New technology and new technology of jigging beneficiation (10)

The side drum type jig cannot be made too large because the water flow is difficult to distribute evenly along the width of the screen surface. In 1955, the screened air chamber (高桑) jig appeared in the world, as shown in Figure 24. The machine directly places the air chamber under the sieve, and achieves the effect that the water speed is evenly distributed along the screen surface and the floor space is reduced. The jig can be developed to a larger scale. China in recent years has made LTX series of products, the largest screen surface 35 m ^2, washing can not graded from 0 to 100 mm of the original coal. The throughput is designed to be 350 to 490 tons per hour. The numerical control electromagnetic damper is used, and the buoy electromagnetic speed control system is used to automatically control the discharge. The operation is sensitive and reliable, and it can be used in large-scale coal preparation plants with equipment of 300~4 million tons/year.

(3) Factors affecting the jigging beneficiation process factors affecting the jigging beneficiation process index, in addition to the ore properties, there are also ore supply, stroke, stroke, ore supply, under-supplement of water, artificial bed layer composition and Thickness, screen slope, drop, etc.
(1) Processing capacity of the jig The suitable feeding amount of the jig is currently not calculated by a reliable formula, and similar ore estimates can be processed according to the same type of jig. Table 16 lists a set of empirical values.

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The longitudinal running speed of the bed should be compatible with the stratification speed. For the easy ore selection, the slope or drop of the screen surface should be appropriately increased.
(2) Stroke, stroke The stroke and stroke should be determined according to the nature of the ore, the ore particle size is large, the density is large, and the bed is thick. The amount of ore is large, and the large stroke should be adopted, and the corresponding stroke should be reduced. vice versa. The diaphragm jig for eccentric link transmission can be calculated as follows:

(3) Bed Looseness The stroke, stroke, ore supply, undersize water and bed thickness determine the looseness of the bed, thus affecting the delamination speed and product quality. The loose form of the bed is generally raised after the upper ore grain is raised, and the looseness is changed from bottom to top. Therefore, the bed layer is mostly tight in the middle and loose at both ends, but the average looseness is not large. It is about 0.5~0.6. The average looseness of a moment can be calculated as follows: