Process for producing zeolite adsorbent and process for treating radioactive liquid waste with the zeolite adsorbent
US4448711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1980 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Dec 4, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/186
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Zeolite is contacted with an aqueous solution containing at least one of copper, nickel, cobalt, manganese and zinc salts, preferably copper and nickel salts, particularly preferably copper salt, in such a form as sulfate, nitrate, or chloride, thereby adsorbing the metal on the zeolite in its pores by ion exchange, then the zeolite is treated with a water-soluble ferrocyanide compound, for example, potassium ferrocyanide, thereby forming metal ferrocyanide on the zeolite in its pores. Then, the zeolite is subjected to ageing treatment, thereby producing a zeolite adsorbent impregnated with metal ferrocyanide in the pores of zeolite. The adsorbent can selectively recover cesium with a high percent cesium removal from a radioactive liquid waste containing at least radioactive cesium, for example, a radioactive liquid waste containing cesium and such coexisting ions as sodium, magnesium, calcium and carbonate ions at the same time at a high concentration. The zeolite adsorbent has a stable adsorbability for a prolonged time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.