抄録
Coal ash produced in Japan has been annually increased because of the energy conversion from oil to coal in electric utilities and industries. Coal ash was produced about 7 million tons in 1989 and estimated as much as 14 million tons in 2, 000. It is necessary to decrease a disposal of coal ash and to promote a effective utilization of it.
This paper shows an overview of the productions, origins and natures of coal ash, and some technological developments for effective utilization of coal ash, such as the manufacturing of artificial lightweight aggregates, artificial potash manure and SO2 absorbent made from coal ash and lime, and the recovery of metals from coalash.
