Process for reducing the cyanide content of a solution
US5120451A · kind A · utility
3Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/903
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for treatment of waste aqueous process streams from industrial process containing both cyanide ions and dissolved ammonia to reduce the cyanide content, comprising the consecutive steps: (a) adding a halogenating agent to the solution while maintaining the pH of the solution at greater then 7; (b) removing ammonia from the solution by aeration; (c) acidifying the solution to a pH of less then 7; (d) substantially neutralizing the solution; and (e) removing the ammonia from the solution by aeration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.