Arrangement for dry reconditioning of used foundry sands

US5421462A · kind A · utility

Assignee

• Kunkel-Wagner GmbH & Co. KG · DE

Inventors

• Hermann Hofbauer · Trostberg, DE
• Erich Muller · Zell am Harmersbach, DE
• Erhard Putzig · Hannover, DE
• Ekart Schaarschmidt · Alfeld (Leine), DE

Key dates

• Filing date: Jul 12, 1993
• Grant date: Jun 6, 1995
• Expiry date: Jul 12, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C5/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An arrangement for the dry reconditioning of used foundry sands in which used sand is fluidized with air or an air/gas mixture and flung against a precipitator to separate and remove substances covering sand particles. The precipitator has several planar baffle elements arranged in concentric circles around a conical deflector. A jet of used sand/air directed toward the deflector expands radially outwardly toward the baffle elements so that the jet is decelerated several times by the deflector and the baffle elements and, in a confined space, split into individual streams and swirled to provide heavy mechanical friction between sand particles and between sand particles and the baffle elements.