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Ball mill frequently asked questions

Ball mill frequently asked questions



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1.What is the technical efficiency of the grinding machine?

Answer: It refers to the ratio between the content percentage of the qualified particle size in the product obtained after grinding and the original content percentage of the ore that is greater than the qualified particle size.

2. What is qualified grade?

Answer: The so-called qualified particle size means that the upper limit of the particle size should be less than the specified maximum particle size, and the lower limit of the particle size should be minus the over-crushed part.


3. What is the passing capacity of the mill? How to calculate it?

Answer: The passing capacity of the grinding mill refers to the total amount of ore that can pass through per unit time. The calculation method is: q=Q(1+c)V where: q passing capacity of the grinding mill, tons/m³ hour. Q Calculate the productivity of the grinding machine based on raw ore, tons/hour. C sand return ratio, measured in multiples. Effective volume of V grinding machine, m³.

4. Briefly describe the process of crushing ore by ball mill?

Answer: When the mill rotates at a certain speed, centrifugal force is generated, causing friction between the medium and the cylinder. When it rotates with the cylinder, when it reaches a certain height and the centrifugal force is strong due to its own gravity, it is ejected from the cylinder and falls. Crush the ore. At the same time, due to the sliding phenomenon inside the medium, the ore also has a grinding effect. Under the impact and grinding force of the medium, the ore is crushed.

5. What are the movement trajectories of the medium in the ball mill?

Answer: There are three types of motion trajectories: ①. Falling type (during low-speed operation); ②. Dropping type (during normal speed); ③. Centrifugal operation (the movement trajectory of the medium and the cylinder is consistent).


6. What is the movement pattern of the medium in the ball mill?

Answer: There are mainly four points as follows: ①. When the mill operates at a certain speed, the medium makes regular cyclic motion under the action of centrifugal force and gravity; ②. The movement trajectory of the grinding medium in the cylinder is determined by It consists of upward movement in a circular arc trajectory and downward movement in a parabolic trajectory; ③. The rising height of each layer of medium is different. The height of the medium from the outermost layer to the innermost layer decreases in sequence; ④. The rotation period of each layer of medium is different. The closer to the inner layer, the shorter the rotation period.

7. What are the components of a ball mill?

Answer: It mainly consists of six parts: cylinder part, ore feeding part, ore discharge part, transmission part, bearing part and lubrication system.

8. What are the components of the ore feeding part?

Answer: The ore feeding part is composed of the end cover of the hollow journal, the ore feeder and the inner sleeve of the journal.

9. What are the types of mineral feeders?

Answer: There are three types of feeders used in ball mills in mineral processing plants: drum, volute and combined feeders.

Ball mill frequently asked questions
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