Monitoring Environmental Pollution with Heavy Metals from Settable and Suspended Powders Resulted from Electric Arc Furnaces - Case Study

摘要

In summary, despite continuing efforts to reduce the volume of electric arc furnace dust generated, the total volume of EAF dust generated by steel producers continues to grow. The Electric Arc Furnace (EAF), designed for steelmaking from recycled scrap iron , also co-produces between 15 to 25 kg of dust per ton of steel. Common components include iron and iron oxides, flux, zinc, chromium, nickel oxide and other metals used for alloys. If the dust or sludge contains lead or cadmium, it is listed as a hazardous waste During the process, the fumes are extracted through an aperture in the furnace roof. These are post-combusted, cooled, and cleaned from the transported dust, which is collected in large bag filters. This dust contains hazardous, leachable elements such as zinc, lead or cadmium which require EAF dust to be stored in specific landfills. They are absorbed from the air into the food chain where they can stay for many years in light of significant new data on the potential human health effects. Several processes have been developed to recover the zinc, lead and other heavy metals from EAF dust