Reclamation of molybdenum or other heavy metals from wastewater treatment skimmings
US4222872A · kind A · utility
5Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1979 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Feb 27, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Molybdenum or other heavy metal anions and ferric sulfate are reclaimed from wastewater skimmings, that result from treatment of wastewaters through formation of insoluble heavy metal ferric salts and flotation, by treating the skimmings with aqueous caustic at 150.degree.-225.degree. F. to form a solution of the heavy metal anions and a residual solids fraction, separating the solids and contacting the residual solids with sulfuric acid to produce ferric sulfate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.