Treatment of fly ash produced by a waste incinerator and containing chlorides of toxic metals
US5716316A · kind A · utility
15Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | May 9, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S588/90
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
This invention relates to a process for treating fly ash produced by a waste incinerator and containing chlorides of toxic metals, which includes a step consisting of subjecting said fly ash to a phosphating reaction, at high temperature, to convert the chlorides of toxic metals into phosphates, the phosphating reaction being obtained by the addition of a reactant comprising a phosphorus compound, characterised in that said phosphorus compound is a non-metallic compound and in that the chlorinated products obtained are discharged in a gaseous form. It also relates to an installation for implementing this process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.