Tips For Improving The Fineness Of The Ball Mill

Tips For Improving The Fineness Of The Ball Mill

Tips for improving the fineness of ball mill grinding

The grinding cost is a higher part of the ore dressing plant. How to effectively and reasonably control the grinding fineness is an important factor that directly reduces the cost of mineral processing and improves the economic benefits of the plant. Because the grinding fineness is one of the many factors affecting the mineral processing index, the size of the grinding fineness directly affects the level of the concentrate and the recovery rate of the product. Therefore, the technical operation of the ball miller is important. First of all, we must fully understand the influencing factors of grinding fineness. In summary, the factors affecting the fineness of grinding are: raw ore hardness, crushing particle size, sieve mesh, feed amount, ball mill model, number of steel balls, steel ball size ratio, ball mill liner wear, ball mill speed, grading Machine speed, grader spindle lift height, classifier blade wear, grader overflow height, classifier lower opening height, classifier lower opening size, classifier upper opening height, classifier upper opening size, return sand flow size, ball mill The size of the water supply, the size of the water at the discharge port of the ball mill, etc.

Understand all of these influencing factors, we need to find one by one in the production operation to find the best adjustment factor. Raw ore hardness: different ores, the hardness is not the same, this factor is fixed relative to the same ore, and can not be adjusted. However, in the production, under the premise of the technical requirements of the beneficiation process, reasonable ore distribution can be carried out, and the ore size can be made as uniform as possible, and the ratio of the block and powder minerals is reasonable and stable. In addition, in the belt of the ball mill belt, the belt may leak due to long-term wear, and most of the leakage is powder ore. This part of the mine must be added to the ball mill as soon as possible. If it is stacked for a long time, it will be concentrated. Adding will cause uneven grinding of the ball mill and cause unstable production. Especially difficult to mine, often the properties of powder minerals and block minerals are not the same. The height of the grader's main shaft is also an important factor affecting the amount of sand return and the fineness of grinding. Normal normal production requires the grader spindle to be in place. Some ore dressing mills have not cleaned the ore in the classifier after the equipment has been overhauled. Under the long-term sinking, the mud sinks more. When the grader spindle is lowered, the spindle is not completely lowered because it is not careful. , resulting in less sand than normal. In addition, if the spindle is not lowered, it may be because the spindle has not been cleaned and oiled for a long time, so pay attention to it during the operation.

The size of the crushed grain and the adjustment of the sieve mesh are closed. The ball miller must supervise the crushing system. If the particle size of the ball mill changes during production, it must be reflected to the crushing workshop immediately. The final requirement is that the finer the particle size, the finer the better. Blade wear of the classifier: After the blade is worn, the amount of sand return is reduced, resulting in coarser grinding fineness. In addition, if the blade is worn out, it will affect the life of the classifier. Therefore, the blade wear condition should be checked in time and replaced in time. Wear the blade. Ball mill speed, classifier speed, classifier impeller spacing: fixed at the time of purchase of the ball mill, pay attention to the consultation at the time of purchase.

Grading machine

The level of the overflow of the classifier affects the size of the sedimentation area of ??the ore. In the production, we can adjust the level of the overflow of the classifier according to the requirements of the fineness of the grinding. If the fineness of the grinding is required to be fine, The angle iron of a certain height is welded on both sides of the classifier, and the height of the overflow weir is naturally increased by the method of inserting the wooden board to adjust the overflow of the classifier.

The height of the opening under the classifier, the size of the opening under the classifier, the height of the opening on the classifier, and the size of the opening on the classifier are on-site during the installation of the equipment. In many factories, because the size of the opening of the classifier is not adjusted during the installation of the equipment, The workers did not pay much attention to the operation process, and the invisible also affected the grinding operation. The lower opening of the classifier is relatively large, so the sedimentation area of ??the ore is larger, so the amount of sand returned will be larger, the fineness of the grinding is relatively fine, and the opening under the classifier is large. The sedimentation area of the ore is larger, the water flow is more gentle, so the amount of sand returned. It will be large, the grinding fineness is relatively thin, the opening on the classifier is low, the amount of sand returned is relatively large, the fineness of grinding is relatively thin, the opening on the classifier is large, the relative amount of sand returned is relatively large, and the fineness of grinding is relatively thin. Otherwise the opposite.

First of all, we have to assume that all other influencing factors are normal. The principle is: in the case of a certain fineness of grinding, we must maximize the amount of processing, which can effectively improve production efficiency. (Most of the ore, except for special minerals) Relatively speaking, the finer the fineness of grinding, the more sufficient the dissociation of useful minerals and gangue minerals is, and it is beneficial to improve the recovery rate of metals, so under the condition of processing the ore amount , as much as possible to improve the fineness of grinding. In addition, grinding is the first step in the beneficiation process. In order to ensure the stability of production, the grinding should be as stable as possible. In the case of a certain amount of ore, the size of the flushing at the discharge port and the size of the ore directly affect the fineness of the grinding.

In many domestic mines, the grinding automation is not realized, and the amount of water is directly carried out by the ball miller. Manual adjustment, because the water flow in these two places is large, it is difficult to see the increase and decrease, so careful observation and fine adjustment must be required. First of all, we understand that the ball mill water supply increases, the grinding concentration becomes thinner, and the grinding fineness becomes coarser. On the contrary, the ball mill water supply decreases, the grinding concentration becomes larger, and the grinding fineness becomes finer. The flushing water at the discharge port of the ball mill becomes larger, the overflow becomes thinner, and the overflow fineness becomes finer. On the contrary, the flushing water at the discharge port of the ball mill becomes smaller, the overflow becomes thicker, and the overflow fineness becomes thicker. Therefore, in other conditions, including the same amount of minerals, to improve the fineness of grinding, the ball mill water supply can be reduced, and the flushing water at the ball mill discharge port is increased. It is best to adjust these two conditions at the same time to ensure The fluctuation of the flotation is caused by the change in the amount of the ore caused by the adjustment of the fineness of the grinding. In many factories, due to the operation of the ball miller, the amount of ore is greatly changed, resulting in instability of the flotation liquid level. If the flotation worker does not process it in time, the metal recovery rate and grade change are caused. The opposite is true if the fineness of the grinding is coarsened.

Under the premise of grinding fineness guarantee, the amount of ore given by the ball mill can be increased. The size of the ore is given to meet the grinding fineness requirements, while the ball mill does not swell. The entire process must be carried out in detail in all aspects.

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