The slurry in the spiral groove flows along the groove under the action of gravity component, and at the same time, it is extended by the inertial centrifugal force to the outer edge. Thus, a flow characteristic in which the inner edge flow layer is thin, the flow velocity is low, the outer edge flow layer is thick, and the flow velocity is high is formed. According to the measurement, the thickness of the liquid near the inner edge is only 2 to 3 mm, which is a laminar flow state. The thickness of the flow layer near the outer edge is 7 to 16 mm, and the flow velocity is 1.5 to 2 m/s, showing a distinct turbulent flow regime. The amount of water fed is increased, and the wet period spreads outward, but has little effect on the flow characteristics of the inner edge. In addition to the longitudinal flow along the trough, there is also a lateral exchange between the inner and outer fluids, called the secondary circulation. Due to this circulation movement, the rising sub-speed occurs in the inner ring of the groove, and the outer ring has a falling sub-speed. The superposition of the longitudinal flow of the liquid stream and the secondary circulation results in a spiral motion of the liquid flow on the groove surface. The upper layer tends to the outer edge and the lower layer tends to the inner edge. The solid particles located in the slurry are governed by both the fluid motion characteristics and the self-gravity, inertial centrifugal force and groove bottom friction. After the slurry is fed to the spiral groove, it is loosened under the action of weak turbulence, and then stratified according to the principle of flow film separation. The ore particles generate inertial centrifugal force during the rotary motion along the trough surface. The heavy mineral entering the bottom layer is affected by the friction at the bottom of the trough. The moving speed is low and the centrifugal force is small. Under the action of gravity component, the maximum inclination along the trough surface tends to the inner trough. The inner edge of the movement; the upper layer of light mineral particles approaching the movement with the slurry, the speed is large, and is smashed to the outer edge of the groove. Due to the different directions of movement, the zoning is carried out on the groove surface, the heavy mineral is close to the inner ring, the light mineral is moved to the outer ring, and the fine outer slag is suspended in the outermost pulp. This zoning phenomenon has been demonstrated after the first lap and will continue to improve in the future. The secondary circulation continuously transports the ore particles along the bottom of the tank to the inner edge of the tank, and at the same time transfers the light minerals separated from the inner edge to the outer edge, promoting the development of the zone. By the third to fourth laps, the ore movement tends to be balanced and the zoning is completed. Plastic Pipe Making Machine ,Pvc Fittings Making Machine,Pvc Pipe Manufacturing Machine,Pvc Pipe Maker Hitech Intelligent Machinery(Ningbo)Co., Ltd. , https://www.machinehitech.com
Sorting principle of spiral concentrator