Metsos DR flotation machines are now avail able in capacities up to 42.5 m3 (1500 cubic feet) per single mechanism. Solids suspension In a cell to cell type flotation machine the sanding problem is minimized, as the pulp is 100% mixed in every cell as it passes through the feed pipe and impeller. In a
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High shear will be experienced close to the impeller of a mechanical flotation cell and mostly gravitational force in the collection and cleaning zone of a flotation column. Significant issues of entrainment of fine particles occurs as these particles experience low collision efficiencies as well as sliming and degradation of the particle surfaces.
In normal practice this machine appears as a long tank like vessel having a number of impellers in series. Mechanical machines can have open flow of pulp between the impellers or can be of cell to cell design with weirs between them. Below is a typical bank of flotation cells used in industrial practice.