In the case of closed circuit crushing, the production capacity is calculated according to the amount of ore passed by the closed circuit breaker , and the calculation formula is as shown in 2-11: (2-11)
Q closed - the production capacity of the crusher in closed circuit, ton / hour;
Q open - the production capacity of the crusher, ton / hour;
K——The coefficient of the average grain size of the ore in the closed circuit. The medium or short cone crusher is generally selected according to 1.15~1.40 when the road is closed (the small value is taken when the ore is hard, and the large value is taken when it is soft).
2) The production capacity of the light facing roller crusher is calculated according to formula 2-12: (2-12)
Where Q is the production capacity of the roller crusher, ton / hour;
D——roller diameter, meter;
L——roller length, meters;
N——roller rotation number, transfer/min;
D——the maximum particle size of the crushed product, m;
δT——the true specific gravity of ore, ton/ m3 ;
K-- loose coefficients, typically selected from 0.1 to 0.3 (0.1 to take the metal ore, takes a large value when soft material).
3) The production capacity of the hammer crusher can be calculated according to formula 2-13: (2-13)
Where Z is the number of gaps in the discharge raft;
L - the length of the scorpion sieve, meters;
C——the gap width of the sieve grid, meters;
D——mining size, meter;
————Loose and discharge unevenness coefficient, generally take 0.015～0.07; small crusher takes small value, large crusher takes large value;
K——the number of hammer rows in the circumferential direction of the rotor, generally 3 to 6;
N——rotor speed, transfer/min;
δ - the ore pseudo-specific gravity, tons / m 3 .
4) The production capacity of the impact crusher is calculated according to formula 2-14: (2-14)
Where K 1 - the correction factor of theoretical production capacity and actual production capacity, generally takes 0.1;
C——the number of hammers on the rotor;
H——the height of the hammer, m;
A——the distance between the hammer and the counterattack plate, meters;
D—— emissions particle size, meters;
B——board hammer width, meters;
N——rotor speed, transfer/min;
δ - the ore pseudo-specific gravity, tons / m 3 .
3. Calculation of the number of crushers required (2-15)
Where n is the crusher that is designed for the design;
Q n - the design ore of the crushing operation; when the closed circuit is broken, according to the designed ore meter passing the closed-circuit crusher, ton / hour;
Q——The production capacity of the crusher, ton/hour.
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