METHOD OF TREATMENT OF LIQUID OR SUSPENSION WASTE CONTAINING IRON, RESULTING CHEMICAL COMPOSITION AND ITS USES AS PIGMENTS AND LOADS IN POLYMER MATERIALS.

摘要

Method of treatment of liquid or suspension residues containing iron, resulting chemical composition and its uses as pigments and fillers in polymeric materials. The method for the treatment of liquid or suspension residues, especially for those residues from the galvanizing industry, is characterized in that it comprises the steps of: a) adjusting the pH of the solution or suspension to a pH of 2 to 7; b) adding or generating in situ a salt of hexacyanoferrate (III) [Fe (CN) {sub, 6} {sup, 3-}] to the solution or suspension, and c) separating the precipitate formed from the solution or suspension. The chemical compositions that are obtained from such treatment have utility as a load of plastic polymeric materials in drawing, injection, casting, or extrusion processes, as well as in the manufacture of resins, enamels, etc. and in finishing coatings of type "duplex" on a metallic or galvanized surface.