A technology of sands with water glass hardened by liquid esters is a
cheap and ecologic method of producing moulding sands. Due
to these advantages, this technology is still very important in several
foundry plants for production of heavy iron and steel castings.
Reclamation of the mixed moulding and core sands generates significant amounts
of dusts, which require further treatments for their reuse. The results
of investigations of a pressureless granulation of dusts generated in
the dry mechanical reclamation process of the mixture consisting in app.
90 % of moulding sands from the Floster S technology and in 10 % of core
sands with phenolic resin resol type, are presented in the hereby paper.
Investigations were aimed at obtaining granulates of the determined
dimensional and strength parameters. Granules were formed from the
mixture of dusts consisting of 75 mass% of dusts after the reclamation
of sands mixture and of 25 mass% of dusts from bentonite sands
processing plant. Wetted dusts from bentonite sands were used as a
binding agent allowing the granulation of after reclamation dusts
originated from the mixed sands technology.