摘要
研究了污泥添加不同比例的SiO2,Al2O3,CaCO3和Na2CO3后的烧结体建材性能,并从晶体相反应机理角度讨论了添加剂改变烧结体建材性能的作用机理.结果表明,添加硅、铝能显著提高烧结体的抗压强度,硅是玻璃体成陶组分,对提高烧结体的抗压强度主要发挥物理作用;铝主要与污泥中的磷反应生成类似石英结构的AlPO4高强晶体.添加钠能增加烧结体的熔融液相,降低烧结体的吸水率,但烧结体变脆抗压强度降低.添加钙增大吸水率,降低抗压强度.此外,硅、铝会导致烧结体烧结温度提高,钠则能显著降低烧结温度.
In this study, dried sewage sludge （DSS） blended with SiO2 , Al2O3, CaCO3, and Na2CO3 in different proportions was used to produce sintering materials, and the effect of different additives on the characteristics of aggregate construction was discussed from the mechanism of crystal-phase reaction. The results indicated that the compressive strength of sintered product could be improved significantly by adding SiO2 or Al2O3 · SiO2 was the primary component of ceramic, which played an important role in improving the compressive strength of sintered product. Al2O3 mainly reacted with phosphorus in sewage sludge to form aluminum phosphate （ALPO4） crystals. However, Na2 CO3 addition improved the compressive strength of sintered products though it could increase the melting phase and reduce water absorption. In addition, adding SiO2 or Al2O3 resulted in higher sintering temperatures, but Na2CO3 significantly decrease the sintering temperature.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2008年第6期85-89,共5页
Research of Environmental Sciences
基金
国家“十一五”科技支撑计划项目(2007BAC16B03,2006BAC02A19)
关键词
污泥
烧结
添加剂
建材性能
晶体相
sewage sludge
sintering
additive
construction characteristic
crystal phase
