关键词: 粉煤灰;锰渣;沸石分子筛;水热合成;钙离子交换

Abstract: Zeolites were synthesized by alkali fusio-hydrothermal synthesis method, which were prepared with manganese slag as raw materials.The influence of calcination temperature, manganese slag mixing amount, n(SiO2)/n(Al2O3), sodu concentration, hydrothermal temperature and time on calcium exchange capacity was investigated.The crystal morphology, skeleton structure and thermostability pore structure of zeolite were characterized by XRD,SEM-EDS,FT-IR and TG-DSC.The results show:when the optimal process condition is calcination temperature 800 ℃, slag mixing amount 40%, n(SiO2)/n (Al2O3)=3.5, sodu concentration 3 mol· L-1, hydrothermal temperature 90 ℃ and hydrothermal temperature 16 h,NaX zeolites with high crystallinity is prepared.The skeleton structure of NaX zeolites does not collapse under 700℃and has good thermal stability,the Ca2+exchange capacity reached 392.58 mgCaCO3/g.

Key words: fly ash;manganese slag;zeolite;hydrothermal synthesis;cation exchange capacity