Operating Principle
During the operation of the SF flotation machine, the motor drives the spindle through a triangular belt, rotating the impeller at the bottom. The main feature of this flotation machine is manifested in the impeller. The impeller has a backward-inclined double-sided blade, which provides a double pulp circulation in the trough.
When the impeller rotates, the pulp in the upper and lower impeller cavities generates centrifugal force under the action of the upper and lower blades (i.e., main and auxiliary blades) and is discharged around, so that the upper and lower impeller cavities form a negative pressure area. At the same time, the pulp at the top of the cover is sucked into the upper impeller cavity through the circulating hole on the cover, forming a cycle of the pulp. Meanwhile, the pulp discharged into the lower impeller cavity is greater than the three-phase mixture discharged by the upper blade, so the centrifugal force increases, the velocity decay slows down, and the three-phase mixture discharged by the upper blade creates additional momentum, thereby increasing its centrifugal force, which increases the vacuum in the upper impeller cavity and plays an auxiliary suction role. When the lower blade discharges the pulp around, its lower part is replenished at the center, thus forming the lower pulp cycle. Air is inhaled through the suction pipe and central cylinder into the upper impeller cavity, mixed with the inhaled pulp, forming a large number of fine bubbles. After flow stabilization through the cover, it is evenly dispersed in the trough, forming mineralized bubbles. The mineral bubbles float in the froth layer and are discharged from the scrapers as froth products.