Contaminated metallic scrap, melting

Contaminated Scrap Contaminated, empty drums were shredded using a transportable metal shredder, packaged in cardboard boxes and fed into the incinerator via the solids feed system. The clean metal recovered from the ash discharge system was sold to a foundry and melted down into recyclable metal feedstock. Most of the scrap metal processing occurred during the warmer months. 

Because of their metallic housings, sources can get mixed in with scrap metal and pass undetected into scrap metal recycling facilities. If melted in a mill, they can contaminate die entire batch of metal and die larger facility, costing millions of dollars in lost productivity and cleanup costs. The scrap industry uses radiation detectors to screen incoming material. However, sources that are under large loads may be undetected initially. 

The post combustion of CO allows (additional) heat recovery from the cupola off-gas. Additionally, it allows the melting of scrap contaminated with oil and grease without additional environmental effects and thus stimulates the recycling of metals. Post combustion without heat recovery shows a negative environmental balance (See cross-media effects). 

Melting contaminated scrap is a challenging task for an air-fuel combustion system. The metals recycling industry (e.g. aluminium, copper, lead) is forced to recycle even highly contaminated scrap to be competitive and protect the environment. 

---