Magnetic separation to improve purity of iron oxide pigments
AssigneeBayer Aktiengesellschaft
InventorsPeter Kiemle, Franz Hund, Ingo Pflugmacher, Wolfgang Rambold
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Abstract
A process for increasing the color purity of iron oxide pigment particles admixed with color-modifying impurities and obtained by the Penniman process or the aniline process, comprising introducing the particles into a magnetic field, and removing from the magnetic field two fractions of different magnetizability, the first fraction being iron oxide pigment particles of increased color purity and the second fraction being enriched in impurities.
Claims3
A process for increasing the color purity of iron oxide pigment particles admixed with color-modifying impurities comprising carbon and obtained by the Penniman process or the aniline process, comprising introducing the particles into a magnetic field, and collecting from the magnetic field two separate magnetic iron oxide fractions of different magnetizability, at least one fraction being iron oxide pigment particles of increased color purity.
Dependencies are inferred from the claim text.