High-Speed Dispersing Between Two Deinking Loops: Are There Optimisation Possibilities?, 2007 TAPPI 8th Research Forum on Recycling

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Since the end of the 80's, high-speed dispersing has became a basic treatment in multi-loop deinking process and is now included in all modern deinking facilities. Conventionally, this stage is implemented between the 2 deinking loops in order to improve the ink detachment and to reduce the speck contamination. Since the last decade, refining theory has been transferred to high-speed dispersing technology to give more scientific approach to this operation. In the same period and based on CTP pilot plant investigations, a simple and useful method based on fragmentation theory and volume energy approach was developed and is proposed in the present paper. This approach was then used for wood containing grade to determine the incidence of dispersing parameters including consistency, energy application and introduction of peroxide bleaching chemicals on the final properties of the deinked pulps (optical properties as well as morphological fibre characteristics) after post-flotation. Thanks to this new overall approach, a simple optimisation of high-speed dispersing is then proposed allowing to obtain the best deinked pulp properties with the lowest drawbacks associated to a reduced energy consumption.