Scholarly record

DUSTY WASTES FROM THE PREPARATION OF MOULDING MIXTURES AND THE PRODUCTION OF MOULDS

Alena Pribulová, Peter Futáš, Jozef Petrík, Peter Blaško, Marcela Pokusová, Marcela Pokusova

Abstract

Particulate pollutants are generated at all stages of the preparation of the moulding and core mixture, during the handling of raw materials, during mixing and preparation of the moulding mixture in the mixers, during the moulding process itself, and during both manual and machine moulding. The reason for the generation of a relatively large amount of dust in all the operations associated with the manufacture of moulds and cores is the moulding mixture used, the basis of which is abrasive, i.e. sand, whether quartz or of a different chemical composition, e.g. chromium. The moulding compounding workplace is one of the high dust locations. The amount of dust generated depends on the equipment used as well as the type of binder system in the moulding mixture.The actual processing of the moulding mixture generates a relatively large amount of dust, especially during the transport of the material and during the various sieving operations. The experiments used dust from the moulding of castings cast in bentonite moulds, which contained 55.62% SiO2 and was collected on filters. This dust was added to the new moulding mixture, to the moulding mixute that was already circulating under semi-operating conditions in the experimental foundry at the Faculty of materials, metallurgy and recycling and to the moulding mix that was circulating in the foundry. The effect of the amount of moulding dust on the properties of the three aforementioned moulding mixtures was investigated. The results showed that the amount of dust in the moulding mixture (in the foundry) up to 4% did not have a negative effect on the quality of the castings.

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