Thermal regeneration of foundry sand

US9737927B2 · kind B2 · utility

Assignee

• ASK Chemicals GmbH · US

Inventors

• Diether Koch · Mettmann, DE
• Jens Müller · Haan, DE
• Marcus Frohn · Dormagen, DE

Key dates

• Filing date: Feb 19, 2008
• Grant date: Aug 22, 2017
• Expiry date: Dec 22, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C5/085
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method for regenerating used foundry sand, which is contaminated with soluble glass, wherein: used foundry sand is provided, which is tainted with a binding agent made of the soluble glass, to which a particle-shaped metal oxide is added; and the used foundry sand is subjected to a thermal treatment, wherein the foundry sand is heated to a temperature of at least 200° C., thereby obtaining regenerated foundry sand. The invention further relates to regenerated foundry sand, as that obtained from using the method.