How to control grinding fineness

Effective control of grinding fineness is an important factor in directly reducing costs and improving economic efficiency. First of all, we must fully understand the influencing factors of grinding fineness.

1. Hardness of the mine: It can be rationally blended, and the ore size can be made as uniform as possible, and the ratio of bulk 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.

2, crushing particle size, grid sieve hole: the ball miller must supervise the crushing system, if the size of the ball mill in the production of the ball mill changes, it must be immediately reflected to the crushing plant. The final requirement is that the finer the particle size, the finer the better.

3, ball mill model, speed, ore amount, number of steel balls, steel ball size: pay attention to the consultation at the time of purchase.

4. Lifting height of the grader spindle: After the equipment maintenance of some ore dressing mills, the ore in the classifier is not cleaned up. Under the long-term sinking, the mud sink is more solid, when the grader spindle is lowered, due to Not careful, did not completely lower the spindle, 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.

5. Blade wear: After the blade is worn, the amount of sand returned 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.

6. 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, can grader welding two edges of a certain height angle iron, wooden pull plug method to adjust the level of the classifier overflow weir, sometimes after long-term accumulation of sludge, can naturally raise the height of the overflow weir.

7. 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: on-site production 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. Well, while the workers are not paying attention to the operation process, the invisible also affects 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.

8. Water flow at the returning sand: In many domestic mines, the grinding automation is not realized. The amount of water is directly adjusted by the ball miller. Because the water flow in these two places is large, it is difficult to see the increase and decrease. Careful observation and subtle adjustments must be required.

9. Ball mill water supply size: The ball mill water supply increases, the grinding concentration becomes thinner, and the grinding fineness will become thicker. On the contrary, the ball mill water supply decreases, the grinding concentration becomes larger, and the grinding fineness becomes finer.

10. The size of the flushing water at the discharge port of the ball mill: 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. Under the premise that the grinding fineness is guaranteed, the ball mill can be greatly increased.

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