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1.DGS the high frequency vibrating screen a fine screen is fine Dagushan beneficiation plant developed, in October 1988 by the national patent, the structure detailed in Figure 1.
The working principle of the DGS type high frequency vibrating fine screen is shown in Fig. 2, which is similar to the self-flow type vibrating fine screen, which is different from the general screening machine. The slurry is uniformly fed into the sieve surface at a certain angle (generally 45 degrees to 60 degrees) through the feeding port. Since the sieve bars are arranged horizontally, the slurry flow is not fed vertically, but is perpendicular to the sieve. During the process of slurry flowing through the screen surface, gravity stratification occurs due to the action of gravity and high-frequency vibration force, which is beneficial to enrichment and classification. The fixed screen strip produces a mechanical "cutting" effect on the flowing pulp, and the "cut" pellets become undersize products, and the "cut" pellets become screened products. At the same time, the high-frequency shock force also produces a linear vibration of throwing and falling at a frequency of 1/50 s, which is more conducive to the "cutting" effect and prevent the screen hole from being blocked. Due to the above working principle, the size of the undersize particles is not equal to the size of the mesh, but approximates its horizontal projection. Therefore, a large sieve can be used to obtain a small undersize product, or the same sieve can be used to change the sieve angle. And get the product at the desired screen level. Straight line high frequency vibration not only prevents clogging of the screen hole, improves the screening efficiency, but also reduces the screen surface wear.
The characteristics of DGS type high frequency vibrating fine screen are: the equipment is simple in structure, convenient in installation and maintenance, no transmission parts, no lubrication, low operating cost and reliable production. When sieving fine-grained grade, the sieve hole is not easy to be clogged, the sieve surface wear is small, the screening efficiency is high, and the power consumption is small.
The performance of DGS type high frequency vibration fine screen technology is shown in Table 1.
Application: After the successful development of 1DGS high-frequency vibrating fine screen in September 1984, the Dagushan Concentrator will use this fine screen designed and manufactured by itself to treat the two-stage grinding cyclone grit, so that the classification efficiency is The original 42% increased to about 63%, the secondary cycle load decreased by 30% to 50%, and the grade of grinding ore was reduced by 10%, basically overcoming the problems in the second-stage grinding circuit. The re-election workshop of Gongchangling Concentrator of Anshan Iron and Steel Co., Ltd. successfully used this method to control the grain size of the spiral chute, and stabilized and improved the grade and recovery rate of iron concentrate. 2In 1988, the magnetic separation workshop of Dagushan Concentrator was used for expansion. The screen replaced the hydrocyclone for the second stage of classification and success; 3 Angang Steel Changling Concentrator in the re-election workshop and magnetic separation workshop technical transformation, from 1986 to 1987 to the Dagushan Concentrator purchased 22 sets of high Frequency fine screen, in the fine screen re-grinding circuit instead of vibrating fine screen and hydrocyclone, realizes two-stage ball mill to one two-stage ball mill process, so it can save electricity and reduce steel ball and liner consumption. The benefit is about 500,000 yuan; 4 Jiugang concentrator also purchased this high-frequency fine screen to improve the grade of iron concentrate; 5 in Liaoning a small magnetic separation plant for magnetic separation fine screen self-circulation process, making iron The concentrate grade is over 66%.
2. GPS type high-frequency vibration fine screen The fine screen was successfully developed by the Changsha Research Institute of Mining and Metallurgy in the early 1980s, similar to the American Derrick fine screen.
The structure of the high-frequency fine screen is shown in Fig. 3. It is mainly composed of a vibrator, a slurry distributor, a feeder, a screen frame, a frame, a product collecting device, a suspension spring, and a laminated screen.
The sieve surface of the fine sieve is composed of three sections, and each section has the same length and width. Each section of the screen is individually fed and the screening and discharge operations are completed independently. The sieve surface is composed of three layers of stainless steel wire mesh screens with different pore diameters. The uppermost layer is the main screen and the sieve hole is the smallest. The second layer is the anti-blocking screen. The sieve hole is larger than the sieve hole of the first sieve. A sieve sequence, the third layer is a support screen, the sieve hole should be as large as possible, but it must have sufficient rigidity and strength, and the upper two layers of the screen should not be uneven due to the excessively large wire diameter, thereby reducing the service life. The screen is mounted on a bracket with a certain curvature (Figure 4).
