Buoyancy movement of air bubbles in a mechanical agitating flotation machine
In the mechanical agitating flotation machine with radiation impeller, the buoyancy movement of the bubble in the square groove can be divided into three different sections according to the groove depth, as shown in Figure 9-3.
The first section is an aerated agitation zone (or a mixing zone). The main function of this area is to mix the slurry with the air, crush and cut the inhaled (or pressed) airflow through the intense stirring, and evenly disperse the bubbles in the tank to avoid the precipitation or stratification of the coarse ore particles, so that the ore particles are effective. Suspended and evenly distributed, increasing the probability of contact and collision of the ore particles with the bubbles.
In the aerated agitation zone, the bubble is easy to violently vortex with the slurry flow from the impeller. At the same time, due to the deep cavity, the static pressure of the slurry is large, and the bubble diameter is small, so the bubble rise and fall speed is extremely slow.
The second zone is a separation zone (or flotation zone). The bubbles move upward with the slurry flow in this section, and the mineral particles adhere to the bubbles to become mineralized bubbles.
In the separation zone, as the depth of the groove decreases, the hydrostatic pressure decreases, the bubble gradually becomes larger, and the vortex motion of the slurry also decreases, and the speed of the mineralization bubble increases.
The third section is a foam zone. A mineralized bubble layer having a certain thickness has been formed on the surface of the ore.
In the mineralized foam zone, due to the accumulation of a large number of mineralized bubbles, the bubbles in the lower layer will continue to rise to the top and will be hindered, so the speed of the lifting will be slower, and the bubbles floating in the upper layer will continue to spontaneously merge to produce "secondary" The rich action causes the mechanically entrained gangue minerals to scatter back to the slurry.
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