Molybdenum powder is a rare metal powder, and molybdenum powder is widely used in industries. Small-size molybdenum powder particles are easy to form enrichment and bridging phenomena, which is what we often say that molybdenum powder has "adhesiveness". When this type of molybdenum powder is sieved through vibro sifter, it is easy to form a dense adhesion state and block vibration. The sieve hole reduces the penetration rate. Agglomeration means that molybdenum powder particles form larger particles through surface tension or solid bond bridging, that is, agglomerates. The particle appearance of agglomerated molybdenum powder is irregular, which seriously affects the penetration rate and product quality of vibro sifter.
In view of the above situation, the selection of vibro sifter suitable for screening molybdenum powder should start from the following aspects:
1. The vibro sifter can prompt the molybdenum powder particles to move quickly along the screen surface to improve production efficiency.
2. The vibro sifter can ensure that the fine particles of molybdenum powder passing through the sieve have sufficient contact opportunities with the sieve surface.
3. The vibro sifter can prompt the molybdenum powder to turn strongly and help it to penetrate.
4. The vibro sifter machine can effectively prevent the agglomeration of coarse molybdenum powder particles and help fine molybdenum powder pass through.
The currently applicable vibro sifter for sieving molybdenum powder can meet the normal operation of the screening process, but it is inevitable that materials will be mixed and unevenly fed during the operation, which will affect the screening efficiency of the molybdenum powder. In addition, the flying of materials easily leads to environmental pollution and reduced recovery rate. In the screening process of small particle size molybdenum powder or large mesh screen, there will be too many times of cleaning, adhesion and blockage, etc., which increases labor intensity at the same time. Effectively improve the situation of material flying.
Therefore, in order to improve the screening efficiency and product quality of vibro sifter, and to minimize the clogging of the screen, the manufacturer of vibro sifter recommends the use of ultrasonic vibro sifter to screen molybdenum powder.
Ultrasonic vibro sifter can not only improve the accuracy and efficiency of molybdenum powder screening, reduce the cleaning time, but also eliminates the need to install a cleaning device, reducing the pollution of the powder by auxiliary cleaning devices such as bouncing balls. The ultrasonic vibrating screen passes through the 18Khz attached to the screen. The ultra-high frequency mechanical vibration force is as high as 36,000 times per second, which can effectively decompose adhering substances, break up agglomerated molybdenum powder, reduce the content on the sieve, and can maintain the size of the sieve, prolong the service life of the sieve, and stabilize the sieve Sub-accuracy.
Experiments have proved that the molybdenum powder is sieved with an ultrasonic vibro sifter equipped with a 280-mesh screen to meet international export standards, and the average yield can reach 86.5%. And after being judged by a professional tap density tester, after screening, the sum of the ratio of the contents on the vibrating screen is about 1‰ on average, which is much higher than the qualified requirement of less than 5‰ for the contents on the sieve. This means that the existence of ultrasonic vibro sifter greatly reduces the labor intensity of employees, reduces environmental pollution, and improves screening efficiency and product quality.
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