There are two types of fixed sieves: grid sieve and strip sieve. The sieve is mostly used for the ore mine or the upper part of the coarse crushed mine silo. It is used for controlling the ore size. It is generally installed horizontally. The sieve is mostly used for pre-screening before coarse or medium crushing, and the sieve hole should generally not be less than 50mm. The strip screen installed in front of the crusher acts as a trough at the same time, and its inclination angle is generally 40°~50°. If the ore contains a lot of water, the dip angle can be increased by 5°~10°.
Fixed strip sieve area
Where A - the sieve sieve area, m 2 ;
D——the size of the sieve mesh, mm;
q——Importing the amount of minerals, t/h;
q 0 ——1mm mesh width fixed strip sieve unit area treatment amount, t/(m 2 h·mm),
See Table 1.
See Table 1.
After calculating the sieving area, the sieve width is determined according to the maximum particle size of the ore, which is generally 2.5 to 3 times the maximum grain size of the ore. Calculate the length of the sieve according to the screening area and width, generally 2 to 3 times the width. When determining the width and length of the screen, it is necessary to pay attention to the width and configuration of the ore feeder and crusher.
Table 1 1mm sieve hole width fixed strip sieve unit area processing amount q 0
Screening efficiency /% | Screen gap / mm | ||||||
25 | 50 | 75 | 100 | 125 | 150 | 200 | |
q 0 /t·m -2 ·h -1 ·mm -1 | |||||||
70~75 55~60 | 0.53 1.16 | 0.51 1.02 | 0.46 0.92 | 0.40 0.80 | 0.37 0.74 | 0.34 0.68 | 0.27 0.54 |
Note: The unit area treatment amount q 0 is calculated according to the ore looseness of 1.6t/m 3 . When the ore looseness is different, it needs to be corrected.
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