粉煤灰-脱硫灰制备免烧种植陶粒的研究

Research on Preparation of Unburned Planting Ceramsite with Fly Ash and Desulfurization Ash

以粉煤灰和脱硫灰为主要原料,通过蒸汽养护制备粉煤灰-脱硫灰免烧种植陶粒。考察了蒸养时间、蒸养温度、n(SiO2)/n(Na2O)、脱硫灰掺量和发泡剂掺量对粉煤灰-脱硫灰免烧种植陶粒性能的影响。利用XRD、SEM和EDS对陶粒的物相组成、微观形貌和微区成分进行了分析。实验结果表明:在蒸养时间8h、蒸养温度80℃、n(SiO2)/n(Na2O)=5.0、脱硫灰掺量5%、发泡剂掺量0.75%时,可制备出筒压强度为3.56MPa、吸水率为19.95%、堆积密度为931kg/m^3的种植陶粒。陶粒表面光滑,外型美观,内部孔隙结构发达,吸水能力较强,富含Si、Ca和S等元素,适合植物生长需要。

Using fly ash and desulfurization ash as the main raw materials,the fly ash-desulfurization ash unburned planting ceramsite is prepared by steam curing process.The effects of steam curing time,steam curing temperature,n(SiO2)/n(Na2O),desulfurization ash content and foaming agent content on the performance of the as prepared planting ceramsite were investigated.The phase composition,microscopic morphology and micro-domain composition of ceramsite were characterized by XRD,SEM and EDS.The results show that:when the steam curing time is 8h,the steam curing temperature is 80℃,n(SiO2)/n(Na2O)=5.0,the desulfurization ash content is 5%,and the foaming agent content is 0.75%,the planting ceramsite can be prepared with cylinder compressive strength of 3.56 MPa,while still maintaining the water absorption rate of 19.95%and the bulk density of 931kg/m^3.The planting ceramsite prepared achieves a smooth surface,beautiful appearance,developed internal pore structure,strong water absorption capacity,and is rich in elements such as Si,Ca and S,which are suitable for plant growth.