VITRIFICATION PROCESS OF POWDER WASTE, PARTICULARLY FLY ASH FROM REFUSE INCINERATING PLANTS

摘要

The dusty waste is vitrified, especially with high content of sulphur compounds, organic matter and heavy metals, in a mixture with meltable additives into the meltable glass batch which is melted in a fully electric furnace. During the vitrification a cold non-molten layer of glass batch is being maintained on the surface of the molten glass, and the sulphur compounds are subjected to reduction to the lowest oxidation stage in a considerably reducing medium by adding the reducing components into the glass batch and/or by the melting temperature in the molten glass at least 1420 DEG C. The molten glass at the bottom of the furnace is immediately before the outlet channel heated by the additional electric heating.