Method for removing of multivalent heavy metals from metal plating waste effluents
US4100065A · kind A · utility
9Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1976 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Dec 22, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An exfoliated vermiculite cation-exchange column is used to remove multivalent heavy metals (copper, zinc, nickel, chromium, etc.) from metal plating wastes. The exfoliated vermiculite may be either chemically or relatively low-temperature thermally expanded vermiculite ore. It preferably has a cation exchange capacity of over 80 meq/100g. Exfoliated vermiculite particle sizes of less than approximately 10 mesh are preferred as the column packing. The ion-depleted vermiculite from the exchange column after use can be further expanded thermally and used as a lightweight filling material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.