Process for the chemical dissolution of oxide deposits.

摘要

A process for the chemical dissolution of oxide deposits containing a proportion of chromium and in particular for the chemical decontamination of oxide deposits contaminated with activated species (as hereinbefore defined) which process comprises treating the oxide deposit sequentially with
(i) a permanganate salt in acid solution to remove chromium therefrom as hexavalent chromium.
(ii) a reducing agent in acid solution to destroy excess permanganate ions and manganese dioxide formed by reduction of the permanganate; and
(iii) a mixture of a reducing agent and complexing acid to dissolve the residual chromium depleted oxide.