Methods of treatment of chromite ore processing residue
US7670576B2 · kind B2 · utility
2Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Sep 7, 2005 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Apr 25, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/913
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite processing wastes with sulfide ion; and, contacting the chromite processing wastes with ferrous sulfide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.