VERFAHREN ZUR FLOTATION VON STÖRSTOFFEN AUS EINER WÄSSRIGEN PAPIERFASERSUSPENSION

摘要

In a process to recycle waste paper, an aqueous suspension (S) of paper and pigment cascades through a series of floatation cells (1-5) forming foam (R1-R5) in each cell, with re-usable fibres advancing to the next cell. Different floatation chemicals are introduced to each cell and their combinations are unique to that cell. Each cell has less impurities in suspension than the previous cell. Foam is generated by admixture of air to the suspension as it cascades from one cell to the next. Foam is skimmed off to a drain. The chemicals are admixed prior to or during the paper break-down process resulting in the aqueous suspension. The impurities removed are printing inks or pigments.