Process for the removal of metals from waters containing them
US4746442A · kind A · utility
16Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
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 metals from waters containing them, comprising the treatment of the waters with an aqueous solution of alkaline salts of humic acids, which is characterized in that said solution is obtained by the dry oxidation of coal by oxygen or mixtures of oxygen and nitrogen, in particular air, and the subsequent extraction of the raw oxidation product by an alkaline solution, and that said aqueous solution is added to into the waters as such, wherein the humic acids salts perform a flocculating action, with the end pH being preliminarily to a value comprised within the range of from 1.5 to 5.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.