In order to develop a safe technology for recycling municipal solid waste incineration fly ash (MSWI-FA), the authors have attempted to produce foamed geopolymers with addition of MSWI-FA, and have investigated their various properties, including bulk density, strength, thermal conductivity, and leaching concentration of heavy metals and chlorine, etc. The polymerization reaction products, crystalline compounds and microstructure were also examined through X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) analyses. It was found that it is possible to produce foamed geopolymer with a bulk density of less than 0.5 and a uniform distribution of air voids, by adding metallic aluminum powder as foaming agent and using less than 20% MSWI-FA and suitable alkali activator having low NaOH mole concentration. CaCl(OH)₂ Ca(OH)₂, CaO and KCl, initially included in the MSWI-FA, were not found in the foamed geopolymers. The geopolymers, which used ground granulated blast furnace slag (BFS), coal fly ah and MSWI-FA as precursors, were mainly composed of C-A-S-H gels, incompletely reacted precursors and a small amount of N-A-S-H gels. The foamed geopolymer had very high immobilization capacity of heavy metals (Cd, Cr, Cu, Mn, Pb, Zn), not varying with the pH of leachate. The immobilization efficiency of As changed with the pH of leachate and BFS content. When the BFS content was not less than 60%, the leaching concentrations of all the traced heavy metals including As were low, satisfying the environmental criteria of Japan for recycled construction materials without direct contact with water. The chlorine immobilization capacity of the foamed geopolymers is expected to exceed 70% in long-term age.

为了开发回收城市固体垃圾焚烧飞灰 (MSWI-FA) 的安全技术，作者尝试生产添加 MSWI-FA 的泡沫地质聚合物，并研究了它们的各种性能，包括堆积密度、强度、热电导率、重金属和氯的浸出浓度等。还通过 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分析检查了聚合反应产物、结晶化合物和微观结构。研究发现，通过加入金属铝粉作为发泡剂，并使用小于20%的MSWI-FA和合适的低碱活化剂，可以生产堆积密度小于0.5且气孔分布均匀的泡沫地质聚合物。 NaOH 摩尔浓度。CaCl(OH) ₂Ca(OH) ₂、CaO 和 KCl，最初包含在 MSWI-FA 中，在泡沫地质聚合物中没有发现。以磨碎的高炉矿渣（BFS）、粉煤灰和MSWI-FA为前驱体的地质聚合物主要由CASH凝胶、不完全反应的前驱体和少量NASH凝胶组成。泡沫地质聚合物对重金属（Cd、Cr、Cu、Mn、Pb、Zn）具有非常高的固定能力，不随渗滤液的pH值变化。As的固定效率随浸出液pH值和BFS含量的变化而变化。当BFS含量不低于60%时，包括As在内的所有微量重金属浸出浓度均较低，满足日本不直接与水接触的再生建筑材料环保标准。