Method for reclaiming lands polluted by hexavalent chromium
US7914232B2 · kind B2 · utility
0Cited by
3References
6Claims
0Family size
Inventor
Key dates
| Filing date | Jul 24, 2007 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | Jun 13, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09C1/002
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A procedure for the on-site reduction to a predetermined level of the concentration of hexavalent chromium in a saturated or unsaturated contaminated area or ground, in which an in-depth treatment of this area or ground is carried out with a predetermined quantity of a gaseous mixture consisting of hydrogen and another inert gas in order to chemically reduce the hexavalent chromium to a state of lower valence, in particular to the state of trivalent chromium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.