What are the main points of shaker selection, installation and operation?

The choice of the shaker is determined by the maximum particle size, treatment volume and plant area of ​​the selected ore. Feed size is greater than 0.2mm When using a coarse sand shaker, the particle size is 0.2 ～ 0.074mm Use a fine sand shaker with a smaller particle size 0.074mm Shake with a slime. The finer the particle size of the selected material, the lower the capacity of the shaker. For example, treatment with a cloud shaker tin cassiterite, feed size 0.5 0.2mm The production capacity of the coarse sand shaker is about 0.8 to 1.0 t / h , and the treatment is 0.074 ~ 0 .04mm The production capacity of the mud shaker is only 0.2 ~ 0.3t / h . When the plant area is small and the single-layer shaker cannot be opened, a multi-layer shaker can be used.

Shaker installation requirements are flat, there should be no abnormal beating during operation, the longitudinal direction is generally horizontal, but when processing coarse raw materials, the concentrate end should be 0.5° higher to improve the selection effect; and the shaker for handling fine mud The concentrate end should be 0.5° lower to facilitate the fine grain concentrate moving forward.

The operating points of the shaker have the following aspects:

(1) Appropriate strokes and strokes. The appropriate values ​​for stroke and stroke are primarily related to the particle size of the selected material, and secondly to the shaker load and ore density. When dealing with materials with large grain size and thick bed, large strokes and small strokes are used; when treating fine sand and slime, the opposite is true, and small strokes and large strokes should be used. Large strokes and strokes should be used when the load on the bed is increased or when a larger density of material is selected. The appropriate values ​​for strokes and strokes should be carefully examined in practice to determine.

(2) Suitable lateral slope of the bed surface. Increasing the lateral slope, the granulation of the ore is enhanced, and the discharge speed of the tailings is increased, but the zoning of the selected area is narrowed. Generally, when handling coarse-grained materials, the cross-slope should be larger; when handling fine-grained materials, the cross-slope should be smaller. For example, the cross slope angles of coarse sand, fine sand and slime shakers are: 2.5° to 4.5° , 1.5° to 3.5°, and 1° to 2° . In addition, the lateral slope of the shaker should be matched with the size of the horizontal flow to have a good sorting effect.

(3) The size of the rinse water should be appropriate. The flushing water includes two parts of the ore water and the washing water. The flushing water should be evenly distributed on the bed surface and the size should be appropriate. The rinse water concentrate level is improved, but the recovery rate is reduced. Flushing water should be larger when handling coarse materials or selections.

(4) The ore amount is appropriate and uniform. The amount of ore given is related to the selected particle size. The coarser the particle size, the larger the amount of ore should be. For a specific material, the ore supply should be controlled in the bed surface utilization ratio, the zoning is obvious, and the tailings grade is within the allowable range. If the amount of minerals is too large, the recovery rate will drop significantly. In addition, once the ore amount is accurately determined, it must be kept consistently uniform, otherwise the banding will be unstable, causing fluctuations in the selection index.

(5) The quality of the ore is suitable. Generally, the mass fraction of the ore is between 15% and 30% . The coarse material can be thinner and the fine mud should be thicker. Most of the water to the ore tailings along the lateral flow strip, fine mud easily washed away, resulting in the loss of fine particles of metal minerals.

(6) Preparation of materials before they are selected. The upper limit of the shaker selection is 2 ~ 3mm , the lower limit is 0.037mm . Because the particle size has a greater impact on the selection index, the material should be graded before being selected. If the material contains a large amount of fine mineral mud, it is not only difficult to recycle, but also due to the increased viscosity of the slurry, the heavy mineral sedimentation becomes slow, resulting in the loss of heavy minerals. At this time, pre-desilting should be carried out.

(7) Material zoning on the bed surface and interception of the product. When the operating conditions are suitable, the material is clearly separated on the shaker, and the product is intercepted according to the required sorting index, which can be divided into 2 to 4 kinds of products. The mine is generally reprocessed. When the operating conditions change, the banding situation will change accordingly. At this time, the position to be taken must also be adjusted accordingly to ensure the stability of the sorting index. Therefore, the shaker operator must stick to the post, closely monitor the zoning situation, and make necessary adjustments at any time.

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