Method and composition for dissolving deposits of magnetite
US4610728A · kind A · utility
10Cited by
7References
9Claims
0Family size
Inventors
Key dates
| Filing date | Dec 14, 1984 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Dec 14, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21F9/004
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for dissolving deposits of metal oxides, and preferably iron oxides including magnetite without materially impairing the surface on which the deposits reside, which comprises contacting the solid metal oxide with a liquid medium composition comprising (1) an alkali metal borohydride, (2) a chelating agent which forms a metal complex with the metal oxide, said chelating agent being preferably a dialkali metal salt of a polyalkylene polyamine tetraalkanoic acid. The process is particularly effective for the dissolution of Fe.sub.3 O.sub.4 (magnetite) entrapped in the tube-to-tube sheet crevices of nuclear steam generators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.