Components Removal in Flotation Deinking, 2007 TAPPI 8th Research Forum on Recycling

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In addition to ink removal in flotation deinking, valuable material, such as fibres and minerals, is lost which lowers yield and thus decreases the profitability of the processing. By studying component removal in flotation, a better understanding of the selectivity of the flotation can be gained. In the present study, removal of ink, ash, long and short fibres and fibre fines was studied by calculating their removal efficiencies as a function of yield. Operational parameters, such as rotor speed, soap addition, and flotation consistency were also studied to see their influence on the removal selectivity of each component.

The removal selectivity of ink was very good, and by adding soap just before flotation, the removal selectivity could even be improved. The removal selectivity of ash, long and short fibres and fibre fines were considerably lower than that of ink. The main yield losses were due to ash and partly to fibre fines removal.