Process for thermally separating organic and/or inorganic substances from contaminated material

US5456881A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Gebhard Bandel · Frankfurt am Main, DE
• Stephan Becker · Biebertal, DE
• Dirk Hankel · Mühlheim, DE
• Gurudas Samant · Fronhausen, DE
• Erhard Weilandt · Friedrichsdorf, DE
• Johann Renner · Leverkusen, DE

Key dates

• Filing date: Feb 10, 1994
• Grant date: Oct 10, 1995
• Expiry date: Feb 10, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B09C1/06
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Organic and/or inorganic substances and water are thermally separated from contaminated materials, solid aggregates, the contaminated material is pretreated and is subsequently heated in a directly or indirectly heated furnace, which includes a rotary kiln, a fluidized bed furnace or a floating zone reactor, and during the heating the material is treated with recycled hot gases or recycled hot steam and with oxidizing agents. The exiting processing gases, which contain water vapor, are dedusted, and 80 to 90% by volume of the water vapor-containing processing gases are recycled to the furnace to act as entraining gas. The remaining water vapor-containing processing gases are condensed, the resulting liquid phase is withdrawn, and pollutants are removed from the withdrawn liquid phase by a wet chemical or physical processing.