Process for the utilization of used DeNOx catalysts

US5120690A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Jurgen Jung · Neunkirchen, DE
• Helmut Kretschmer · Waldaschaff, DE
• Rolf Muller · Karben, DE

Key dates

• Filing date: Apr 25, 1991
• Grant date: Jun 9, 1992
• Expiry date: Apr 25, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For a complete utilization of used DeNOx catalysts contaminated with fly ash, the catalyst is crushed to a particle size of usually less than 500 microns, admixed with the ash of a molten ash firing chamber of a coal power plant at weight ratio of usually at least 9 parts molten ash to 1 part catalyst where the catalyst is dissolved in the molten ash at a temperature generally above 1460.degree. C. The resulting molten ash chamber granulated material can be utilized in the usual way, for example in the construction industry, since no pollutants, especially no compounds of tungsten, molybdenum, vanadium and arsenic are eluted into the environment.