Method for cleanly extracting metallic silver
US11566333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2018 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | May 17, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for cleanly extracting metallic silver includes: mixing an acidic solution containing Ce4+ and NO3− with a silver-containing material for leaching; after the leaching is completed, carrying out a solid-liquid separation to obtain a leaching solution containing Ce3+ and Ag+; and electrolyzing the leaching solution, wherein an oxidation reaction of Ce3+ occurs at an anode to realize a regeneration of Ce4+ and an electrolytic reduction occurs at a cathode to reduce Ag+ to obtain the metallic silver. Ce4+ is used as a leaching agent and an intermediate oxidant to implement a cyclic operation of solution leaching and electrolytic regeneration on the silver-containing material. Almost no NOx and waste liquid are caused by the extraction process, and the invention is clean and environmentally friendly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.