Method and composition for dissolving deposits of magnetite

Details Method and composition for dissolving deposits of magnetite Method and composition for dissolving deposits of magnetite

1984-12-14

1986-09-09

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 134 2216, 134 2217, 134 2219, 134 26, 134 28, 134 29, 252105, 252135, 252156, 252527, C23G 119, C23G 124

Patent

active

046107282

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.

REFERENCES:
patent: 2257186 (1941-09-01), Orthner et al.
patent: 2488832 (1949-11-01), Rossi
patent: 2802788 (1957-08-01), Flaxman
patent: 2935428 (1960-05-01), Huff
patent: 3081265 (1963-03-01), Burr
patent: 3207694 (1965-09-01), Gogek
patent: 4082683 (1978-04-01), Galesloot

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