Process for deactivating soluble metal cations in iron oxide...

Details Process for deactivating soluble metal cations in iron oxide... Process for deactivating soluble metal cations in iron oxide...

C - Chemistry, Metallurgy

01

G

6/210, 23/267, 9

C01G 49/06 (2006.01) A23L 1/275 (2006.01) C09C 1/24 (2006.01)

Patent

CA 1192724

Abstract of the Disclosure The subject matter of this invention relates to a process for deactivating the soluble metal cations contained in iron oxide pigments comprising A. adding, while oxidizing, an alkalizing compound to an iron oxide pigment, a slurry until the pH of the pigment slurry is greater than 9; and B. separating the iron oxide pigment from the liquid phase of the slurry. The pigments can be used as colorants for substances ingested by man and animals, and they can also be used to stabilize plastics against ultraviolet degradation.

392864

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