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采用水热方法对城市废物焚化灰进行了固化。该方法为首先将废物焚化灰在5～ 20MPa的压力下压制成块,然后在高压釜中于150～250℃的温度下水热得理10～72h。实验 结果表明:NaOH浓度和添加水泥量对固化材料的拉伸强度影响很大;高压釜的处理温度对 试样的机械性能也起到了很大的促进作用。然而,过热的处理温度却导致了固休材料拉抻强 度的下降。研究还表明,材料的强度主要取决于雪硅钙石的形成。通过对固化体中重金属溶 出量的测试,发现其溶出量低于日本环境标准,这表明水热处理方法在城市废物焚化灰的循环 或再利用方面具有非常好的潜在应用影响。
Municipal solid waste incineration ash is cured by hydrothermal methods. The method comprises the following steps: firstly, the waste incineration ash is pressed into pieces under the pressure of 5-20 MPa, and then hydrothermally treated in an autoclave at a temperature of 150-250 DEG C for 10-72 hours. The experimental results show that the NaOH concentration and the amount of cement added have a great influence on the tensile strength of the cured material. The autoclave treatment temperature also plays a significant role in the mechanical properties of the sample. However, the overheated treatment temperature led to a decrease in the tensile strength of the solid-state material. The study also shows that the strength of the material depends mainly on the formation of tobermorite. The dissolution of heavy metals in solidified bodies was found to be lower than Japanese environmental standards, indicating that hydrothermal treatment methods have very good potential applications in the recycling or reuse of municipal waste incineration ash.