Cone resuspension concentrator

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The equipment structure for the concentration of conical resuspension ore processing involves a body in the form of an inverted cone-shaped trough, within whose center there is a hollow rotating shaft that is driven to rotate by an electric motor; this hollow shaft also serves as an air lift pipe for discharging the heavy products. Outside the hollow shaft, there is a sleeve with a diameter of 7L; two angular scrapers are fixed to this sleeve and rotate at a speed of 4–5 r/min. This helps to maintain uniform density in the suspensions in the upper and lower layers, as well as to prevent ore from settling. The selected raw materials are provided from the upper surface. Light products float on the surface of the suspension and are discharged through the peripheral weir, while heavy minerals sink to the bottom. Meanwhile, compressed air is supplied from the bottom of the hollow shaft, and within the small hollow shaft a gas-liquid-solid mixture composed of heavy minerals, a heavy suspension, and air is formed. When its overall density is lower than that of the external heavy suspension, it flows upward along the tube under the effect of hydrostatic pressure, thereby lifting the heavy minerals to a higher position for discharge. The heavy suspension is fed through a sleeve and enters the sorting cone via the orifices. The air lift tube can also be placed outside the sorting cone. However, regardless of the configuration, the level of the heavy minerals at position 11 should be about 2 meters above the level of the separation liquid, so that the suspension separated by screening can flow back into the separation cone on its own. This type of sorter has a deep tank, a large sorting area, and stable operation, making it suitable for processing raw materials with a high yield of light products. The sorting accuracy is high. The main disadvantages are the requirement to use fine-grained weighting agents, a large volume of medium circulation, which increases the workload for medium preparation and collection, as well as the need for a dedicated compression device. The diameter of the cone used in this type of equipment is 2–6 meters, the cone angle is 50 degrees, and the particle size range of the feed material is 5–50. The Chaihe lead-zinc mine processing plant in our country uses cone crushers with a diameter of 2.4 meters for the preliminary sorting of ore.