What are the main factors affecting jigs?

　　There are many factors that affect the operation of jigs, mainly including structural factors, operational factors, and raw ore properties.

(1) The structure of the jigs has a significant impact on the separation indicators, and should be fully considered in the design and manufacturing process
① The screen area of the jig chamber is an important factor affecting productivity. Increasing screen area can improve productivity;
② The mesh size is determined based on the feed particle size and the discharge method of heavy products;
③ The number of jigs depends on the properties of candidate materials, ore supply, and product quality requirements; ④ The stroke coefficient determines the uniformity of water flow distribution. The larger the value, the more uniform the distribution of water flow;
⑤ The height difference between the front and rear sieve plates, that is, the size of the droplets, directly affects the speed of material flow. When the material selectivity is good, the droplets will be larger. When materials are difficult to choose and product quality requirements are high, the pressure drop should be small.
(2) Operational factors
① Stroke strokes
This is one of the important factors affecting the sorting index of the jigs. Due to the fact that the stroke and number of strokes determine the velocity and acceleration of the water flow, it directly affects the loose and layered state of the bed and the impact of the water flow on the ore particles, thereby affecting the sorting effect. Generally speaking, when the separation particle size is coarse, the density is high, the processing capacity is large, and the amount of water added under the sieve is small, a larger stroke and a smaller number of strokes can be used; When the particle size is small and the bed is thin, use smaller strokes and larger stamping times.
② Adding water under the sieve of the jigs can increase the looseness of the bed and reduce the suction intensity. When selecting wide graded materials, the amount of water screened should be small, which can reduce the upward water flow velocity and prevent high-density fine-grained materials from being washed into the overflow. When selecting narrow graded coarse-grained materials, the amount of water screened can be appropriately increased to make the bed loose.
③ The bed thickness can be divided into three layers: upper, middle, and lower. The upper layer is the light mineral flow force layer, the lower layer is the heavy mineral settling layer, and the middle layer is the continuous layer or transition layer. The thickness of the bed directly affects the quality and recovery rate of the jigs. Generally speaking, when the density difference between heavy and light minerals is large, the bed can be thinned to accelerate the stratification speed and improve processing capacity; When the quality requirements for concentrate are high, the bed layer should also be thick, because the bed layer is thick, particles are difficult to pass through, the stratification time is long, and the quality of heavy products is high. When processing fine-grained materials and unloading ore under the screen, an artificial bed must be laid on top of the screen.
④ Feed concentration is one of the factors that determine the horizontal flow rate of the selected material in the jig process. The suitable feed concentration is generally 20% to 40%.
⑤ Generally speaking, while ensuring the grade and recovery rate of the concentrate, the processing capacity should be maximized. However, when the processing capacity exceeds a certain range, the loss of useful minerals in tailings will increase. When the required grade of concentrate is high, the processing capacity will correspondingly decrease.
(3) The influence of ore properties
For jig beneficiation, the important ore properties are density composition and particle size composition.
The density composition of ore determines the selectivity of materials. The greater the density difference between light minerals and heavy minerals, the higher the separation efficiency.
The particle size composition of the ore determines the properties of the ore layer, the resistance of water passing through the ore layer, and the size of the gaps between particles. It has a significant impact on the looseness and stratification of the ore layer.