Abstract
Engineering design for fly ash solidification and stabilization are introduced. In the first case, the engineering design for solidification/stabilization process in China is performed according to the characteristics of original fly ash. The stabilization/solidification process, requirements of the system, technological parameters, equipment, environmental protection, heath, safety and investment estimation of this design, and security landfill for stabilized hazardous wastes are stated in detail. In consideration of the economy and security, solidification with cement and stabilization with chemicals for fly ash is used in most of incineration plants, as landfill became the last procedure. Chemicals like organic chelating agents have proven to be the best choice, with respect to its performance or stability. Hence, organic polymer chelating agent stabilization treatment plus cement solidification process is recommended in real projects. The fly ash, chelating agent and cement are mixed in the mixer, the heavy metals in the fly ash can take complexation reactions with chelating agent and generate insoluble substance to reach stabilization. Parameters details and equipment as well as automatic installations for fly ash stabilization and solidification are listed.
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