DIGESTION OF BAUXITE AND CONVERSION OF BOETHITE INTO HEMATITE AND RECRYSTALLISATION THEREOF IN THE BAYER PROCESS

摘要

An improved process for accelerating the digestion process in the Bayer alumina process is provided which promotes both the goethite-hematite conversion and a more perfect and quick dissolution of the diaspore. The above is achieved by carrying out the digestion in the process of 5-20% by weight calculated on the dry weight of the bauxite of a novel hydrogarnet catalyst.