Solder skimmings recovery process
US4108635A · kind A · utility
2Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Mar 26, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B13/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improvement in the method for recovering marketable values of solder, lead, and a zinc chloride-ammonium chloride solution from solder skimmings which comprises grinding the skimmings, water leaching the skimmings to dissolve the zinc chloride and ammonium chloride, screening the leach residue to recover solder from the leach slurry, separating the ammonium and zinc chloride solutions from the lead chloride in the leach slurry, and contacting the lead chloride with an alkaline flux, a reductant, and an oxygen-containing gas under heat to recover lead from the lead chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.