基于响应曲面法的垃圾焚烧灰渣-凝灰岩基地质聚合物制备工艺

Preparation Process of Waste Incineration Ash-tuff Base Geopolymer Based on Response Surface Method

垃圾焚烧灰渣是生活垃圾经高温煅烧后的产物,灰渣的资源化利用已成为当今热点课题之一。采用响应曲面法研究了碱当量、硅钠摩尔比和灰渣掺量对生活垃圾焚烧灰渣-凝灰岩基地质聚合物抗压强度的影响,优化了灰渣-凝灰岩基地质聚合物的制备参数,建立了地质聚合物抗压强度的响应曲面模型。研究结果表明,影响灰渣-凝灰岩基地质聚合物抗压强度的各因素显著程度由大到小依次为:碱当量>灰渣掺量>硅钠摩尔比。灰渣-凝灰岩基地质聚合物的最优制备参数为碱当量9.49%、硅钠摩尔比1.71、灰渣掺量17.85%。最优制备参数下28 d抗压强度预测值为24.18 MPa,试验值为24.77 MPa,试验值与预测值基本一致。研究成果可为垃圾焚烧灰渣-凝灰岩基地质聚合物制备参数及实际应用提供理论参考,并为生活垃圾焚烧灰渣资源化利用提供一条有效可行的途径。

Waste incineration ash is the product of domestic waste after high temperature calcination.The resource utilization of ash has become one of the hot topics today.The effects of alkali equivalent,silicon-sodium molar ratio and ash content on the compressive strength of waste incineration ash-tuff base geopolymer were studied by response surface method.The preparation parameters of waste incineration ash-tuff base geopolymer were optimized,and the response surface model of geopolymer compressive strength was established.The results show that the significant degree of each factor affecting the compressive strength of ash-tuff base geopolymer from large to small is:alkali equivalent>ash content>silicon-sodium molar ratio.The optimal preparation parameters of ash-tuff based geopolymer are alkali equivalent of 9.49%,silicon-sodium molar ratio of 1.71,and ash content of 17.85%.Under the optimal preparation parameters,the predicted value of 28 d compressive strength is 24.18 MPa,and the experimental value is 24.77 MPa.The experimental value is basically consistent with the predicted value.The research results not only provide theoretical reference for the preparation parameters and practical application of ash-tuff base geopolymer,but also provide an effective and feasible way for the resource utilization of waste incineration ash.