Thermal reclamation of the used moulding sands

The paper presents the results of the research on the used moulding sands subjected to mechanical and thermal reclamation at different stages of the process in the foundry. The research on thermal treatment was carried out in an experimental thermal reclamation appliance. The effects of the process were evaluated with the use of a range of criteria, e.g. loss in roasting, sieve analysis, strength, the acidic reaction (pH). The performed investigations indicate that the thermal reclamation, of spent moulding sands knocked-out from the mould supplying reclaimed materials of the proper quality, can fully substitute the mechanical reclamation