Slag production from industrial wastes at iron foundries by high temperature melting

摘要

Iron foundries generate 2,256,000 tons of industrial waste every year (1995 estimate). Of this only 1,399,000 tons are used effectively, and the rest are disposed (857,000 tons). This is because minor foundries which make up a great portion of iron foundries in Japan do not separate industrial wastes in collection due to insufficient costs and human resources. Due to the increasing reinforcement of laws and regulations every year, needs to produce slag from industrial wastes by high temperature melting are growing. In this study, we therefore produced slag from industrial wastes by high temperature melting, and investigated the changes of the content elements during the process with the aim of reusing industrial wastes generated in iron foundries. It was found that heavy metals of Zn and Pb evaporated in slag production at high temperature melting of 1773K. Slagged samples were also found to separate into the slag layer and iron layer. Vitrified samples on the other hand crystallized when added with CaO and Al{sub}2O{sub}3.