【摘要】 用高硅铝比粉煤灰水热合成Y型、P型和HS型沸石。讨论了碱活化粉煤灰的条件,包括焙烧方法、碱灰比和碱度对合成产物的影响。XRD分析表明:碱活化条件将直接影响沸石的晶型、晶粒尺寸和相对含量。采用620℃低温、两次短时间焙烧工艺明显地改善了活化效果。研究同时发现,低碱灰比和碱度条件下生成P型沸石;高碱灰比和碱度条件下生成HS沸石;Y型沸石的生成条件介于二者之间。合成产物纯度高,结晶好,具有高的阳离子交换容量。更多还原

【Abstract】 Zeolite Y,P and HS were synthesized hydrothermally from fly-ash which has a higher SiO₂/Al₂O₃ ratio.The influence of alkali’s activation conditions,including baking method,alkalinity and NaOH/fly-ash mass ratio on synthetic zeolite was investigated.XRD analysis shows that the type,granularity and relative content of synthetic zeolite were affected by these factors.Baking in a short time twice at 620℃ can improve activation effect.And zeolite P was synthesized in lower alkalinity and NaOH/fly-ash mass ratio condition,while zeolite HS was synthesized in higher alkalinity and NaOH/fly-ash mass ratio condition.The synthetic condition of zeolite Y was between them.The synthetic products have high crystallinity,purity and cation exchange capability.更多还原