WEEE-concentrate contains organic components, that can’t be efficiently separated via mechanical treatment. These substances are thermally decomposed in the smelting furnace and therefore an autothermic smelting process is performed (i.e. without additional fuel). Furthermore, the utilization of the excess heat is advantageous and can be realized by a waste heat boiler. Because of this process, the waste heat can be used to generate electricity, process steam, or even district heating. Depending on the proportion of organic components in the raw material, even a considerable overproduction can occur.