Sulfide precipitation of heavy metals from aqueous solutions
US5338460A · kind A · utility
18Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1993 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Apr 22, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process is disclosed for the removal of dissolved heavy metals from aqueous solution contaminated therewith wherein at least one of said heavy metals is reacted with a water-soluble inorganic sulfide or hydrosulfide at a defined elevated temperature and a controlled pH of between about 2 to about 3.5 to thereby precipitate heavy metal sulfide, and thereafter separating the precipitate from the filtrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.