以粉煤灰一步酸溶法提取氧化铝剩余的酸溶渣为原料制备具有一定强度的地质聚合物,经过水热反应原位转化NaA分子筛。通过研究合成过程中的硅铝比、碱量、液固比等因素对制备体型化分子筛的影响,得到了制备酸溶渣基地质聚合物原位转化NaA型分子筛的最佳条件：在二氧化硅与三氧化二铝物质的量比为1.8、氧化钠与三氧化二铝物质的量比为1.0、水与酸溶渣质量比为1.2条件下制备出地质聚合物,之后在0.5 mol/L的75 mL氢氧化钠溶液中晶化,在晶化温度为100 ℃、晶化时间为8 h条件下可以制备出晶相单一、结晶度高的NaA体型化分子筛。制备的NaA体型化分子筛具有明显的立方体形貌,颗粒分布均匀,孔径为0.685 nm,比表面积为86.75 m²/g,抗压强度为4.5 MPa。

Geopolymer with a certain strength was prepared by extracting the remaining acid-soluble slag of alumina from fly ash with one-step acid dissolution method,and the NaA Zeolite was converted via in-situ hydrothermal.The effect of various factors,such as ratio of silicon to aluminum,alkali content,liquid-solid ratio etc on the crystallinity of NaA zeolite was inves-tigated.Optimal condition for the synthesis NaA zeolite from acid-soluble residue based geopolymer was determined to be：SiO₂/Al₂O₃ molar ratio of 1.8,Na₂O/Al₂O₃ molar ratio of 1.0,and H₂O/acid-soluble residue mass ratio of 1.2,and then in 0.5 mol/L 75 mL NaOH,the NaA zeolite with single crystal phase and high crystallinity could be prepared by hydrothermal reaction at 100 ℃ and hydrothermal reaction for 8 h.The prepared NaA zeolite had an obvious cubic shape,uniform particle distribution,pore size of 0.685 nm,specific surface area of 86.75 m²/g,and compressive strength of 4.5 MPa.