ORGANIC REMOVAL AND ITS EFFECT ON PRECIPITATION AND ALUMINA QUALITY

Zijidi, J., Solymar, K. and Fehér, I.

The different processes developed for organic removal are evaluated based on a detailed review of the literature. The bauxite and technology related distribution of the organic compounds in process liquors of different alumina refineries are compared completed by the balance of organics determined in an Hungarian refinery.

The following processes for organic removal are discussed in details: evaporation of the hydrate wash water, wet air oxidation, use of synthetic polymers.

Some laboratory tests related to the effect of the organics, especially humates and oxalate on agglomneration process are reviewed.