Industrial Treatment Processes For
The Recycling Of Green Foundry Sands
Author(s)
S. Fiore & M. C. Zanetti
Abstract
Three treatment processes for the reclamation of green moulding sands coming
out from a cast iron foundry located in Northern Italy are considered in this
study. A wet mechanical treatment, a dry mechanical treatment and a dry
mechanical plus thermal treatment are compared to evaluate the efficiency of
each process and to point out the best regeneration solution for the recycling of
reclaimed sand in foundry operations. The inflow and the outflow samples of
each process were characterized by means of particle-size analysis and the
determination of silica, loss on ignition, acid request, oolitic and some metals
contents.
A final evaluation of the three processes was performed taking into account
the obtained quality of recovered silica sand and the economical aspects; the wet
mechanical and the dry mechanical plus thermal treatments are the most
effective for the recovery of green moulding sands coming out from Teksid
foundry plant for cold-box core production.
Keywords: bentonite bonded moulding sand, green sand, foundry waste
recycling.
1 Introduction
Exhaust sands represent a crucial issue in the management of foundry wastes: a
ferrous foundry of secondary fusion produces an amount of wastes varying from
25% to 100% b.w. respect to the final product, and the 30-60% of these wastes is
made of core and moulding sands (EPA [1]). Therefore the optimization of
processes aimed to the recycling of exhaust foundry sands is particularly
interesting.
Keywords
bentonite bonded moulding sand, green sand, foundry waste
recycling.
Related Book
Other papers in this volume
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