污泥焚烧灰固化处理技术研究

研究了硅酸盐水泥、高铝水泥、高岭土和β-萘系减水剂在污泥焚烧灰固化技术中的应用效果。考察了污泥焚烧灰固化块(以下简称固化块)的抗压强度,测定了固化块的重金属浸出毒性,并采用X射线衍射(XRD)和扫描电镜(SEM)分析固化块组成和微观结构。结果表明,4种物质对提高固化块的抗压强度均具有较好的效果,硅酸盐水泥、高铝水泥、高岭土和β-萘系减水剂的适宜掺量分别为10、30、20、1.0g(以100g污泥焚烧灰中掺加的质量计)。XRD和SEM分析结果显示,经固化处理后制得的固化块结构密实,存在石英(SiO2)、水化硅铝酸钙(CaAl2Si2O8)和水化硅酸铝钙(Ca2Al2SiO7)等物质,其中水化硅铝酸钙等凝胶物质有利于提高固化块的抗压强度。

Effect of different concrete admixtures on the solidification of incinerated sludge ash

The effects of four solidifying agents(portland cement,aluminate cement,Kaolin and β-naphthalene superplasticizer) on the solidification of incinerated sludge ash were studied in this paper.The compressive strength and the heavy metals leaching toxicity of obtained incinerated sludge ash solidification blocks was measured,and the composition and microstructure of the solidification blocks was detected by XRD and SEM.The results showed that all the four solidifying agents could improve the compressive strength of the solidification blocks.The optimum mixing amount of portland cement,aluminate cement,Kaolin and β-naphthalene superplasticizer were 10,30,20 and 1.0 g respectively.The XRD and SEM analysis showed that the structure of the solidification blocks was dense;Quartz,CaAl2Si2O8,Ca2Al2SiO7 and other materials could be found in solidification blocks,they were presumed to be beneficial to improve the compressive strength of the solidification blocks.