Perfected Flotation Cell for Purifying Fibrous Suspensions

A flotation cell for purifying fibrous suspensions through the dispersion of air microbubbles, of the type comprising:

• a container for containing said suspension to be purified;
• one or more feed pipes for conveying said suspension to be purified into said container;
• means for intercepting the purified suspension during its downward flow, under the influence of gravity, towards the bottom of said container;
• means for extracting the purified suspension from said container, associated with said intercepting means;
• means for discharging the foams created by the impurities contained in said suspension caught by said air microbubbles during their upward flow towards the surface of said suspension;
• one or more rotary vanes arranged inside said container for stirring said suspension during the purification process;
• wherein the flotation cell comprises a plurality of air dispersers for generating said air microbubbles and dispersing them in said suspension, each air disperser comprising at least one rotor oriented for creating axial flow through the air disperser and having associated therewith driving means suited to set said rotor rotating, and at least one duct for conveying external air at the level of said rotor.