DOUBLE DIGESTION: TECHNOLOGY THAT LEADS TOWARDS QUALITY AND EFFICIENCY

Doucet, J.

This paper describes, in general terms, the concept behind the countercurrent double digestion as developed and demonstrated by Alcan.

It describes the general operating conditions suggested and stresses the adaptability of the process to bauxites of very different origins.

The presentation will show how the technology allows greater flexibility going at the precipitation circuit and controls the level of impurities such as silica and other oxides.

In summary, the document will demonstrate how improvements in efficiency and quality can be achieved simultaneously.