Method and apparatus for decomposing organic solutions composed of chelating solutions and/or organic acids containing radioactive metal ions and collection method and apparatus using the same
US5613239A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 19, 1995 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/006
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A solution composed of a chelating solution and/or an organic acid is applied to radioactive metals to form a radioactive metal solution. The metal solution is increased in its electrical conductivity by addition of an alkaline agent, followed by electrolysis by an electrolyzer to thereby convert metal ions in the metal solution to hydroxides of low solubility and to separate the hydroxides as a filter cake by subsequent filtration. The filtrate is irradiated with ultraviolet rays for further decomposition of remaining organic matter and then filtered by a device using reverse osmosis. The resultant filtrate is recycled as clean water for use for a chelating solution and electrolytic solution, or is discharged. The metal ions precipitated by treatment with the alkaline agent prior to electrolysis as matter of low solubility is separated from the filtrate which is thereafter electrolyzed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.