Removal of elements from coal fly ash
US9550084B2 · kind B2 · utility
0Cited by
9References
24Claims
0Family size
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Key dates
| Filing date | May 23, 2013 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Feb 16, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62D2101/43
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for removing elements, including heavy metals, from fly ash and from fly ash resulting from removal of SOx/NOx from flue gas using Na2CO3/NaHCO3/trona, is described. An aqueous suspension of the fly ash and/or a solution of the leachate from the fly ash is treated with dissolved ferrous compounds, such as FeSO4.7H2O and/or FeCl2.4H2O, at a chosen initial acidic pH, and the precipitation of the ferrous ions as the solution basifies sequesters the trace elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.