Process for the production of iron oxide yellow pigments

Details Process for the production of iron oxide yellow pigments Process for the production of iron oxide yellow pigments

1990-05-25

1991-07-16

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106456, 423633, C09C 122

Patent

active

050321803

ABSTRACT:
A process for the production of iron oxide yellow pigments by the Penniman-Zoph process from the raw materials iron (II) sulfate, sodium hydroxide and metallic iron, is disclosed in which iron (II) is oxidized to iron (III) by gassing with air in the presence of goethite nuclei, the iron (III) sulfate is dissolved to form iron (II) and the goethite nuclei are built up to iron oxide yellow pigments, characterized in that the gassing with air and dissolving of the metal are carried out in separate vessels.

REFERENCES:
patent: 1327061 (1920-01-01), Penniman
patent: 1368748 (1921-02-01), Penniman
patent: 4221766 (1980-09-01), Pabst

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