Method for treating acid mine drainage
US8834725B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2011 |
| Grant date | Sep 16, 2014 |
| Priority date | — |
| Expiry date | Sep 27, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/06
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for treating acid mine drainage containing heavy metals and soluble contaminants is provided. In one embodiment, at least a metal cation is added to the acid mine drainage at a pre-select pH to form insoluble heavy metal complexes. In one embodiment, the metal cation is a trivalent metal ion, e.g., ferric iron such as in ferric sulfate. In another embodiment, a divalent metal ion such as in ferrous sulfate is used. After the removal of the heavy metal complexes, the effluent water is treated with at least a phosphate additive to remove remaining soluble contaminants, thus producing a treated water stream with reduced levels of contaminants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.