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NEW CLOSURE FOR LEAF FILTERS

Faure, F. Parent, L.

The alumina purification is still produced mainly by the Bayer process as it was many years ago. However it is when looking at each step of the process that the evolution can be observed. Many of the steps have been optimised during last years and now the global productivity of plant has been increased. It is surprising today that the security filtration on leaf filters is one of the steps that remain as it was many years ago. In order to improve the process, a new closing system for leaf filter was developed. This new system was design to reduce leakage in the outlet pipe area, remove the use of a knife during installation and reduce the scale growth. The new closure has been tested in 4 different plants and countries so far. The test results of the new closure in one plant and its impact will be presented.