Developed by the vibrator is used, the appearance of elongated cylindrical shape having a length equal to the width of the screen frame, the outer surface of the aluminum alloy has many fins. A three-phase AC excitation motor is mounted in the middle of the long cylinder, and a pair of vibrators are arranged at both ends of the motor shaft. The pair of vibrators are composed of a weighted block and a biasing block. By changing the angle between the biasing block and the biasing block, the magnitude of the exciting force can be changed, thereby changing the amplitude. The bearings at both ends of the vibrator are lubricated with dry oil, which is convenient for refueling. The vibrator is directly mounted above the middle of the screen frame, and the screen frame is directly driven for vibration. The screen frame is suspended in a state in which four rubber springs are fixed to the bracket by screws.
The slurry distributor is similar to a cyclone without a overflow pipe at the flat bottom, and divides the slurry fed into the tangential direction into three paths, and respectively feeds three ore feeders, and simultaneously delivers the slurry to the three-stage sieve surface. The ore feeder consists of a halving plate, a grading tank and a porous rubber plate, and the slurry can be gradually and evenly fed to the sieve surface. While the screen moves together with the screen frame for circular motion and elliptical motion, there is relative movement between the three layers of screens, that is, due to the different tension of the screen, there is a very small up and down flapping between the screens. Movement and lateral movement, thus accelerating the grading of the material according to the particle size, and making the difficult-to-screen material easier to pass through the sieve hole or extruding the granule into the sieve product, so the sieve hole is not easy to block, which increases the effective efficiency in the screening process. The area of ​​the mesh. Furthermore, once the slurry is applied to the sieve, it is in close contact with the sieve surface at the feed end, and rapidly becomes a thin layer uniformly distributed along the sieve surface, and the material at the feed end is subjected to the elliptical movement of the peak downward due to the sieve surface. Acceleration, the material at the discharge end decelerates due to the upward elliptical motion of the screen surface, which creates favorable conditions for screening materials and improving screening efficiency. The on-screen products of the first two sections of the screen are discharged through the discharge hopper on the screen frame to the discharge pipe fixed on the receiving hopper, and the products on the sieve of the latter section of the sieve are directly discharged into the receiving hopper, and the sieve of the three sections of the sieve surface The lower products are directly discharged into the large hopper.
Another feature of the high-frequency fine screen is that due to the use of a laminated screen and a large slope (27 degrees), large sieves can be used to screen small materials, and the mesh size of the main screen can be larger than the graded particle size by 0.6. Times around. The disadvantage is that the strength and wear resistance of the screen are poor, the structure of the equipment is relatively complicated, and the operation and maintenance are inconvenient.
The GPS high-frequency vibrating fine screen developed by Changsha Mining and Metallurgical Institute is leading in China in the key technology of vibrating fine screening, “continuous operation capability of high-frequency vibrator†and “suspension support of rubber spring†(good vibration isolation, no need for concrete foundation). Level, its series of products have been promoted and applied in more than 420 sets of non-ferrous mines, black mines, building glass sand production, metal powder preparation, deep processing of mineral products, etc. It is an effective equipment for screening and classifying fine-grained materials.
Main features: 1 stable and reliable high-frequency vibrator that can run continuously; 2 high vibration times, low amplitude, can effectively reduce the surface tension of the slurry, which is conducive to the separation and stratification of fine and heavy materials, speeding up fine and heavy The material is permeable, and the product under the sieve is positively enriched; 3 multi-way feeding, high utilization of sieve surface; large processing capacity and low power consumption; 4 rubber spring support screen frame, vibration isolation, low noise, equipment The dynamic load is small, no concrete foundation is needed; 5 polymer wear-resistant sieve plates or stainless steel laminated screens can be selected according to requirements.
Scope of application: 1 Iron ore (Qintie) concentrator: instead of vibrating fine sieve, curved sieve, cyclone, etc., used for iron concentrate control and classification. Due to the high efficiency of high-frequency vibrating fine screening, the positive enrichment effect of the products under the sieve is remarkable; thus, the selected grades are improved, and the concentrate grade can be stably increased by 0.5% to 3% when the processing capacity of the mill is the same; The classification efficiency is improved, the useful mineral over-grinding is reduced, the average grain size of the concentrate is increased, so that the filtration condition of the concentrate is improved, the moisture content of the filter cake is reduced by 0.5% to 1%; 2 the tungsten, tin , antimony , molybdenum ore dressing plant: instead of the spiral Grading machine, cyclone grading, or combination with them, not only controls the selected particle size, but also effectively solves the brittle, large specific gravity of the monomer dissociated useful minerals in the grit. problems, can be significantly reduced over crushed useful minerals, mineral processing efficiency to improve the recovery rate of 8% ~ 15%; â‘¢ the glass material of quartz sand, feldspar ore dressing plant: a rod mill - screening process. Quartz rod grinding products are wide in size and angular, and are difficult to screen materials, but high-frequency vibrating fine screen can stably produce qualified products; 4 Kaolin concentrator: used to control the final product size or high gradient magnetic separator , sieve hole 325 mesh; 5 metal powder preparation; production of 400 mesh ~ 40 mesh metal powder.
