METHOD AND APPARATUS FOR REGENERATING SAND-CLAY FOUNDARY SANDS

Regeneration of clay-bonded used foundry sand for reuse instead of new sand. A dry mass of used sand is rubbed for such a length of time, is accelerated suddenly and delayed, and is freed continuously of fine components, until the fine matter, active bonding clay and oolitization degree fall below c...

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Bibliographische Detailangaben
Hauptverfasser:	FRANTS KHOFMANN,CH, FRANTS ZATMER,CH
Format:	Patent
Sprache:	eng
Schlagworte:	CASTING CRUSHING, PULVERISING, OR DISINTEGRATING CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL FOUNDRY MOULDING MILLING GRAIN MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POWDER METALLURGY PREPARATORY TREATMENT OF GRAIN FOR MILLING TRANSPORTING
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Beschreibung
Zusammenfassung:	Regeneration of clay-bonded used foundry sand for reuse instead of new sand. A dry mass of used sand is rubbed for such a length of time, is accelerated suddenly and delayed, and is freed continuously of fine components, until the fine matter, active bonding clay and oolitization degree fall below certain threshold values such that the regenerated product substantially gains the characteristics of new sand. An apparatus for regeneration treatment contains a horizontal revolving sand drum (10), an impact rotor (30) disposed inside said drum in the area of the fall stream (46) of the used sand and a pneumatic dust removal device (36) disposed in the inside of the drum. A chemical secondary treatment of the regenerated product can be carried out advantageously in the same installation in order to bind remaining fine matter to the surface of the grains of sand and simultaneously to seal the pores of the grains.