How to use inclined plate thickener for tailings dry discharge

 Tailings treatment is an important part of mine production. Concentration in dry tailings discharge is an important link in achieving dry stacking. It not only directly affects the processing capacity of filter equipment, but also affects the resistance of filter cakes. The particle is resistive to the filter cake, so according to the characteristics of iron tailings, there is a new type of thickener.

The flow of tailings slurry in the thickener is ideally slow. As soon as the solid particles leave the flow layer, they will be considered as sediment. This model is also called shallow sedimentation. The sedimentation occurs in the void between the inclined plates. Within the cavity, but due to the small spacing between the inclined plates, it creates favorable conditions for the formation of laminar flow. The clarified overflow water moves upward along the inclined plate space, and the solid particles settle between the two plates, and only need to settle to a small distance to fall on the plate, and then slide down the inclined plate to the compression port for compression and dehydration , The final height will be discharged from the bottom discharge port. According to the difference between the feeding direction and the sedimentation direction of solid particles in the inclined plate thickener, it can be divided into upward flow and downward flow. Three types of lateral flow.

(1) Upward flow means that tailings slurry is fed from the lower part, the sediment is discharged from the lower part, and the overflow is discharged from the upper part;

(2) Downward flow means that tailings slurry is fed from the upper part, the sediment is discharged from the lower part, and the overflow is discharged from the lower part;

(3) Lateral flow means that tailings slurry is fed in from one side, sediments are discharged from the bottom, and overflow is discharged from the other side.

Since the concentration of iron tailings is generally low, the thickener is equivalent to a clarification device. Its sedimentation area can be calculated based on the rising speed of the clarified water in the thickener and the sedimentation speed of the finest particles in the material to be recovered. 

The inclination angle of the inclined plate is also an important concentration parameter. The sum of the area of ​​the thickener is the sum of the horizontal projection area of ​​each layer of the inclined plate. In a certain range, when the inclination angle is less than a range, the relative sedimentation velocity of solid particles will be reduced, and the liquid flow between the inclined plates will be affected. In order to work normally, the solid particles falling on the inclined plates can flow by themselves. The discharge angle cannot be too small. So choose 45 degrees-60 degrees.

The spacing between the plates has a great influence on the concentration effect. When the distance between the plates is small but the production capacity is the same, the size of the thickener will be too small. The distance between the plates is small, and a large number of inclined plates can be accommodated on the same level, which can help increase the sedimentation area of ​​the thickener. However, if the board spacing is too small, the surface of the inclined board will rub against the fixed particles that have fallen on the board from sliding down, and bring certain difficulties to the use and maintenance of the equipment.

The core key to the promotion and application of inclined plate concentration equipment lies in the material selection and production of the inclined plate. The range of material selection is relatively wide, and the best can be selected according to the conditions of use. Board materials with the characteristics of chemical stability, sufficient strength, light weight and cheapness, non-toxicity, smooth surface, good hydrophobicity, antistatic, and aging resistance can all be used.

If the conditions of use allow, the length of the inclined plate is longer to increase the unit footprint of the thickener.

At the same time, in order to ensure that the material can be evenly covered in the width direction and to avoid the deflection and deformation of the board surface in normal work, the width of the board should not be too large, usually no more than 0.8 meters.