초록 ▼

A method of removing ferrocyanide ions from the rinse water of an alkaline cyanide metal plating process which comprises adding a sufficient amount of manganous ions to the rinse water containing ferrocyanide ions to form a water insoluble precipitate of manganous ferrocyanide [Mn2Fe (CN)6]which can

A method of removing ferrocyanide ions from the rinse water of an alkaline cyanide metal plating process which comprises adding a sufficient amount of manganous ions to the rinse water containing ferrocyanide ions to form a water insoluble precipitate of manganous ferrocyanide [Mn2Fe (CN)6]which can be readily separated from the rinse water.

대표청구항 ▼

In an alkaline cyanide metal plating process including plating metal articles, rinsing the improvement comprising the plated articles in water, and subjecting the rinse water to chlorination, the steps of removing ferrocyanide ions present in the rinse water prior to chloriniation by mixing with the

In an alkaline cyanide metal plating process including plating metal articles, rinsing the improvement comprising the plated articles in water, and subjecting the rinse water to chlorination, the steps of removing ferrocyanide ions present in the rinse water prior to chloriniation by mixing with the rinse water maintained at pH values ranging from pH 7 to pH 10 at least one equivalent of soluble manganous salt required to react with the ferrocyanide ions present, thereby forming manganous ferrocyanide [Mn2Fe (CN)6]as a water insoluble precipitate and removing the precipitate from the treated rinse water.