Method for recovering high-purity sodium bromide from bromine-containing crude salt
US12330955B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2021 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Feb 10, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/0492
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention belongs to the field of bromine recovery from waste circuit board, and particularly relates to a method for recovering high-purity sodium bromide from bromine-containing crude salt. The invention mainly includes the steps of acidification oxidation, multi-stage extraction, and cooperative back extraction. Compared with traditional chlorine oxidation and single urea back extraction technology, the acidification oxidation process can be effectively controlled by reasonable adjustment of the added amount of hydrochloric acid and sodium chlorate, and the tail gas can be absorbed and reused to avoid secondary pollution and resource waste. At the same time, urea is used with sodium carbonate for cooperative back extraction to achieve a high back extraction rate which greatly reduces the amount of urea, and obtains high-purity sodium bromide crystals. The efficient recovery of bromine resources in bromine-containing crude salt is realised. The benefits of the invention are: high product purity, simple operation, environmental friendliness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.