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Several structural factors affecting the process of shaker separation

table It is an efficient gravity separation equipment for fine ore separation, which is widely used for the separation of tungsten, tin, tantalum, niobium and other rare and precious metal ores, as well as iron and manganese ores. There are many factors that affect the mineral processing of the shaker, including structural factors, working factors, operation factors and so on. This paper mainly analyzes several structural factors affecting the process of shaker separation.

 table

1) Bed surfacing

There are three purposes of paving on the bed surface: to prevent water leakage, to improve wear resistance and to ensure a certain roughness (friction coefficient). Paving materials can be thin rubber board, paint ash (raw paint with a certain proportion of calcined gypsum) coating, polyurethane resin spray coating, etc.

2) Bed geometry and dimensions

The geometry of bed surface is divided into rectangle, trapezoid and rhombus. In terms of structure, the rectangular bed surface is simple, but the area utilization rate is low, and the area without ore flow area is large, so the bed surface is generally made into trapezoid or rhombic. In China, the shaking table surface is mostly trapezoidal, the feeding end is wider, and the concentrate discharge end is slightly narrow. (for example, the size of commonly used industrial shaking table is). The diamond bed not only has high utilization rate of area, but also improves separation efficiency due to the extension of separation zone. Its disadvantage is that the configuration and operation are not convenient. This kind of bed surface is widely used abroad.

The ratio of length to width of bed surface has an effect on the separation index, increasing the length and prolonging the cleaning zone can improve the grade of heavy minerals; increasing the width can make more separation opportunities of tailings, which is conducive to improving the recovery rate.

3) Bed bar shape and configuration

The role of bed bar is to maintain a certain thickness of ore bed and discharge the upper layer of light minerals after stratification step by step. The cross-section shape and configuration mode of bed bar affect the flow characteristics of transverse flow on the bed surface, thus affecting the loose mode of ore bed and the lower limit of recovery particle size.

There are two types of bed strips: protruding type (stick on the bed surface with wooden, bamboo, plastic or rubber strips) and grooving (grooving on the bed surface). The cross-section shapes of convex bed bar include rectangle, triangle, trapezoid and zigzag. Rectangular and trapezoidal cross-sections are suitable for coarse sand, while serrated and triangular cross-sections are suitable for fine sand and slime. The cross section shape of slotted bed bar is triangular, which is suitable for dressing mud.

The bed bars are generally arranged in parallel with the side line of tailings discharge on the bed surface, and the number of bed bars varies from 27 to 60. The height of bed bars gradually decreases from the transmission end to the concentrate discharge end. At the end, each bed bar pinches out along an inclined line with an angle of 30 ~ 40 ° with the tailings side line. The bed bar is gradually increased from the feeding side to the side of tailings.

4) Number of bed surface layers

The shaking table has single layer and multi-layer, multi-layer shaking table has large processing capacity, small occupation area, and is mainly used for beneficiation And coal preparation.

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