FLOTATIONSEINRICHTUNG ZUR STÖRSTOFF-, INSBESONDERE DRUCKFARBENENTFERNUNG AUS ALTPAPIERSUSPENSIONEN

摘要

A flotation device serves to remove ink particles and dirt particles from fibre suspensions which are produced in waste paper recycling. The air admixture is carried out in stage diffusers (5). The suspension mixed with air, prior to entry into the flotation vessel (1), is passed through a deflector part (11) operating as an impact mixer having a subsequent mixing diffuser (12), one flow direction being preferred in the latter. The flotation device according to the invention is particularly suitable for the elimination of interfering substances which are present in a relatively broad spectrum of particle sizes. Particularly favourable embodiments use closed flotation vessels in which the air leaving the foam (9) can advantageously be reused for aeration.