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UTILIZATION OF METAL SUBSTANCE FROM FOUNDRY DUSTS
Abstract
The foundry industry, itself, is one of the wo rldВґs first recyclers. Foundries have been making new metal objects by remelting old ones. An estimated 15 to 20 million tons of scrap metal that would otherwise be sent to overcrowded landfills are being remade into new castings each year. As with most industries, the foundry industry generates its own by-products. Typical by-product streams from the foundry indus try include foundry sand, foundry slag, baghouse dust, and furnace and ladle refractory. In order to control particulate emissi ons from foundry operations, foundries use conventional wet scrubbers and dry baghouse collection systems. Typical foundry operations that require some form of air pol lution control for particulate emissions are melting, pouring, cooling, shakeout, and gri nding and finishing. The nature of the dust collected is a function of the foundry operation that generates the dust. Dust with metal content is generated in furnaces, by finishing operations and by grinding of castings. Cupola or electric arc furnace dust contains iron in the form of oxides, dust from finishing operations and from grinding contains iron in metal form. FeO content in cupola furnace fly dust contains around 20% FeO, iron content in the dust from finishing operation is approximate ly 40% and from castings grinding around 80%. Main goal of this contribu tion is utilization of metal (i ron) from these three kinds of dusts by cast iron castings production.
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References8
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