Screening equipment commonly used in mineral processing

In mineral processing production, materials are often crushed and ground after the use of screening tools to separate the mixture of different size into various size levels. There are many types of screening equipment commonly used in mineral processing plants, such as fixed screens, vibrating screens, cylindrical screens, fine screens and tumbler screens. Material characteristics, beneficiation process requirements and screening equipment performance and application conditions are the selection of screening equipment must be considered when the beneficiation plant, the most commonly used is the vibrating screen. The following lists the characteristics of several common screening equipment and application range for reference.

1. Vibrating screen

Vibrating screen can be divided into linear vibrating screen, circular vibrating screen and fine vibrating screen with different trajectories of screen frame movement. Here we mainly introduce the circular vibrating screen: circular vibrating screen is a new type of vibrating screen with circular vibration, multi-layer and high efficiency. Circular vibrating screen adopts cylinder type eccentric shaft exciter and eccentric block to adjust the amplitude, screening specifications, with reliable structure, strong excitation force, high screening efficiency, low vibration noise, sturdy and durable, easy maintenance, safe use, etc. The vibrating screen is widely used in mining, building materials, transportation, energy, chemical and other industries for product classification.

2. Fixed sieve

Fixed sieve has two kinds of grizzly sieve and bar sieve. The grizzly screen is mostly used in the upper part of the raw ore bin or coarse crushing bin, as a control of the size of the raw ore, generally for horizontal installation. Strip sieve is mostly used for coarse crushing or crushing before the pre-screening, sieve hole generally should not be less than 50mm. Installed in the crusher before the strip sieve at the same time play the role of the flow trough, its inclination angle is generally 40-50 °, if the ore contains mud and water, the inclination angle can be increased by 5-10 °.

3. Arc sieve

Arc sieve is generally used for wet classification of fine-grained materials, dewatering, heavy media beneficiation of the demineralization operation. Its structure is simple, light, small footprint, no moving parts, large capacity, high separation accuracy, sieve hole is not easy to block, but the sieve product moisture is high, the sieve bar wears fast, the ore requirements uniform and requires a certain pressure effect.

4. Tumbler sieve

Tumbler screen is often used for coarse grain material screening, feeding the maximum size up to 500mm, suitable for screening large coal, limestone and shale, can also be used as a washing machine or ore feeder. Tumbler screen screening efficiency is high, sieved material over crushing less, installation height is small; but the structure is more complex, bulky, screening hard materials when the roller wear faster. Currently in metal mines are mostly replaced by heavy vibrating screen.

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