Patent ID: 6153156
Filing Date: 2000-11-28
Classification: C01G,C01P,C22B,Y02P

Abstract:
A process for providing a leady oxide having reduced levels of metallic impurities which comprises providing leady oxide having PbO and a level of impurities, roasting the leady oxide at a temperature and for a time sufficient to convert a proportion of the PbO to orthorhombic PbO and the remainder to tetragonal PbO, exposing the resulting tetragonal and orthorhombic PbO fractions to particle size reduction such that the particle size of the tetragonal PbO is reduced sufficiently to allow separation from the orthorhombic fractions, separating the tetragonal and orthorhombic PbO fractions, and collecting at least the orthorhombic PbO fraction.