Circular vibrating screen is a screening equipment that works by using the compound rotary vibration produced by the vibrator excitation. Its vibration track is circular or elliptical, with high screening efficiency, large processing capacity and other advantages, is widely used in mining, metallurgy, coal, building materials, chemical industry and other industries. However, different industries have different material properties, production processes and capacity requirements, which determines the need to comprehensively consider a variety of factors in the selection of circular vibrating screen to ensure that the equipment can operate efficiently and stably to meet the production requirements.
一.Mining industry selection requirements
1.Material Characteristics
The mining industry handles a wide variety of ores, including iron ore, copper ore, gold ore, etc., whose hardness, particle size distribution, humidity and other characteristics vary greatly. For example, iron ore has high hardness, and when selecting the type, it is necessary to consider that the screen mesh material of the circular vibrating screen should have sufficient wear resistance, such as the use of high chrome alloy screen mesh. For ores with large particle size, the vibrating screen is required to have a large screen size and strong processing capacity to ensure that it can efficiently separate large ores from fine-grained materials. The humidity of the ore is easy to cause screen clogging, affecting the screening effect, at this time you need to choose a special screen structure (such as polyurethane screen, its surface is smooth, not easy to adhere to the material) and higher vibration intensity of the circular vibrating screen, in order to improve the screening rate.
2.Working environment
The working environment of the mine is relatively harsh, with large dust, strong vibration and large temperature changes. Therefore, the sealing performance of the circular vibrating screen is crucial, and good sealing can effectively prevent dust leakage, protect the internal transmission components of the equipment, and also meet the environmental requirements. In the structural design, it is necessary to ensure that the equipment has sufficient strength and stability to withstand long-term high-intensity vibration and poor working conditions. For example, the use of high-strength steel to make the screen box, optimise the support structure of the screen machine, and improve the seismic performance of the equipment. In addition, it is also necessary to consider the adaptability of the equipment in different temperature environments, and select appropriate lubrication systems and electrical components, so as to ensure that the equipment can operate normally in both low or high temperature environments.
二.Metallurgical industry selection requirements
1.Nature of materials
Metallurgical industry involves the treatment of many kinds of metal materials, such as steel slag, iron ore concentrate and so on. Steel slag has the characteristics of high hardness, irregular particle shape, and contains a certain amount of metallic iron. For steel slag screening, circular vibrating screen needs to be equipped with high-strength, impact-resistant screen mesh, such as the use of composite woven screen mesh, which can effectively screen steel slag, but also resist the wear and impact of metal iron in steel slag. Iron ore concentrate, on the other hand, is finer in particle size, and requires higher screening accuracy, usually need to choose the circular vibrating screen with smaller screen hole size and high screening accuracy, and to ensure the flatness and uniformity of the screen, so as to ensure the quality and recovery rate of iron ore concentrate.
2.Process flow
Metallurgical production process is complex, and the role of circular vibrating screen in it varies according to different links. In the raw material preparation stage, it is mainly used to classify the ore and other raw materials, and provide suitable particle size materials for the subsequent smelting process. At this time, according to the requirements of the process before and after the convergence of equipment, select the appropriate screening level and processing capacity of the circular vibrating screen. In the product processing stage after smelting, such as screening steel slag to recover the metal iron and produce construction aggregates, etc., it is necessary to accurately select the type according to the processing capacity of steel slag and product specification requirements. For example, if you want to produce construction aggregates with different particle size specifications, you need to choose the circular vibrating screen with multi-segment screening function and the ability to flexibly adjust the screen configuration to meet the particle size requirements of different products.
三.Coal Industry Selection Requirements
1.Coal Characteristics
Coal has a wide range of particle size distribution, from lump coal to pulverised coal. Coal with different particle size has different uses and different requirements for screening. When selecting the type, the circular vibrating screen with large screen area and strong processing capacity can be chosen to meet the rapid screening requirements of a large number of coals. For coal varieties with more stringent requirements on particle size, such as coking coal, it is necessary to choose circular vibrating screen with high screening accuracy to ensure that the coal particle size meets the requirements of the coking process, so as to ensure the quality of coke. In addition, the humidity of coal is also an important factor affecting the screening effect, wet coal is easy to bond into a ball, blocking the screen. Therefore, for coal with large humidity, circular vibrating screen with self-cleaning function can be used, such as the use of ultrasonic vibrating screen mesh and other technologies to improve the screening efficiency.
