Impacts on the separation of heavy metals in municipal solid waste (MSW)incineration fly ash melting process
垃圾焚烧飞灰熔融过程中重金属分离效果影响因素研究

Melting experiments were carried out to investigate the impacts on the separation of heavy metals in melting process for MSWI fly ash, which was sampled from Tongxing MSW incineration plant in Chongqing. The impact parameters included heating temperature, heating time and basicity. The results indicated that the evaporation of heavy metals had an obvious distribution along with their different melting and boiling point. The evaporation rate of Pb, Zn and Cd is separately high to about 80%,60% and 95%, while the evaporation rate of Cr and Mn are both below 10%. And the evaporation of Pb, Zn,Cd, Mn and Cr has a very weak change along with the variation of heating temperature, heating time and bisicity. The melting process with iron-bath can increase the evaporation of Zn, Pb and Hg, and promote the distribution ratio of Cr and Cu in iron phase. The leaching toxicity of molten slag were tested, and the leaching toxicity of all the metals can reach the standard.