Process and apparatus for the 3-stage treatment of solid residues from refuse incineration plants

US5925165A · kind A · utility

Assignees

• Von Roll Umwelttechnik AG · DE
• “Holderbank” Financiere Glarus AG · CH

Inventors

• Karl Heinz Pflugl · Weinböhla, DE
• Norbert Kiethe · Bad Marienberg, DE
• Ernst Hugentobler · Wermatswil, CH
• Hans Ruegg · Wohlen, CH
• Ruedi Frey · Bassersdorf, CH
• Anton Mayer · Niedernhausen, DE
• Theo Rey · Kufstein, AT
• Alfred Edlinger · Baden, CH

Key dates

• Filing date: May 22, 1996
• Grant date: Jul 20, 1999
• Expiry date: May 22, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S75/961
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In a method for processing solid residues from refuse incineration plants the slag is melted and heavy metals from the melt (16) are separated for reutilization. The slag is directly transferred from the refuse incineration plant into a first heating chamber (2) and melted there under oxidizing conditions. The melt (16) produced therefrom is transferred to a second heating chamber (3), in which the heavy metal compounds are reduced to their metallic form. Furthermore, additional finely divided residues, such as fly ash, boiler ash and filter dust, are introduced into the second heating chamber (3) via a hollow graphite electrode (19). The melt (16) is then passed on to a third heating chamber (4), in which the residual readily volatile metals are vaporized and the residual non-volatile metals are sedimented. The essentially heavy-metal-free melt is then cooled to form vitreous granules.