Ore Separation Vibrating Screen

The ore separation vibrating screen is a vibrating screening equipment used for grading the crushed ore by particle size, dehydration, and desilting. It is placed immediately after the crusher in the beneficiation process and is responsible for the crucial task of "sifting out the qualified particle sizes and returning the unqualified ones for re-crushing". The quality of its operation directly affects the processing capacity of the entire production line and the particle size compliance rate of the final products.

The exciter structure is reliable - it uses a block eccentric exciter (for circular vibrating screen) or a box-type exciter (for linear vibrating screen). The bearings are SKF/FAG large clearance self-aligning roller bearings, lubricated with thin oil + labyrinth seal, preventing dust from entering and capable of continuous operation for 8,000 hours without maintenance. The exciter is connected to the screen box through high-strength bolts, making disassembly and assembly convenient.
The screen box has strong rigidity and a long lifespan - the side plates of the screen box are made of Q345B low alloy steel (thickness 6–12 mm), the cross beams are made of seamless steel tubes or rectangular tubes, and there are internal reinforcing plates. The overall annealing eliminates welding stresses. In the ore processing scenario, the thickness of the side plates is 2–4 mm thicker than those of ordinary sand and stone screens, providing resistance to fatigue cracking.
The screen mesh is diverse and wear-resistant - it can be equipped with woven screen mesh (steel wire/manganese steel, hole diameter 1–100 mm), perforated screen plates (wear-resistant steel, hole diameter 10–150 mm), and polyurethane screen mesh (wear-resistant, anti-blocking, low noise, suitable for fine screening). For coarse screening of ores, perforated screen plates are commonly used (resistant to impact), while for fine screening, polyurethane is commonly used (with a lifespan 3–5 times that of steel mesh).
The amplitude/tilt angle can be adjusted - for the circular vibrating screen, the amplitude is adjusted by the counterweight block (8–12 mm), and for the linear vibrating screen, the amplitude is adjusted by the eccentric block angle (6–10 mm). The screen surface tilt angle is 15°–25° for the circular vibrating screen and 0°–10° for the linear vibrating screen (negative tilt angle during dehydration). On-site, the screen angle can be flexibly adjusted according to the moisture content and particle size of the ores.

1. Startup - Start the vibrating screen motor (without load) first. Wait until the amplitude stabilizes (about 10–15 seconds), then start the feeding equipment. Do not start with material loaded (it will damage the exciter and the screen mesh).
2. Feeding - The material is evenly distributed on the screen surface through the chute or belt conveyor. The feeding width should account for 80%–90% of the screen surface width. Do not feed unevenly (the screen mesh on the overloaded side will be overloaded, while the other side will run empty, significantly reducing the screening efficiency). The feeding drop should be ≤ 300 mm. Avoid directly dropping large pieces onto the screen mesh (add a buffer plate or a stepped chute).
3. Screening process - The material forms a layer on the screen surface. In the circular vibrating screen, the material does circular projection, and the layer rolls. Fine particles quickly sink through the screen mesh; in the linear vibrating screen, the material does linear projection, and the layer is thin, with clear stratification, and the screening rate is high. The material on the screen is discharged from the discharge end, and the material on the screen falls into the collection hopper.
4. Shutdown - Stop the feeding first. Wait until the material on the screen surface is emptied (about 1–2 minutes), then stop the vibrating screen motor. Do not shut down when there is remaining material on the screen surface (it will be difficult to start next time and the remaining material will damage the screen mesh).

Classification of broken production line: After coarse and medium crushing, the circular vibrating screen separates the ore into "qualified particle size (sent to the next stage)" and "unqualified particle size (returned for re-crushing)", which is the core equipment of the closed circuit crushing system.
Classification of grinding circuit: The output of the ball mill is classified by the linear vibrating screen. Fine particles are sent to flotation/magnetic separation, while coarse particles are returned to the ball mill to improve grinding efficiency.
Dewatering and desilting: After heavy media separation in the coal preparation plant, desilting is carried out; in the mineral processing plant, the concentrate is dehydrated, and the tailings are dried for discharge. The linear screen is equipped with polyurethane screen mesh + negative inclination angle, achieving high dewatering efficiency.
Washing/soiling removal: Ore with high clay content (such as bauxite, red earth nickel ore) is first washed and deiled by the circular vibrating screen, and then sent for crushing.
Mobile crushing station matching: After mobile jaw crusher/cylindrical crusher, it is connected with a mobile vibrating screen (track or tire type), enabling on-site screening and reducing transportation.

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