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Flash smelter
In the flash smelter power and dust is introduced into a stream of plasma heated gas in a vertical reactor where the material smelts.
The material melts and accumulates at the bottom of the reactor and is continuously tapped through a siphon type tapping device. In a hot cyclone remaining slag droplets are separated from the gas.
Energy to the process is supplied by a plasma generator and by partial combustion of coal in the feed material.
By adjustment of the oxygen content in the plasma gas, selective reduction and volatilisation of, for example, zinc and lead can be achieved. The content of these materials in the produced slag can be reduced to very low levels.
The process is especially suitable for melting and vitrification of fly ash from waste incinerators.
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