What is the “equivalent screening” of ore?

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The sieving process is unbalanced. The “difficult sieving particles” pass through the sieve hole slowly, and the fine granules pass through the sieve. Due to this imbalance, the sieve production efficiency can be improved by increasing the mesh size and reducing the sieving efficiency. . For example, short head cone crushers and screens closed configuration when crushing hard ore crusher fixed discharge mouth 10 mm, there are two different screening examination working system: ① L 10 mm sieve, sieved total The efficiency is 85%; 2 mesh is 12 mm, and the total screening efficiency is 65%. In fact, the undersize products obtained under these two working conditions have equivalent specific surfaces, ie the same average particle size (Tables 2-5), that is, the undersize products are "equivalent" to the mined ore. , also called "equivalent screening."

It can be seen from Table 2-5 that under the second working system, there is not much +10 mm in the sieved product, and the fine fraction of 2.5 to 0 mm is increased compared with the first working system. Due to the increased fine fraction, the average specific surface area of ​​the undersize product increased by 3% over the first working regime.

The production capacity of the grinding machine will be the same under the two working systems of the sieve, and even increase in the second working system, so the quality of the sieved products under these two working systems is equivalent. However, under the second working system, the production capacity of the sieve will be greatly improved due to the increase of the sieve L and the reduction of the total screening efficiency. Therefore, the number of sieves installed can be reduced. Therefore, the sieve size of the general inspection sieve is always 20% to 30% larger than the maximum particle size limit of the mill, and the total screening efficiency is reduced to 65% to 60%.

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