There are many factors that determine the production capacity of tube mill. Only when we understand these factors can we better solve the problem. What are the factors that affect the production capacity of tube mill?
1. Factors of the tube mill itself
(1) type
The productivity of wet mill is higher than that of dry mill.The production capacity of rod mill is higher than that of ball mill.
(2) diameter and length
The production capacity of large-diameter mill is high, and the power consumption of powder mill is low (because the ratio of the weight of the cylinder to the weight of the mill is small, the work required to overcome the friction is less).Long too short, product fineness difficult to meet the requirements, long too long, increase power consumption, and produce more over grinding phenomenon.The length-diameter ratio of cement industry tube mill is 3 ~ 6.
(3) lining plate type and arrangement
The production capacity of the mill is higher when the capacity of the liner is larger.When the grading board is installed, the grinding body in the mill is positively graded, which is beneficial to the improvement of production capacity.When installing the groove lining plate, the steel ball can play the impact grinding function better and the production capacity of the mill is higher.
(4) compartment plate and feeding and discharging device
The shape, width and effective section area of the grate in the compartment plate are reasonable, and the mill has a high production capacity when it is suitable for the structure of the inlet and outlet devices.
(5) speed
The speed of cement industry tube mill is about 76% of the critical speed.The production capacity can be improved by proper increase of rotating speed, but the power consumption of pulverization will not decrease obviously.Too high rotating speed will cause the vibration of the grinding body intensified, grinding body and lining plate wear increased, the operating rate decreased, resulting in a decline in production capacity.
(6) ventilation
When the ventilation inside the mill is good and the wind speed is appropriate, the productivity of the mill is high.Closed circuit is generally 0.3~0.7 m/s, open circuit is generally 0.5~1.2 m/s.
2. Material factors
(1) hardness of materials
The greater the hardness, the worse the frangibility, the lower the productivity of the mill.
(2) granularity
The larger the feed size, the longer the grinding time to the required fineness, the more power consumption, the lower the production capacity of the tube mill.
(3) water content:
the total water content of grinding materials should be about 1.0%.High water content, the steam in the mill can not be discharged out of the mill, easy to paste the ball and lining plate, the production capacity of the mill decreased;Too high, the grate will plug and cause "full wear", or even make the mill unable to run.
(4) temperature
When the temperature of the grinding material is high, the powder material with electrostatic adsorption and agglomeration, the production capacity of the tube mill decreases.When it is too high, the "ball bag" phenomenon will occur.
(5) product fineness
When the product fineness is too fine, the grinding time to the qualified fineness is too long and the grinding phenomenon is intensified, and the production capacity of the mill is significantly reduced.
3. Feeding operation
When the feeding amount is appropriate and even and stable, the ball material ratio is maintained in the mill, and the production capacity of the tube mill is high.
4. Grinding method
Closed-circuit grinding is more productive than open-circuit grinding.It is also a closed circuit powder mill, with a high efficiency concentrator than with centrifugal and cyclone thing concentrator production capacity is high;The reasonable selection of parameters such as cyclic loading rate is higher than the production capacity when it is not reasonable enough.
5.Five other
Mill load control device can increase mill output.The output of mill with pre-crushing equipment is higher than that without.
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