The high-frequency fine screen has been industrially tested or produced in the following concentrating plants since 1983: 1 In the grinding and grading circuit of a section of the Xianghualing tin mine in Hunan, the fine screen is used instead of the price 00 spiral classifier, and the spiral The grader overflows for secondary grading and has achieved good results; 2 instead of vibrating fine screen in the ball mill circuit of the Bari tin mine in Guangxi Dachang Mining Bureau, replacing the spiral classifier in the medium mine regrind circuit, using Good technical and economic indicators have been obtained after high-frequency fine screening; 3 This fine mesh is used instead of curved sieve in the second-stage grinding circuit of Shougang Miyun Iron Mine, which can improve the processing capacity of the plant by 12.8% and the concentrate grade by about 1. %, significant economic benefits can be obtained.
The technical performance of the GPS type high frequency vibrating fine screen is shown in Table 2. Currently, South Mine and Saddle Heavy also produce this type of fine screen.
   Figure 1, 2    Figure 3, 4 Â
   Table 1       Table 2
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3. 4ZGS1020 high-frequency vibrating fine screen The fine screen is produced by the saddle mine, the movement track is straight, the screen surface is the braided screen, the whole screening process is in a sealed state, so the dustproof performance is good, mainly used for fine sand and so on. Grading of granular materials.
The high frequency fine screen has a low vibration frequency of 1500 times/min, a double amplitude slightly larger, 1 to 2 mm, a vibration direction angle of 45 degrees, and a motor of 1.5 kW. It has 4 layers of screen surface, each layer has an area of ​​1.93, and the mesh size is 10, 20, 40 and 60 mesh. The screen surface is installed horizontally without inclination; the feeding size is ≤10mm, and the processing capacity is 3t/ h; The external dimensions are 2509mm × 1620mm × 1420mm, the total weight is 1448 tons, and the maximum dynamic load is ±3500N. Its shape and installation dimensions are shown in Figure 5.
4. GYX type high frequency vibration fine screen This fine screen is the advanced equipment developed by Guangzhou Nonferrous Institute. Its structure is shown in Figure 6. It has the following characteristics: 1 large processing capacity and high screening efficiency; 2 fine separation size, Dry and wet screening particle size can reach 40μm; 3 high frequency, small amplitude; 4 vibration motor performance, long life; 5 multi-layer screen overlap technology, can effectively prevent screen blockage; 6 miner can evenly The slurry is fed into the ore feeder and evenly distributed on the screen surface; 7 using a special tool for replacing the screen, it is convenient and quick to replace the screen.
The fine sieve was used in Heishan Iron Mine of Chengde, Hebei Province in June 2003, which improved the grade of iron concentrate, with obvious economic benefits, and the process was simple and reliable. At the same time, the production application shows that the GYX31-1207 high-frequency vibrating fine screen has good mechanical properties, reasonable structure, simple structure and high screening efficiency. In addition, due to the special structure of the screen and reasonable design, it ensures that it is not easy to block and ensure high equipment. Screening efficiency and long service life.
The fine screen can be widely used in mining, coal, chemicals, building materials, light industry, food and other industries. The technical parameters are shown in Table 3. The external dimensions and foundation are shown in Figures 7 and 8.
5. Cone type high frequency vibrating fine screen The fine screen was developed by Tohoku University in 1985, its structure is shown in Fig. 9, and the technical performance is shown in Table 4.
The working principle is as follows: the material or slurry is sent from the feed bin 1 to the distributor tray 2, and then the feedstock is distributed to the sieve surface. Under the action of vibration force and gravity, the material moves along the curve on the sieve surface 3, and the fine particles partially pass through the sieve holes into the fine grain bin and are discharged from the lower discharge port 5. The cone type sieve has two sieve faces, and the sieve on the first sieve face is turned over once, and the sieve is continuously sieved on the second sieve face. Since the mesh size is slightly larger than that of the first sieve face, the sieve mesh size is slightly larger than that of the first sieve face. The critical particles can be fully permeable. The material on the second layer of the screen enters the outer ring conveying trough and is discharged from the discharge opening 4 to become a screened product.
The sieve test shows that the material can be loosely and stratified on the sieve surface due to the higher vibration times, and the sieve is twice sieved, so the screening efficiency is higher, generally above 80%.
6. Derrick Overlay High Frequency Vibrating Fine Screen is located in Drake Company, Buffalo, New York, USA. It has been engaged in the research and development and production of fine screens, screens and vibrators for more than 50 years. In recent years, wet fines have been introduced. The patented product of granule material screening—overlapping high-frequency vibrating fine screen (Fig. 10), provides grading equipment with large screening capacity, high classification efficiency and small footprint for industrial mineral processing, especially suitable for 6.3~0.038mm ( 400 mesh) Classification of materials. When used for the classification of iron ore 0.075mm (200 mesh), the screening capacity of a 5-way superimposed high-frequency vibrating fine screen is as high as 130t/h, and the screening efficiency exceeds 85%.
