Process factors affecting jigging sorting
The factors affecting the process of jigging sorting mainly include the factors such as stroke, punching, feeding water, adding water under the screen, bed thickness, artificial bed composition and feeding amount. The particle size and density composition of the feedstock, the thickness of the bed, the drop of the sieve plate, and the form of the jigging cycle curve, although having an important influence on the sorting index of the jigging, are very limited in the production process.
1 stroke and stroke
Stroke and stroke are directly related to the looseness and loose form of the bed, which has a decisive influence on the jigging sorting index. It needs to be determined according to the nature of the treated material and the thickness of the bed. The principle is: 1 bed thickness, when the treatment volume is large, the stroke should be increased, and the stroke should be reduced accordingly; 2 when processing the coarse-grained material, the stroke is large stroke. Low-stroke, and small-stroke, high-shock when handling fine-grained materials.
Excessively increasing the number of strokes will make the bed less than loosely expand, and become more compact. When the stroke is particularly high, the bed will even rise as a whole and the whole will fall like a piston, resulting in a sharp drop in the jigging speed index. Therefore, the variation range of the diaphragm jig is generally 150~360r/min, and the stroke of the non-piston jig and the moving sieve jig is generally 30~80r/min. If the stroke is too small, the bed layer will not be fully loose, and the high-density coarse particles will not get the suitable space for transferring to the bottom layer; if the stroke is too large, the bed will be too loose, and the particle size and shape will obviously interfere with the density. Layering, when selecting wide grade materials, high density fine particles are lost in large amounts in low density products. The appropriate jigging stroke for a particular material usually needs to be determined by experimentation.
2 Add water to the mine water and under the sieve
The sum of water for the mineral water and the bottom of the sieve is the total water consumption for the jigging. The ore water is mainly used to wet the feedstock and has proper fluidity. The solid mass fraction in the feedstock is generally 30% to 50% and should be stable. The additional water under the sieve is the main means to adjust the looseness of the bed during operation. When processing narrow-level materials, the additional water under the sieve can be larger to increase the stratification speed of the material; when processing the wide-grade material, it should be smaller to increase Inhaling effect. 5至8米3。 The total water consumption per ton of jigging material is usually 3.5 to 8m3.
3 Bed thickness and artificial bed
The thickness of the bed in the jig (including the artificial bed) refers to the height of the screen to the weir. The appropriate jigging bed thickness is determined by factors such as the type of jig used, the density difference of the components to be separated in the feedstock, and the feed size. When using a diaphragm jig to treat medium-sized or fine-grained materials, the total thickness of the bed should not be less than 5 to 10 times the maximum particle size of the feedstock, generally in the range of l20 to 300 mm. When processing coarse materials, the thickness of the bed can reach 500mm. In addition, when the density difference of the components to be separated in the feedstock is large, the bed layer may be appropriately thinner to increase the delamination speed and increase the productivity of the equipment; if the density difference of the components to be separated is small, the bed layer may be thicker to Improve the quality of high density products. However, the thicker the bed, the lower the productivity of the equipment.
The artificial bed is the primary means of controlling the rate of discharge through the screen and the quality of the discharged high density product. In production, the artificial bed layer must be kept at the bottom layer of the bed. For this purpose, the material used as the artificial bed layer should have a particle size of 2 to 3 times the size of the mesh and 3 to 6 times larger than the maximum particle size of the selected material. The density is preferably close to or slightly larger than the high density product. High-density coarse particles in the feedstock are often used in the production as artificial beds. When sorting fine-grained materials, the thickness of the artificial bed layer is generally 10~50mm, and it can reach 100mm when sorting a slightly thicker material. The higher the density of the artificial bed, the smaller the particle size and the greater the thickness of the laying, the smaller the yield of the high-density product, and the lower the recovery rate, but the higher the density.
4 board gap
The height difference between the two adjacent jigging sieve plates is called the sieve plate drop, which helps to push the material to the discharge end. In general, when dealing with coarse-grained materials or materials with a large difference in density of components to be separated, the drop should be larger; when handling fine-grained materials or difficult-to-select materials, the drop should be smaller. The drop plate of the side-by-side diaphragm jig and the trapezoidal jig is usually 50 mm, while the sieve of the coarse jig has a drop of 100 mm.
5 Feeding properties and ore supply
The handling capacity of the jig is closely related to the nature of the feeding. When the coarse process, easy dressing stone, high density and quality of the product is less demanding, larger amount of ore; should be smaller and vice versa. At the same time, in order to obtain better sorting index, the particle size composition, density composition and ore concentration of the ore should be kept as stable as possible, especially for the ore, not too much. The handling capacity of the jig varies greatly depending on the size of the ore, the density difference of the components to be separated in the ore, the operational requirements and the equipment specifications.
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