Heavy metals recovery system for dust from NKK electric-resistance furnace

After vitrification of the residues from a municipal solid waste incinerator, the vitrified products can be used as a construction material, and the dust can be used as raw materials for the non-ferrous industry. The NKK electric-resistance furnace is operated under a reducing atmosphere, and heavy metals such as lead and zinc in the ash vaporize to form dust. The concentration of lead and zinc in the dust after washing is sufficiently high for the dust to be used as a raw material for the lead and zinc industry.