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5 Aspects Affecting the Inflation of Flotation Cell

Xinhai 2020-02-11(07:02:56) 336 0

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Flotation cell is the main equipment to realize mineral flotation operation in the plant. In the process of froth flotation, the inflation of flotation cell is the key to directly affect the flotation indicator and effect of the flotation machine, factors affecting the flotation machine inflatable amount is various. So what are they? let's have a look.

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Pulp Mass Fraction

Flotation cell pulp mass fraction generally has two forms: one is solid-liquid ratio, which represents the ratio of liquid to solid mass in the pulp, the other is the percentage of solid content, which represents the percentage of solid mass in the pulp.

The mass fraction of pulp in flotation machine has great influence on its filling capacity and dispersion degree. Under normal circumstances, when the slurry mass fraction increases within a certain limit, the degree of filling and dispersion will also increase, and vice versa.

Solution 

To maintain the value of the conventional mass fraction, should not be too large or too small, otherwise the flotation cell is difficult to normal inflation in the pulp, and then reduce the recovery grade.

Rotor Stator Clearance

In the rotor stator assembly of flotation machine, the rotor rotates to force the slurry to be fully mixed with the reagent. Stator is very porous, is the flotation machine rotor slurry channel, in the flotation machine operation process, keep motionless, can be used to stabilize the flotation tank foam, prevent the slurry on the foam layer, can make the rotor vortex away from the foam to form a stable slurry surface.

If the rotor stator clearance is too large, the slurry will flip from the front of the rotor to the rear of the rotor, resulting in the reduction of the vacuum in the rear of the rotor, resulting in the decrease of the charging volume. If the gap is too small, the rotor and stator of the flotation machine are easy to collide with each other and produce friction, resulting in a smaller charge.

Solution

In order to ensure that the flotation machine stator rotor does not affect the flotation machine charging capacity, it is better to control the gap between the flotation cell rotor stator at 6-8mm.

Distance Between Rotor and Slurry Level

During the operation of the rotor of the flotation cell, keeping a certain distance from the grout level is an effective condition to ensure the flotation efficiency of the flotation machine. When the rotor is further away from the grout level, the greater the static pressure acting on the rotor, the greater the rotary resistance of the rotor, resulting in the decrease of the flotation machine's filling capacity, and vice versa.

Solution

The flotation machine can be added to the automatic level adjustment device, xinhai mining assembly in the flotation machine design fully considered the impact of rotor depth on the filling capacity, so the design of a reasonable rotor depth, and equipped with automatic level adjustment device.

Feed Amount

Flotation cell in a certain range, when the amount of slurry is larger, the slurry is thrown out of the centrifugal force is also large, the vacuum formed in the negative pressure area is higher, so that the volume of its charging increase, if the slurry is too large, it will lead to the air cylinder above the impeller blockage, in the suction difficult, this is the volume of charging is reduced.

Solution

In the flotation process should be in strict accordance with the provisions of the slurry, then into the impeller center of the slurry is more appropriate, the amount of gas is also relatively large.

Speed of Impeller

During the froth flotation process, the higher the speed of the impeller of the flotation machine is, the higher the charging capacity will be. However, if the speed is too large, the blade will not be damaged quickly on the cover plate, resulting in unstable pulp page and increased power consumption.

Solution

The flotation cell in the normal operation state, should ensure that the impeller stirring speed is greater than the required critical speed of solid suspension; The impeller stirring speed should be higher than the required speed of disperse gas.

Generally, the speed of the surrounding line of the impeller of the flotation machine reaches 7~10m/s as the reference counter speed, and the flotation machine of 1000ml/1500ml generally has a speed of 1500 RPM, which is considered as the normal speed.

Conclusion

The above content analyzes the Influence factor of inflation of flotation cell  from 5 aspects. During the actual operation of the flotation machine,s in order to ensure the appropriate flotation charging volume, it is necessary to increase the monitoring and control of the above problems. It is recommended that consult a qualified flotation machine manufacturer to purchase equipment and choose the appropriate flotation machine according to the actual situation to obtain better flotation index.


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