The sieving process is unbalanced. The "difficult to sieving particles" pass through the sieve holes slowly, and the fine particles pass through the sieve holes. Due to this imbalance, the sieve size can be increased by increasing the mesh size and reducing the screening efficiency. productivity. For example, when the short-head cone crusher and the sieve constitute a closed-circuit crushing medium hard ore, the crusher has a fixed discharge port of 10 mm. There are two different working systems for inspection and screening: 1 sieve hole is 10 mm, and the total screening 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 in the second working system, 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 opening 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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