High-frequency fine screen operation in grinding graded closed circuit system

In the multi-stage grinding operation of the plant, the classification of grinding can be completed by a variety of equipments, which is a good effect of high-frequency vibrating fine screening, or a hydrocyclone is superior, and there has been controversy in the industry. In the second-stage grinding grading, the ball mill and the cyclone constitute a simple closed-circuit process of pre-inspection and grading, and it is changed to the grinding, grading and concentrating multi-purpose closed-circuit process of grinding-high-frequency vibration fine grading-concentration magnetic concentrating.

The original two- stage grading equipment was changed to a cyclone. Due to the grading of the cyclone, the overflow was rough and the underflow was enriched, resulting in poor grinding performance in the second stage. Comparing the experimental results from the cyclone and the high-frequency fine screen, it can be seen that: compared with the two devices, the cyclone-0.074mm accounts for 75-80%, and the concentrate grade is 65.5%-66%. On this basis, the magnetic separation is filtered. Increase by 0.7%, concentrate grade reached 66%-66.7%. The high-frequency vibration fine sieve-0.074 accounts for about 65%, and the concentrate grade is 66.2%-67.8%. On this basis, the filtration magnetic separation is increased by 0.7%, and the concentrate grade is guaranteed to be above 67%.

The high-frequency vibrating fine screen is used instead of the cyclone. According to the principle of high-frequency vibrating fine screen strictly according to the geometrical size classification, the disadvantages of the cyclone running from the overflow and the anti-enrichment are overcome. The classification efficiency increased from 35% to 75%. At the same time, in the concentrated magnetic separation before the second grinding, the concentration of the fine sieve is 52%. In order to ensure the concentration of the second grinding ore is about 70%, the sieve must be concentrated and magnetically selected and then fed into the second stage. Grinding. In order to realize the grinding, grading, grading, concentrating and concentrating of the grinding-high-frequency vibrating fine grading-concentrating magnetic separation, the closed circuit process is multifunctional. Increase productivity iron ore processing equipment as a whole.

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