The key of Derrick's superimposed high-frequency vibration fine screen is the successful development of Derrick wear-resistant anti-blocking screen. Derek's patented wear-resistant anti-blocking polyester screen allows for grading from 6.3mm to 0.10mm with an open cell ratio of 45%. Compared with the traditional woven stainless steel screen, the service life is 20 to 30 times higher, and the difficult sieve particles that are not close to the sieve hole block the screen, and there is no paste hole phenomenon.
For the design and manufacture of wet grading fine screens, Derrick has for many years emphasized the importance of screening width in screening capacity and screening efficiency. The same screening area, a relatively long screen surface with a relatively wide screen surface, and a thinner and more uniform screening layer, resulting in greater screening capacity and higher screening efficiency. In order to achieve a grain-level penetrating screen that is smaller than the mesh, it is usually necessary to contain free water in the slurry and to impart a suitable vibration force. A 5-way feed of the fine screen is achieved through a slurry distributor. The overlapping high-frequency fine screen has a width of 1.2m and 1.4m for each feed. The same screen is installed for each feed to achieve specific grading requirements.
Two Drake powerful vibrators provide the vibration force of the 5-way superimposed high-frequency fine screen. The power of the vibrator is 1.86 kW (2.5 hp) or 3.75 kW (5.0 hp). Power consumption can be significantly reduced compared to conventional wet grading fine screens or other grading equipment. The Derrick vibrator provides uniform and efficient high frequency vibration for the entire width and length of each screen. The linear motion of the two vibrators is also a key factor in the performance of the fine screen. The specially designed feed box gives a thin and even slurry to the screen surface, which accelerates the movement under the action of linear vibration. This accelerated motion improves the grading effect. The linear motion conveys the product on the screen to the hopper on the screen. The appropriate number of vibrations, amplitude and vibration force should be selected to achieve the best screening effect.
Each screening unit has a lower screen receiving tray. The material from all of the undersize receiving trays is collected into a lower screen receiving chute. Similarly, the screened product of each screening unit is collected into a sieve receiving hopper. Thus, the upper and lower screen products have their own separate discharge openings. There is enough space between each screening unit for viewing and replacing the screen.
According to the user's screening capacity requirements, it can provide overlapping high-frequency fine screens for 1st, 2nd, 3rd, 4th and 5th feeding. In some special applications, one sieving machine can be used to achieve different grading requirements, as well as the most efficient screening method for repetitive pulping. Derrick has a high frequency overlay for iron fine sieve, kaolin, silica sand mine, phosphate ore, feldspar, different minerals Chin Grading hundreds. It has been used to provide the required particle size for flotation, spiral chute and gravity jigging. Derrick's superimposed high-frequency fine screen with high processing capacity, high screening efficiency, small footprint and low power consumption (3.75kW) can meet the classification requirements of various minerals.
Mineral samples should be provided to Drake's screening laboratory for industrial screening tests. The test allows the user to understand the screening effect of the overlapping high-frequency fine screen on the materials provided by the user, such as screening capacity, screening efficiency and non-blocking characteristics of the screen surface.
Shandong Laigang Lunan Mining Co., Ltd. iron ore dressing plant installed a Derick 5-way superimposed high-frequency fine screen at the end of 2003 (configure Derrick high opening ratio wear-resistant anti-blocking polyester screen and 7.3G strong all Closed vibrator), replacing the high-frequency fine screen with metal screen and nylon screen, used for three-stage grinding closed loop 0.lmm classification. On the basis of the expansion of a section of ore processing from 3 grinding series to 4 grinding series, due to the improvement of screening efficiency, reduction of over-grinding and selection conditions, the original three-stage grinding series of two mills Only one run is required, and the mill capacity is increased by 50%. The power consumption of the three-stage grinding is reduced from 20.2 kWh/t to 10.1 kWh/t. The annual electricity cost is 1.2 million yuan and the steel ball cost is 400,000 yuan. Reduce 4 operators. The output of iron concentrate has increased from 265,000 t/a to 330,000 t/a, and the economic benefits are very significant.
Derrick's superimposed high-frequency fine screen has been successfully applied to China, Brazil, Australia, the United States, Israel, Canada, Germany, Turkey, Kazakhstan and Russia, and has been well received by users.
   Figure 5  Figure 6  Figure 7  Figure 8  Figure 9  Figure 10
   table 3  Table 4
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