What effect does the shaker structure have on its selection process?

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The effect of the shaker structure on its selection process is described as follows:

(1) The shape and size of the bed surface. The geometry of the bed surface is divided into rectangles, trapezoids and diamonds, as shown in Figure 32 . Structurally speaking, the rectangular bed surface is the simplest, but the area utilization rate is low, and the area of ​​the non-mineral flow area is large, so the bed surface is generally made trapezoidal or diamond-shaped. The shaker surface produced in China is mostly trapezoidal, and the ore end is wider, and the concentrate discharge end is slightly narrower. ( such as the size of a common industrial shaker is 4500mm × 1800mm × 1500mm ) . The diamond bed surface not only has a high area utilization rate, but also has a higher sorting efficiency due to the extension of the sorting zone. The disadvantage is that it is inconvenient to configure and operate. This type of bed is used more abroad.

The aspect ratio of the bed surface has an influence on the selection index, increasing the length, extending the selected belt, and improving the grade of heavy minerals; increasing the width can make the tailings have more chances to be sorted, which is conducive to improving the recovery rate.

(2) Bedside paving materials. There are three purposes for paving the bed: preventing water leakage, improving wear resistance and ensuring a certain roughness ( coefficient of friction ) . The paving material can be coated with a thin rubber sheet, a ash (a lacquer with a certain proportion of calcined gypsum ) , a spray coating of a polyurethane glue, and the like.

Figure 32 Bed geometry

A— rectangular bed surface; b— trapezoidal bed surface; c— diamond bed surface

(3) Bed shape and configuration. The role of the bed is to maintain a certain thickness of the ore layer, and to discharge the layered upper layer of light minerals one by one. The cross-sectional shape and arrangement of the bed affects the flow characteristics of the lateral flow on the bed, thus affecting the looseness and recovery of the ore layer. Lower limit.

The bed is raised ( with wooden strips, bamboo strips, plastic strips or rubber strips attached to the bed ) and grooved ( grooved on the bed ) . The cross-sectional shape of the raised bed strip has a rectangular shape, a triangular shape, a trapezoidal shape, a zigzag shape, and the like, and the sectional shape of several kinds of bed strips is as shown in FIG. Bed strips of rectangular or trapezoidal cross section as shown in FIG suitable grit is selected from 33a Shown, the ridges of the sawtooth and triangular section adapted to sand and sludge selected from the group shown in FIG. 33b. The section shape of the grooved bed is triangular, suitable for the beneficiation mud, as shown in the figure 33c Shown.

Figure 33 sectional shape and arrangement of the bed

A— rectangular bed strip; b— trapezoidal bed strip; c— serrated bed strip; d— delta bed strip; e— grooved bed strip

The bed strips are generally arranged parallel to the tailings side line of the tailings, and the number of strips varies from 27 to 60. The height of the bed is gradually reduced from the transmission end to the concentrate discharge end, and the beds at the end are The strip is slanted along a diagonal line with an angle of 30° to 40° to the tailings edge , as shown in Figure 34 . From the side of the ore supply to the lower tailings side bed is gradually increased.

(4) bed layers: a single layer and multilayer shaker points, large capacity multilayer shaker, small footprint, used for sorting of coal slimes and options.

Figure 34 The arrangement of the bed on the bed

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