Foundry Wastes Reuse and Recycling in Concrete Production
Titel:
Foundry Wastes Reuse and Recycling in Concrete Production
Auteur:
Silvia Fiore Maria Chiara Zanetti
Verschenen in:
American journal of environmental sciences
Paginering:
Jaargang 3 (2007) nr. 3 pagina's 135-142
Jaar:
2007
Inhoud:
The industrial process of a cast iron foundry plant located in the North of Italy was analyzedin order to determine the amount and kind of produced wastes. The main fractions are core andmoulding sands, muds and powders from dust abatement plants, furnace and ladle slags, and exhaustlime, making about 750-800 t/d of residues for a production of about 800 t/d of globular and grey castiron. All wastes were sampled and characterized by means of particle-size distribution and chemicalanalyses to evaluate the best reuse and recycling solutions. On the grounds of the gathered results, theresidues may be divided in three categories according to the particle-size dimensions: below 0.1 mm,between 0.1 and 0.6 mm and above 0.6 mm. The fraction above 0.6 mm, mainly made of metallic iron,may be reused in the furnaces. The fraction between 0.1 mm and 0.6 mm may be reused in coresproduction, after a regeneration treatment. The fraction between 0.1 and 0.025 mm may be recycled asraw material for the concrete industry, and the below 0.025 mm fraction may be reused in greenmoulding operations. An economic evaluation of the proposed reuse and recycling solutions wasperformed.
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