MANGANESE REMOVAL IN CLOSED KRAFT MILL BLEACH PLANTS

This paper reports that results of extensive laboratory experiments in vestigating removal of manganese by chelation pretreatment and the red eposition of manganese onto pulp fibers under alkaline conditions. Pre treatment pH was found to be the most important control parameter in r emoving manganese from kraft pulp. The dissolved organic concentration and pulp slurry consistency had the greatest impact on the level of m anganese redeposited onto pulp under alkaline conditions.