Neopolyols suitable for crystal growth modification in the Bayer process

摘要

The invention provides methods and compositions for the addition of a CGM to precipitation liquor of a Bayer process. The CGM comprises a neopolyol, an ester derived from a neopolyol, and/or an ether derived from a neopolyol. Optionally the CGM may comprise water and/or an antifoaming agent and/or a hydrocarbon carrier liquid. The CGM is quite effective and results in a significant increase in mean particle size of produced alumina crystals.

主权项

1. A method of recovering alumina from a precipitation liquor comprising: (i) adding to the precipitation liquor a crystal growth modifying composition, the composition comprising a neopolyol (ii) distributing the crystal growth modifying composition through the precipitation liquor; and (iii) precipitating crystal agglomerates from the liquor.