Basic Principle of Flotation Machine Operation
招远市金凤黄金选矿设备制造有限公司
The flotation machine is driven by a motor through a V-belt to rotate the impeller, generating centrifugal force to create negative pressure. On one hand, it draws in sufficient air to mix with the slurry; on the other hand, it stirs the slurry and chemicals together, while refining the foam so that minerals adhere to the foam, float to the slurry surface, and form mineralized foam. The height of the gate plate is adjusted to control the liquid level, allowing the useful foam to be scraped out by the scraper.
The flotation machine is driven by a motor through a V-belt to rotate the impeller, generating centrifugal force to create negative pressure. On one hand, it draws in sufficient air to mix with the slurry; on the other hand, it stirs the slurry and reagents together while refining the foam, causing the minerals to adhere to the foam, float to the slurry surface, and form mineralized foam. The height of the regulating gate is adjusted to control the liquid level, allowing the useful foam to be scraped off by the scraper.
After the coal slime and reagents are fully mixed, they are fed into the bottom of the flotation machine tank. When the impeller rotates, negative pressure is formed in the impeller chamber, causing the slurry at the bottom and in the tank to enter the mixing zone through the lower and upper suction ports of the impeller respectively. At the same time, air enters the mixing zone through the air guide sleeve, where slurry, air, and reagents are mixed.
Under the centrifugal force of the impeller, the mixed slurry enters the mineralization zone. Air forms bubbles that are broken down and fully contact the coal particles, forming mineralized bubbles. Under the action of the stator and turbulence plate, these bubbles are evenly distributed across the tank cross-section and move upward into the separation zone, where they accumulate to form a foam layer. This foam is discharged by the foam scraping mechanism, producing clean coal foam.
The sorting rotor ring rotates slowly. When the sorting chamber enters the flotation field area, the feed material is distributed to six sorting points via the slurry distributor. Weakly magnetic mineral particles are attracted to the tooth plate and rotate with the sorting ring. Non-magnetic mineral particles pass through the gaps in the tooth plate under the influence of gravity and slurry flow, discharging into the tailings tank at the bottom of the sorting ring. When the sorting chamber reaches the middling cleaning position, a small amount of wash water is added to wash the included gangue, intergrowths, and slime into the tailings tank (this machine does not have a middling tank), aiming to improve the concentrate quality. When the sorting chamber moves to a position with a very weak magnetic field (concentrate washing zone), pressurized water is sprayed to wash the weakly magnetic mineral particles off the tooth plate into the concentrate tank.
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