Method and composition for dissolving deposits of magnetite
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United States of America Patent
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Sep 9, 1986
Issued Date -
N/A
app pub date -
Dec 14, 1984
filing date -
Oct 19, 1982
priority date (Note) -
Expired
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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.
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