Method and apparatus for reclaiming foundry sand

US4491277A · kind A · utility

Assignee

• Klockner-Humboldt-Deutz AG · DE

Inventors

• Hans Bauer · Dana Point, US
• Heinz Schmitz · Bochum, DE

Key dates

• Filing date: Nov 25, 1983
• Grant date: Jan 1, 1985
• Expiry date: Nov 25, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S241/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method and apparatus for reclaiming foundry sand from contaminated foundry sand wherein ferromagnetic contaminants are first removed in a magnetic separating zone, and the remaining contaminated sand is thermally treated at a temperature sufficiently high to cause embrittlement of clay constituents among the remaining contaminants, and finally the thermally treated material is comminuted, preferably in a counterflow impact jet mill to recover a reclaimed foundry sand substantially free from contaminants.