Treatment of aqueous phosphorus wastes
US5368741A · kind A · utility
6Cited by
19References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1993 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Oct 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Aqueous phosphorus wastes from the electric furnace production of phosphors and containing heavy metal bearing particulates are treated with lime whereby the phosphorus is converted into useful phosphorus compounds and the heavy metals rendered sufficiently non-leachable to permit their release into the environment. The treatment is conducted above about 60.degree. C. at a pH of between about 11.0 to 12.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.