Mineral screening equipment
Use screening equipment are: mineral processing plants, with pre-screening and crushing operations inspection operations, sorting operations are respectively prepared before screening; In crushing and screening plants, as the material into various grain size products Independent screening; in addition, it can also be used for auxiliary operations such as dewatering, de-sludge and de-mediation.
The main types of screening equipment commonly used in mineral processing plants are: vibrating screen, fixed sieve, rolling sieve, cylindrical sieve, curved sieve and fine sieve.
The vibrating screen commonly used in mineral processing plants is classified according to its structure, function principle and use:
Types of | model | Maximum feed size Mm | Screen size Mm | use |
Inertial vibrating screen | SZ | 100 | 6~40 | Suitable for classification and dehydration of medium and fine particulate materials |
Automatic center vibrating screen | SZZ | 150 | 6~50 | Widely used for screening classification of medium and fine grain materials |
Heavy vibrating screen | H | 300 | 10~100 | Widely used for screening and grading of bulk materials |
Circular vibrating screen | YA | 400 | 6~50 30~150 | For grading and grading of large and medium and fine granules |
Single-axis vibrating screen | ZD | 100 | 6~50 | Suitable for screening and classification of medium and fine grain materials |
Double shaft vibrating screen | DS/ZS | 300 | 0.5~13 13~50 | Used for screening large and medium and fine materials |
Linear vibrating screen | ZKX/ZKB | 30 300 | 0.15~13 3~80 | Suitable for screening, dewatering, de-intermediation, desliming and wet grading of large and medium and fine granules |
Resonance screen | SZG | 150 | 12~20 | Screening and grading for medium and fine grain materials |
High frequency vibrating screen | Used for classification, dehydration and slag removal of fine materials | |||
Electromagnetic vibrating screen | 5~60 | Used for screening and double as mining equipment |
Inertial vibrating screen
The inertial vibrating screen has a single layer, a double layer, a seat type, and a hanging type. The vibrator of the screen is mounted on the screen box and vibrates up and down with the screen box. The belt center line also moves in space, causing the belt to be loose and tight, and the motor is unstable. The greater the amplitude, the more unfavorable the motor. Therefore, the inertial vibrating screen is only suitable for processing, fine-grained materials. The amplitude of the screen box also fluctuates with the amount of ore given, and the instability of the ore amount will affect the screening efficiency. Therefore, it is required to uniformly feed the mine.
Self-centering vibrating screen
The advantage of the automatic center vibrating screen is that the structure is simple, easy to manufacture, convenient to operate and adjust; the screen surface vibrates strongly, the material is not easy to block the screen hole; the screening efficiency is high (up to 90~95%). The disadvantage is that the amplitude of the sieve varies significantly with the fluctuation of the ore supply (too large or too small), so that the screening efficiency is not stable enough; the screening increases during the start-up and stop, and the growth rate is large. influences. The vibrating screen has a wide range of use, and the screening of medium and fine-grained materials in domestic large and medium-sized plants is mostly used.
Heavy vibrating screen
The vibrating screen structure is relatively strong and can withstand large impact loads. It is suitable for screening large ore and dense ore with a maximum blockiness of 400mm. This machine can replace the easily clogging bar screen as a pre-screening device before the crushing. It can also be used as a washing equipment for large ore with a lot of mud. In recent years, such vibrating screens have been used as pre-screening in many large foreign concentrators before the crushing. The screens are multi-layered and used to screen out the final product, thus increasing the throughput of the crusher. Reduce the impact of water-rich powder ore on crushing operations.
Circular vibrating screen
The YA type circular vibrating screen is available in light and heavy duty, seat and hanging styles, with a working area of ​​4m2 to 14m2. The sieve has novel structure, high strength, reasonable vibration parameters, fatigue resistance, long service life, simple maintenance, low noise and high screening efficiency. In coal, metallurgy mining, building materials, chemical industry as a screening grading of bulk material. The screen structure has a woven mesh screen, a punched sieve plate and the like.
Single-axis vibrating screen
The single-axis vibrating screen has a circular trajectory, and has the advantages of simple structure, convenient maintenance, reliable operation, high efficiency, good permeable permeability, and the like, and is suitable for grading of medium and fine materials.
The screen surface of the two-axis vibrating screen (ZSD type) adopts a polygonal line type with different inclination angles, and the thickness of the layer from the feeding end to the discharge end layer is constant or increasing, and the moving speed of the material on the screen surface is decreasing. The advantage of the equal-thickness sieving method is that it can reduce the clogging of the sieve hole when sieving the fine-grained grade (less than 25mm) material; the treatment capacity is high, the equipment is convenient to be equipped, and the plant area is small. The disadvantage is that the installation height is large. The sieve can be used for dry or wet screening of medium and small particulate materials such as coal, ore and gravel.
Linear vibrating screen
The linear vibrating screen has ZKX type suitable for processing large and medium-sized and fine-grained materials, and ZKB type suitable for dehydration, de-intermediation, de-mudging and dry or wet material classification of fine-grained materials.
The trajectory of the sieve is straight, and the screen surface is horizontally mounted. The movement of the material on the screen surface does not depend on the inclination of the screen surface, but depends on the direction angle of the vibration. The screen has compact structure, high strength, reasonable vibration parameters, fatigue resistance, long service life, convenient maintenance and good reliability; stable vibration and low noise; the same trajectory of each point on the screen surface is beneficial to the screening of materials and high screening efficiency. . Disadvantages are complicated structure, high manufacturing precision, easy adjustment of amplitude, and large weight of vibrator.
Linear vibrating screens are widely used in coal preparation plants, metallurgical mines, building materials, light industry and chemical industries. In the metal concentrator, the self-grinding machine , the gravel mill or the ball mill constitutes a closed circuit classification, and the classification efficiency is higher than that of the spiral classifier.
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