What is the selection process and working principle of the shaker?

2019-12-28 11:06:13

The flushing water fed into the water tank is covered with a laterally inclined bed surface and forms a uniform beveled thin layer of water. When the material (generally a hydraulic graded product, the concentration of 25%~30% of the slurry) flows from the feed tank to the bed surface, the ore particles are loosened and layered by the water flow flushing and bed vibration in the groove of the bed. . The upper layer of light mineral particles is subjected to a large impulse, and most of them move obliquely downward along the lateral direction of the bed surface, and the discharge is called tailings. The side of the bed surface is called the tailings side. The heavy mineral particles located at the bottom of the bed are moved longitudinally by the differential motion of the bed surface, and the discharge from the opposite side of the transmission end is called concentrate, and the corresponding bed surface position is called the concentrate end. The different sizes and sizes of the ore particles are different in the lateral and longitudinal directions on the bed surface. The final direction of motion is different, and the fan-shaped expansion on the bed surface can be used to extract a variety of products of different quality, as shown in FIG. .

The working principle of the shaker: Shaker sorting is realized by the joint action of the bed surface and the lateral water flow. The bed or groove on the bed surface is longitudinal, close to the direction of the water flow, and the water flow flows in the groove when it flows laterally. The formation of eddy current, eddy current and bed surface vibration can make the ore layer loose and stratify according to density, heavy minerals turn to the lower layer, light minerals turn to the upper layer, which is called “ separation and stratification ” , and the upper layer of light ore is subjected to water flow. The large impulse, while the lower heavy ore particles are subject to less impulse, so the lateral movement speed of the light ore particles on the bed surface is greater than the lateral movement speed of the heavy ore particles on the bed surface.

Figure 30 Sectoral zoning of ore particles on the shaker surface

AB - overflow and slime belt; BC - tailings belt; CD - medium ore belt; DE - concentrate belt; EF - blank area ( no ore zone )

In the longitudinal direction, the differential movement of the bed surface ( initially moving at a slow speed and gradually accelerating, suddenly retreating when the speed reaches the maximum, gradually decreasing during the retreat, and then advancing, repeating the above process ) not only promotes loose stratification of the ore layer Moreover, the heavy ore particles are moved forward in the longitudinal direction at a relatively large speed, so that the light ore particles move forward at a small speed.

The direction of the ore particles depends on the speed of synthesis of the longitudinal and transverse velocities, as shown in FIG. Heavy minerals have a small cross

Figure 31 Schematic diagram of the movement speed of light and heavy mineral particles on the bed surface

For velocity and large longitudinal velocity, light minerals have large lateral velocity and small longitudinal velocity. The parallelogram method is used to synthesize longitudinal and lateral velocity. It can be seen that the combined velocity of heavy minerals is biased toward the concentrate of the shaker. At the end of the ore discharge, the light minerals are biased toward the tailings side of the shaker, and the medium-density particles are located between the two. The process is called “ transporting and zoning ” .

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