Fixation of heavy metals, mercury recovery and dioxins destruction in municipal solid waste incinerator ash
US5347073A · kind A · utility
2Cited by
11References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S106/01
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Fly ash generated from incineration of municipal solid waste (MSW) when placed in landfills can under mild acid conditions 1each lead and cadmium. A process for stabilizing lead in this fly ash is presented which involves calcining a mixture of the fly ash and certain calcium-containing compounds in the presence of an oxygen containing gas stream at a temperature greater than about 475.degree. C. and less than about 600.degree. C. for times from about 30 minutes up to about 5 hours. Such treated MSW fly ash will give leachates containing lead concentrations less than the EPA regulatory limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.