Moriya Suzuki

Osaka National Research Institute, AIST
(1-8-31, Midorigaoka, Ikeda-shi, Osaka, 563)

Abstract

Fly ashes containing 19wt% chlorides with the waste sands and soda ashes were melted continuously in an electric melting furnace with a capacity of 150kg, which has an exit for molten salt. Consumption of electricity and separation ratios of molten salt and transfer ratios of the harmful heavy metals were measured under fly ash disposal rates of 4.2-25.4kg/h. The wastes containing a lot of chlorides could be melted continuously when the arrival time (Ta) of marker of the tracer test was longer than 0.7hr. In the steady condition of slag melting, the minimum consumption of electricity was 1.7kWh/kg, and the maximum separation ratio of molten salt calculated from the chlorine concentration in the slag was 97%. Transfer ratios of the heavy metals to the molten salt or the melted slag were different according to the kinds of heavy metals.

Key words: fly ash, electric melting furnace, molten salts