MAGNETIC SEPARATION TO IMPROVE PURITY OF IRON OXIDE PIGMENTS

摘要

MAGNETIC SEPARATION TO IMPROVE PURITY OF IRON OXIDE PIGMENTS A process for increasing the color purity of iron oxide pigment particles admixed with colormodifying 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. Le A 20 443