2.Production capacity
The production scale of the coal industry is usually large, whether it is the screening of raw coal in large coal mines, or the selection of coal in coal processing plants, all need circular vibrating screen with high production capacity. When determining the model and quantity of circular vibrating screen, it should be accurately calculated according to the annual production capacity of the coal mine or coal processing plant, hourly processing capacity and other parameters. For example, a large coal processing plant may need to process thousands of tonnes of coal per hour, which requires the use of multiple large models of circular vibrating screens to form a screening system, and to consider the spare parts of the equipment to cope with equipment failures and other emergencies, to ensure the continuity of production.
3.Explosion-proof requirements
Gas and other flammable and explosive gases exist in the coal industry, so the circular vibrating screen used in coal mines or coal processing plants and other places with flammable and explosive risks must have explosion-proof performance. In the selection, we should choose the explosion-proof circular vibrating screen that meets the relevant national explosion-proof standards, and its motor, electrical components, etc. should adopt explosion-proof design, and the shell of the equipment should have sufficient strength and sealing to prevent sparks or high temperatures from triggering explosive accidents. At the same time, the grounding and other safety measures of the equipment should be strictly inspected and maintained to ensure the safety of the equipment in the operation process.
四.Selection requirements of building materials industry
1.Material characteristics
Building materials industry involves screening of various materials, such as limestone, cement clinker, quartz sand, etc.. Limestone needs to be screened after crushing to meet the particle size requirements of different building material products. As the hardness of limestone is relatively low, but the output is large, when selecting the type, you can choose the circular vibrating screen with large processing capacity and low operating cost. Cement clinker temperature is high, and the particle size distribution is wide, which requires the circular vibrating screen to have high temperature resistance, and at the same time, it should be able to adapt to the screening requirements of different particle sizes. Quartz sand as an important raw material for glass and other building materials, the uniformity of particle size and purity requirements are very high, which requires the round vibrating screen to have high-precision screening performance, and can effectively remove the impurities and unqualified particles in quartz sand.
2.Product quality requirements
The quality of building materials is directly related to the quality and safety of construction projects, so the requirements for screening equipment are also very high. In the production of cement, the particle size distribution of cement particles has an important impact on the performance of cement, and it is necessary to choose the circular vibrating screen that can accurately control the screening size to ensure the stability of the quality of cement products. For the production of construction sand and gravel aggregates, different particle size aggregates have strict standard requirements, round vibrating screen should be able to accurately sieve the material into different specifications of the product to meet the needs of building construction. For example, the production of sand and gravel aggregate for concrete, the material needs to be accurately screened into 5-10mm, 10-20mm and other different particle size ranges of products, which requires high precision of the screen mesh of the circular vibrating screen, stable screening effect.
五.Selection requirements for the chemical industry
1.Material Diversity
The chemical industry handles a wide variety of materials with complex nature, including various chemical raw materials, intermediates and finished products. Some chemical materials are corrosive, such as sulfuric acid, hydrochloric acid, etc., in the selection of the need to choose a corrosion-resistant circular vibrating screen, its screen mesh, screen box and other components should be made of corrosion-resistant materials, such as stainless steel, engineering plastics and so on. For some flammable and explosive chemical materials, such as organic chemical raw materials, round vibrating screen must have good explosion-proof performance, similar to the coal industry, to choose the equipment that meets the explosion-proof standard to ensure production safety.
2.Process requirements
Chemical production process on the particle size of the material requirements are often very strict, different chemical products in the production process requires a specific particle size range of raw materials or intermediate products. For example, in the pharmaceutical industry, the particle size control of raw materials and finished products is directly related to the quality and efficacy of drugs, circular vibrating screen needs to have high screening accuracy and stability, and can accurately screen the material into the required particle size level. In the chemical synthesis process, in order to ensure the smooth progress of the reaction, the particle size of the materials involved in the reaction also has strict requirements, which requires that the circular vibrating screen can be accurately selected and adjusted according to the process requirements to meet the needs of different chemical processes.
Circular vibrating screen selection in different industries requires comprehensive consideration of various requirements, only according to the specific characteristics of each industry, accurate selection, in order to make the circular vibrating screen to play the best performance.
