Screw classifier with fine material dewatering and recovery system
The spiral classifier is widely used in the grading of the grinding circuit of the concentrator and the operations of washing, de-sludge, and dewatering. Its main advantages are simple equipment construction, reliable operation, and convenient operation. It can be self-flowing with energy-saving ball mill in the closed-circuit grinding circuit. It is suitable for wet magnetic separation of magnetite, pyrrhotite, roasting ore, ilmenite and other materials with particle size below 3mm. It is also used in coal and non-metallic minerals. Iron removal operations for materials such as building materials. It’s also named screw classifier.
screw classifier used in sand washing plant
Compared with the hydro cyclone, the power consumption is lower. The main disadvantages are low classification efficiency, heavy equipment, and large floor space. Due to the limitation of equipment specifications and production capacity, it is generally not possible to form a closed circuit with a ball mill with a specification of Φ3.6m or more.
Application range Mainly used in the classification of various non-ferrous metal ore dressings such as quartz sand, gold, iron, aluminum, etc. It can also be used for the classification of materials such as pulp and ore.
The model of the screw classifier is different, the processing capacity is different, and the processing capacity of the spiral classifier is 30~240 m³/h.
The classifier is structurally divided into two types: sorghum type and submerged type. The high-grade classifier is suitable for coarse-grain classification. The maximum particle size of the overflow is generally 0.4~0.15mm. The sinking classifier is suitable for fine-grain classification. The maximum particle size of the overflow is generally below 0.15mm.
It is mainly composed of a grading tank, a spiral, a swaying device, a lifting device, and upper and lower support.
1. Grading tank: It is a welded structure of steel plate steel, the bottom is semi-circular, the upper end opens the sand outlet, and the lower end is closed to form a slurry pool.
2. Spiral: It consists of a hollow shaft, a bracket, a blade, a lining iron, and the like. Stirring the slurry and conveying the grit. The spiral blades are made of wear-resistant cast iron and are easily replaced after wear.
3. Transmission device: It consists of an electric motor, belt drive, and reducer, etc. It is used to drive the spiral rotation. In order to adapt to different working conditions, the screw speed should be adjustable.
4. Lifting device: The small spiral classifier adopts the screw to pay the manual lift, and the large-scale adopts the electric lift. When starting, suddenly stopping or overhauling, the lifting device can be lifted by the lower lifting end. To ensure the safety of the lifting, there is no automatic limiting mechanism.
5, the lower support: through the flange and the hollow shaft connection, the lower support is immersed in the slurry for a long time, so the bearing should have a good seal.
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