以水玻璃和ZSM-5母液制备的硅胶为硅源、ZSM-5分子筛为晶种，采用水热合成法制备了ZSM-5分子筛。研究了ZSM-5母液制备硅胶的影响因素以及硅胶加入量、Na₂O/SiO₂摩尔比、H₂O/SiO₂摩尔比和晶化温度对ZSM-5分子筛的合成及晶貌的影响。结果表明，利用ZSM-5母液制备的硅胶可以制备出结晶度>95%、比表面积>350 cm²/g、均一、单分布、粒径在1~2 μm之间的ZSM-5分子筛；随着投料碱度的降低或水量的增加，ZSM-5分子筛的晶貌由单晶向孪晶变化；随着晶化温度的升高，晶化时间缩短，晶貌由孪晶向单晶变化，ZSM-5分子筛倾向于团聚生长。利用ZSM-5分子筛制备的丙烯助剂使用性能优异，HZ-14的液化气产率、丙烯产率和液化气中丙烯质量分数分别为24.89%、8.66%和34.8%，说明均一、单分散、晶型为孪晶的ZSM-5分子筛使用性能更加优异。

ZSM-5 molecular sieves are prepared through hydrothermal synthesis method using sodium silicate and silica gel prepared from ZSM-5 mother liquor as the silica source,and ZSM-5 molecular sieves as crystal seeds.The influencing factors for preparation of silica gel from ZSM-5 mother liquor are studied,and the effects of silica gel addition,Na₂O/SiO₂ molar ratio,H₂O/SiO₂ molar ratio and crystallization temperature on the synthesis and crystal morphology of ZSM-5 molecular sieves are investigated.The results show that ZSM-5 molecular sieves prepared by using silica gel from ZSM-5 mother liquor are homogeneous and single distribution,and have a crystallinity more than 95%,a specific surface more than 350 cm²·g^-1,and a particle size between 1-2 μm.The crystal morphology of ZSM-5 molecular sieves changes from single crystal to twin crystal with the decrease of feeding alkalinity or the increase of water quantity.The crystal morphology changes from twin to single crystal,and ZSM-5 molecular sieves tend to grow in agglomerates when the crystallization temperature increases and the crystallization time decreases.The propylene additives prepared by these ZSM-5 molecular sieves have excellent using performance,over which the liquefied gas yield,propylene yield and propylene mass fraction in liquefied gas of HZ-14 are 24.89%,8.66% and 34.8%,respectively,indicating that these ZSM-5 molecular sieves are homogeneous and monodisperse,have a twin crystal form and exhibit better performance.