的抗压强度、反应产物、微观形貌和孔结构的影响。结果表明：外加剂的引入提高了固废基铝掺杂托贝莫来石的抗压强度,对于粉煤灰-水泥-生石灰-脱硫石膏（FA-C-T）体系的增强效果从高到低依次为NaCl、NaOH、NaNO3,粉煤灰-城市垃圾焚烧飞灰-生石灰-脱硫石膏（FA-MSWI-T）体系为NaOH、NaCl、NaNO3;不同阴离子的引入并没有改变铝掺杂托贝莫来石的矿物组成,只是使得各个矿物相的含量有所差异,表明3种阴离子均是络合在铝掺杂托贝莫来石的表面或者存在于层间;不同阴离子的加入使得托贝莫来石的微观形貌发生了改变,也细化了试样的孔结构。

A solid wastes-based Al-substituted tobermorite was prepared with fly ash（FA） and municipal solid waste incineration fly ash（MSWI） as main raw materials. The effect of exogenous anion on the compressive strength, reaction products, micro-structure and pore structure of the samples was investigated. The results indicate that the incorporation of admixtures increases the compressive strength of solid wastes-based Al-substituted tobermorite. For FA-cement-limestone-desulfurized gypsum tobermorite（FA-C-T） and FA-MSWI-limestone-desulfurized gypsum tobermorite（FA-MSWI-T） system, the enhancement order from strong to weak is NaCl, NaOH, NaNO3 and NaOH, NaCl, NaNO3, respectively. The incorporation of anion does not change the mineral composition of solid waste-based Al-substituted tobermorite, however, there are differences among the contents of each mineral phase. It is indicated that the three anions enter the structure of tobermorite due to complexing on the surface or existing between layers. In addition, the introduction of different anions can also change the microstructure of tobermorite, and refine the pore structure.