TREATMENT OF IRON SULPHIDE DEPOSITS

摘要

The present invention relates to a method of treating an aqueous system containing or in contact with metal sulphide scale. The method comprises adding to said system, separately or together, sufficient of a synergistic mixture comprising a THP<+> salt, an aqueous solution of a strong acid (and optionally a source of nitrogen) to provide a solution containing from 0.1 % to 30 % by weight of the THP<+> salt at a pH of less than about 1.0. The scale is contacted with said solution, (thereby dissolving at least part of said scale in said solution) and the dissolved scale is withdrawn from the system.