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Ball mills are a very common grinding equipment in mineral processing applications. In grinding, the ball mill takes on the heavy responsibility of grinding. If there is a slight error, the consequences will be very large. So, is there a need to emphasize the operation method of the ball mill grinding operation as the central link? Here, Shuguang Heavy Industry believes that as long as you master the nine-word secret of “all ore, large returning sand, high concentration”, you can achieve the most ideal grinding effect.
What is “all mines”? In fact, there are two main implications here: one is that the ore size is uniform; the other is that the ore rate (the amount of grinders fed into the mill per unit time) is constant. In order to improve the grinding efficiency, the ore supply should be continuous, uniform and stable at a high level. For a long time, the mass fraction in the mill will fluctuate frequently, which is not conducive to the grinding process. Grinding feedstock tends to have particle size segregation in the silo - the middle is fine, and the surrounding coarse is easy to cause uneven composition of the feed. If it can not be adjusted according to the particle size, the "flatness" will appear. Therefore, the silo should be used as much as possible to feed the mine.
Then the meaning of "great returning sand" is also very simple. In order to explain such benefits, first of all, let us first talk about what is returning sand. Back sand refers to the coarse-grained grade that is returned to the grinding machine by the classifier when it is closed. The amount of returning minerals is often several times that of the original ore. The ratio of the amount of sand returned to the amount of ore delivered is called the return sand ratio. Practice has proved that the size of the sand return ratio will directly affect the productivity of the mill. The larger returning sand ratio increases the grouting speed of the grinder due to the increase of the total ore supply of the grinder, and the residence time of the material in the grinder is shortened and the cycle is accelerated. In addition, although the sand returning is coarse-grained ore, it is finer than the original ore, so the grain size composition of the mill is fine, and the comprehensive result is beneficial to improve the productivity of the small ball mill. By studying the relationship between the return sand ratio and the relative productivity of the mill. It can be known that within a certain range (such as between 100% and 500%), with the increase of the sand-return ratio, the productivity of the mill increases with a certain value, the productivity increase is small, and the mill is fully fed. Through the ability, it is easy to cause the ball to swell. Therefore, the sand return ratio should be kept stable and close to a constant value.
The so-called “high concentration”, the grinding mass fraction is an important factor affecting the productivity of the grinding machine. It determines the friction between the grinding medium and the material to be ground, the fluidity of the slurry and the effective density of the medium (the difference between the medium and the pulp density) ). At the same time, the amount of ore per unit volume in the ore discharge is large, so the amount of ore discharged is large. In the operation of the mill, a higher grinding mass fraction is generally used, so that a layer of pulp can be attached to the surface of the medium to enhance the abrasive effect on the grinding. Therefore, "high concentration" means that the grinding quality fraction is appropriately increased within a certain range, which is advantageous for improving the grinding effect.
As long as you master the above-mentioned ball mill operating specifications, or learn from the experience of the predecessors, you can let the ball mill work under the best working conditions. The core issue exposed by the nine-character secret is the balance between input and output efficiency.
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