Metallurgical process for manufacturing electrowinning lead alloy electrodes
US6086691A · kind A · utility
Inventors
Key dates
| Filing date | Aug 3, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Aug 3, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C7/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Lead and lead-alloy anodes for electrowinning metals such as zinc, copper, lead, tin, nickel and manganese from sulfuric acid solutions, whereby the electrodes are processed by a repetitive sequence of cold deformation and recrystallization heat treatment, within specified limits of deformation, temperature and annealing time, to achieve an improved microstructure consisting of a high frequency of special low .SIGMA. CSL grain boundaries (i.e.>50%). The resultant electrodes possess significantly improved resistance to intergranular corrosion, and yield (1) extended service life, (2) the potential for reduction in electrode thickness with a commensurate increase in the number of electrodes per electrowinning cell, and (3) the opportunity to extract higher purity metal product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.