Treatment of metal plating wastes with an unexpanded vermiculite cation exchange column
US4210530A · kind A · utility
19Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1979 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Feb 22, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/904
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Multivalent heavy metal ions are removed from metal plating waste streams by passing them through an unexpanded vermiculite cation exchange column. The column is effective to remove copper, zinc, and nickel ions and mixtures thereof. Where cyanide and cyanide-metal complexes are also present in the plating waste stream, the stream is pretreated to destroy the cyanide and cyanide complexes prior to passage through the ion exchange column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.