Process to remove organic impurities from bayer process liquor using ozone
OwnerRudolf Jennyinventor
Life of this patent
Estimating the term…
Abstract
A process for transforming organic carbon into removable carbonate and oxalate in Bayer process liquor, including decoloration is provided involving the steps of contacting an ozone-oxygen mixture with a Bayer process liquor, reducing the foam formed by the Bayer process liquor, controlling the temperature of the Bayer process liquor, and eliminating excess ozone in the offgas of the ozonation step, thereby reducing organic impurities in the Bayer process liquor.
Claims19
A process for transforming organic carbon into removable carbonate and/or oxalate in Bayer process liquor comprising:
- controlling the temperature and viscosity of said Bayer process liquor within selected ranges,
- substantially reducing foam formed by said Bayer process liquor and causing said transfer by contacting an ozone-oxygen mixture with the Bayer process liquor, and
- substantially eliminating excess ozone in offgas produced by the Bayer process liquor.
A process for decoloring Bayer process liquor comprising:
- controlling the temperature and viscosity of said Bayer process liquor within selected ranges;
- transforming color containing organic carbon in the Bayer liquor into colorless carbonate and/or oxalate by contacting an ozone-oxygen mixture with the Bayer process liquor;
- and
- substantially eliminating excess ozone in offgas produced by the Bayer process liquor.
A process for enhancing efficiency of removing alumina hydrate from Bayer process liquor comprising:
- controlling the temperature and viscosity of said Bayer process liquor within selected ranges;
- increasing the solubility of the alumina hydrate by reducing the amount of organic carbon in the Bayer process liquor;
- and
- precipitating increased quantities of alumina hydrate by cooling the Bayer process liquor.
Dependencies are inferred from the claim text.