The chute beating is a process of selecting and dividing by the method of bevel water flow. The mixture of ore particles is fed into a chute having a small inclination angle, generally 3 to 4 degrees and not more than 6 degrees. The ore particles are stratified by specific gravity under the action of the momentum of the water flow, the gravity and centrifugal force of the ore particles, and the frictional force. Since the velocity distribution of the water flow in the trough is large in the upper layer, the ore particles with a larger specific gravity are concentrated in the lower layer under the lower layer, and are subjected to less water flow force and larger groove bottom friction force, and slowly move forward along the groove bottom, and the specific gravity is small. The ore particles are concentrated in the upper layer and carried by the water stream to flow out of the tank at a faster rate. Then, the two product concentrates and tailings with different specific gravities can be obtained by intercepting the layers separately.
2. What kinds of chutes are there?
There are many types of chutes, which are divided according to the force of the ore particles: gravity chutes and centrifugal chutes; according to the selected particle size: coarse grain chute, fine grain chute.
Therefore, the chutes produced according to the above principle mainly have fan-shaped chutes, centrifugal concentrators (also called horizontal centrifugal chutes), spiral concentrators (also called spiral chutes).
3. What is the working principle of the fan-shaped chute? What type of ore is suitable for handling?
The shape of the sector chute is as shown in FIG. Its ore supply end is wider, and the closer it is to the end of the discharge end, the smaller the cross section.
Its working principle is that when the solid content accounts for 50-60%, the slurry enters the chute from the front end of the slurry and flows to the tipping end of the ore. Since the inclination of the chute is not too large (generally 15-18°), the concentration of the slurry is large, and a very smooth ore flow can be obtained. Like other chutes, the solid material is stratified by specific gravity during the flow. The heavy minerals in the lower layer rub against the bottom surface of the chute, so the flow rate is very slow, and the upper layers of minerals are lighter, so the flow rate with water is very fast. As the chute gradually tapers, the resulting flow layers are vertically separated, with the result that the speed difference is increasing. Due to the different pulp discharge speeds of each layer, a fan shape is formed at the discharge end, which can be divided into heavy products, medium mines and light products by means of the cutting plates.
Fan chute widely used treatment of low grade sands, iron ore is also treated fine fraction, tin tungsten ores and minerals, but not as coarse-grained high processing effect.
4. What are the advantages of the fan-shaped chute? What are the factors that influence the selection process?
The advantages of the fan-shaped chute are: simple structure, light weight, and low cost (in China, wood is generally used as a chute), compared with other chutes, the water consumption is small and the productivity is high.
The factors affecting the selection process of the chute are: 1) the size of the ore. If the ore amount is too large or too small, the selection index will be lowered. Especially when it is too large, the damage to the selection process will be more serious.
2) The change of pulp concentration also has a great influence on the selection process.
At present, these two factors are difficult to accurately control under the existing production conditions, and the selection indicators fluctuate greatly.
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