DGS type high frequency fine screen
DGS type high frequency fine screen, obtained national patent in 1988, its structural properties are as follows. It has the following characteristics:   DGS type high frequency fine screen size type  number A B C D E DGS-4 1600 2000 2000 2400 2200 DGS-6 1600 2000 2000 2400 3000 DGS-8 1600 2000 2000 2400 3860 The slurry is uniformly fed into the sieve opening at a certain angle (typically 45 degrees to 60 degrees). Since the sieve bars are arranged horizontally, the slurry flow is not perpendicular to the sieve surface but perpendicular to the sieve. Movement, in the process of slurry flowing through the screen surface, due to the action of gravity and high-frequency vibration force, gravity stratification occurs, which is conducive to enrichment and classification. The fixed sieve strip produces a mechanical "cutting" effect on the flowing slurry, and the "cut" ore pellets become the undersize product, and the uncut "mineral" becomes the sieved product, and at the same time, high The frequency striking force also produces a linear vibration of throwing and falling at a frequency of 1/50S, which is more conducive to the generation of "cutting" and preventing clogging of the mesh. Due to the above working principle, the size of the undersize particles is not equal to the size of the mesh, but similar to its horizontal projection, a small sieve can be used to obtain a small undersize product, or the same mesh can be used to change the angle to obtain the desired sieve. The next level of product. [next]   Main technical performance of DGS high frequency fine screen type  number Sieve size Screen size Separation granularity Processing capacity Sieve angle Double sieve Vibration frequency Useful power Mm Mm t/å°Â·h t/å°Â·h degree degree Times / min kW DGS-4 1200 0.5 0.3 to 0.074 20~30 45~60 0.2 to 1 3000 0.45 400×( ) ×4 0.3 -1500 0.2 0.15 DGS-6 1200 0.5 0.3 to 0.074 30~50 45~60 0.2 to 1 3000 0.65 400×( ) ×4 0.3 -1500 0.2 0.15 DGS-8 1200 0.5 0.3 to 0.074 40~60 45~60 0.2 to 1 3000 1.5 400×( ) ×4 0.3 -1500 0.2 0.15 4. Application examples  Comparison of the effects of two grading devices Number of segments Year and conditions Grading efficiency, % Comprehensive screening Vibrating screen Cyclone One section Examination in 1981 44.61 　 44.61 Grading Examination in 1984 42.18 42.18 Second paragraph Screen hole 0.15mm 63.39 49.61 41.54 Grading Screen hole 0.2mm 63.62 47.3 40.98 (2) High-frequency vibrating fine screen replaced hydraulic cyclone In 1988, when expanding the production capacity of the magnetic separation workshop of Dagushan Concentrator, it was decided to use high-frequency vibrating fine screen instead of hydrocyclone for second-stage grading. ,feasible. The figure below shows the mass quality flow chart when the production capacity of the grinding and grading series is about 50t. In 1986, the Dagushan Concentrator made a full use of the ZCC cone magnetic separation tank, and cooperated with the high-frequency vibrating fine screen to cancel the hydrocyclone in the original process and redesigned the new process (below) for industrial test. The results of the production test proved that the two devices each played an advantage, so the screening quality of the new process was increased by about 3% compared with the original process (see table below). [next]  Comparison of original production process and test process indicators flow   Cheng Raw ore grade Concentrate grade Tailings grade Recovery rate % % % Production Process 34.03 60.88 8.36 87.49 Test procedure 33.83 64.65 9.48 84.35 (3) One-to-two-stage ball mill realizes two-to-one The original grinding classification process of Gongchangling Concentrator is the same as the grinding classification process of magnetic separation of Dagushan Concentrator. In 1987, the plant used high-frequency vibrating fine screen to greatly reduce the circulating load of the second-stage grinding. Therefore, the first and second-stage ball mills were two-to-one.
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1. Structure and characteristics The DGS high-frequency vibration fine screen structure is shown in the figure below. 
(1) Easy installation and maintenance, low operating costs.
(2) Using the working principle of vibrating fine screen, the nylon mesh is equipped with an electromagnetic high-frequency vibrator to generate the exciting force of linear vibration, so the mesh is not easy to be blocked when the fine-grained grade is sieved, the screen wear is less, and the sieve is divided. High efficiency and low power consumption.
(3) According to the user's requirements, we can design sieves with different inclination angles (maximum 60 degrees) and adjust the angles within small ranges (±5 degrees). The sieves can also be designed according to the processing capacity.
(4) The control device of the electromagnetic vibrator used in the screen adopts a thyristor half-wave rectification line, so in the course of use, the opening angle of the thyristor can be adjusted to adjust the amplitude to adjust the screening effect. Centralized control and automatic control of the process can be realized. [next]
(5) The electromagnetic vibrator for the screen can be frequently started and operated for a long time under the conditions of rated voltage and amplitude.
2. Working principle The working principle of DGS type high frequency vibrating fine screen is different from that of general screening machine. It is similar to the working principle of self-flow vibrating fine screen, as shown in the figure below, and its external dimensions are shown in the following table. Note: The above dimensions are suitable for a 56 degree inclination, 1200mm screen.
3. Main technical performance
The main technical performance of DGS type high frequency fine screen is shown in the following table.
(1) a fine sieve dither secondary grinding grit cyclone Dagushan beneficiation plant is a permanent secondary grinding machine, a ball mill and hydrocyclone semi-closed circuit composed of grinding and classification circuit. Since the grading equipment (hydrocyclone) is static pressure feeding, the ore pressure is insufficient, and there are three problems:
â‘ hydrocyclone has enrichment, iron grade sand is often higher than the overflow containing 6 to 10% grade.
2 The classification efficiency is generally 35 to 45%, and the highest is only 45 to 50%. There are still -200 mesh in the cyclone grit, accounting for 30 to 35% of the product entering the ball mill and grinding.
3 The cyclone concentration of the cyclone is low, only 60-65%, sometimes only 50-55%, which affects the improvement of the second-stage grinding efficiency. [next]
In 1984, the high-frequency vibrating fine screen was installed in the concentrating plant according to the magnetic separation 5 series two-stage grinding grading circuit shown in the figure below. Under the condition of similar capacity, the second-stage grading efficiency can be improved from about 42%. About 63%, the secondary cycle load is 30 to 50% lower. The grade of ore selected for the next sorting operation (overflow and undersize mixed product) is increased by about 3%. The results are compared in the table below.
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Since the first and second stage ball mills realize two-to-one, one second-stage ball mill is stopped, which can save electricity and reduce the consumption of balls and liners.
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