Self aspirated flotation machines have historically been favored in low technology processing plants, as air addition is one less variable that must be controlled. However with most modern plants having computer based control systems, the ability to accurately control the air addition rate in to the flotation cell gives the operator a
Modern simple plants, which gravity feed flotation concentrate directly from the flotation cell launder onto filters, usually do not provide sufficient shear for floc mixing, or residence time for floc formation. This is believed to lead to over flocculation. 13.3.2 Fractional dewatering approach and coarse addition
flotation circuit. Flotation cells have three main control parameters reagent dosing rate froth depth and air addition rate. Many other parameters may vary such as feed rate, particle size distribution and head grade, however these are the output of upstream processes and are not controlled in the flotation circuit itself.
Figure 5 Typical tank designs in mechanical flotation cells. Figure 6 Schematic of a mechanical cell showing feed box and discharge box and concentrate launders. with a rectangular opening at the bottom of the box to allow entry of slurry into the cell bank for Sotation. The feed box is rectangular or half
Feed slurry was mixed with entrained air in an agitation box and flowed into the separation vessel where froth was collected as overflow. The design would be the basis for the Minerals Separation Corporation standard machine and early flotation cells used in the United States .