One of the influencing factors of flotation machine - stirring speed

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The flotation machine is one of the important equipment in the flotation operation of the mineral processing plant. It is mainly responsible for completing the flotation of minerals. By adding various chemicals, the three-phase mixing of chemicals, slurry and air is made by stirring. Optional (or non- Selected) minerals attach to the generated bubbles and then float to complete the separation of useful minerals and gangue minerals.

In the flotation process, the key lies in the stirring device. The quality of its stirring effect directly affects the flotation effect. One of the factors that determines the stirring efficiency is: stirring speed. Let's explore the impact of the flotation machine stirring speed on the flotation machine.

1. The role of stirring during flotation machine operation

Slurry flotation is based on the surface of coal and gangue minerals A physical and chemical process of differential sorting of properties. The flotation process can be divided into two stages, namely the slurry mixing stage and the flotation stage.

Slurry mixing stage of flotation machine: Slurry mixing is the basic operation of mineral flotation. In the slurry mixing stage, the slurry and flotation reagents are mixed and contacted through stirring to allow the reagents to adsorb On the surface of mineral particles to enhance hydrophobicity.

Flotation stage of flotation machine: In the flotation stage, the suspended mineral particles collide with the bubbles and adhere to form mineralized bubbles, which rise and float into a foam layer.

The condition for flotation separation is the selective adhesion of the slurry at the interface between the liquid phase and the gas phase. This process depends on the movement characteristics of the flotation machine on the one hand and the interaction between them on the other hand. Displacement speed, collision force between slurry and bubbles, etc.

2. The impact of stirring in the flotation machine

Stirring will mainly affect the uniformity of the aeration of the slurry, the mineralization speed of the bubbles, the shedding of mineral particles on the mineralized bubbles, and the formation of the foam layer of the concentrate. Impact on stability and other aspects. During the slurry flotation process, a higher stirring speed can provide stirring energy with higher shear strength, which can promote the suspension of mineral particles and the even distribution of mineral particles and bubbles in the tank, prevent the stratification and precipitation of coarse particles, and increase the mineral content. It can increase the contact opportunities between particles and bubbles; it can enhance the solubility of air in the high-pressure area in the tank and increase the precipitation of active microbubbles in the low-pressure area; it can promote the dissolution and dispersion of insoluble agents and strengthen the adsorption of agents and mineral particles.

However, the stirring speed should not be too high. Excessive stirring speed will have the following adverse effects:

1. It will promote bubbles Merger reduces the probability of bubble mineralization, affects the selectivity of sorting, and results in poor concentrate quality;

2. It will increase the probability of mineral particles falling off the bubbles, making it difficult to form a stable foam layer;

3. It is easy to over-pulverize and muddy the sorted materials, making it more difficult to sort fine particles;

4. Excessive stirring speed will also cause increased power consumption and damage to various parts of the flotation machine. The loss increases, the service life is reduced, and the flotation production cost is further increased.

3. Requirements for flotation machine stirring

1. At different stages, different stirring speeds have different effects on flotation. The slurry mixing stage requires high rotation speed and high shear to mix the slurry and chemicals, promote the adsorption of the mineral particles to the chemicals, strengthen the bubble mineralization process, and improve the recovery rate of combustibles; the flotation stage should use relatively Low stirring speed is used to reduce the disturbance to the slurry system and is conducive to obtaining a relatively stable foam layer. Using this method, the ash content of clean coal can be reduced as much as possible, the quality of clean coal can be improved, and the degree of flotation perfection can be improved while ensuring the recovery rate of combustibles.

2. In the actual production process, special slurry preparation equipment and other slurry mixing equipment can be set up, a higher slurry mixing speed can be set, and the flotation machine mixing speed can be appropriately reduced to make the mixing The impact of speed on the sorting effect reaches ideal requirements.

Of course, in the actual flotation process, the separation effect of the flotation machine also needs to be adjusted by adjusting the aeration volume, chemical system and other factors. Therefore, it is necessary to determine the appropriate value through flotation test in order to improve the working efficiency of the flotation machine.