Process for the treatment of high level nuclear wastes
US4329248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Feb 26, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F9/162
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A process for immobilizing high level waste (HLW) sludge containing aluminium and/or iron compounds which comprises the steps of: PA0 (1) mixing the sludge with a mixture of oxides, the oxides in said mixture and the relative proportions thereof being selected so as to form a mixture when heated at temperatures between 800.degree. and 1400.degree. C. crystallizes to produce a mineral assemblage containing (i) crystals capable of providing lattice sites in which the fission product and actinide elements of said HLW sludge are securely bound, and (ii) crystals of at least one inert phase containing excess aluminium and/or iron, said crystals belonging to or possessing crystal structures closely related to crystals belonging to mineral classes which are resistant to leaching and alteration in appropriate geologic environments; and PA0 (2) heating and then cooling said mixture under reducing conditions so as to cause crystallization of the mixture to a mineral assemblage having the fission product and actinide elements of said HLW sludge incorporated as solid solutions within the crystals thereof, and the excess aluminium and/or iron crystallized in at least one inert phase. A mineral …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.