Treatment of Secondary Fly Ash by Commercial Size MF Furnace System

摘要

Secondary fly ash generated from a municipal waste treatment process is mainly treated by stabilization and land filling. It includes non-ferrous metals, such as zinc and lead. Thus its treatment is important not only because of environmental problems but also for preservation of mineral resources. Melting treatment by the MF process is one of the most promising methods for secondary fly ash in order to recover non-ferrous metals and to prevent environmental problems. A laboratory scale test has already been done and it seems to be an effective method for secondary fly ash. The treatment test by using a commercial size MF process has been studied to determine the feasibility of the MF process in practical use. The test operation was successful without any difficulties or problems. The recovery rates were 90.1 percent and 98.7 percent for zinc and lead, respectively. The slag can be used in the cement industry based on the leaching test of heavy metal elements. Also, the decomposition rate of dioxin was more than 99.8 percent.