Although dry self-grinding and wet self-grinding differ, the working principle is basically the same. They all require stable ore supply (maintaining the material filling rate); the size of the block is proportional to a certain proportion (proportion); the material is raised to a certain height by the rotation of the cylinder, and then thrown down to produce an impact And grinding causes the ore to be ground.
The chart below shows the movement of the ore in the self-grinding mill . From the cross section of the self-grinding machine, it can be divided into a crushing zone, a grinding zone and a waterfall zone. Due to the classification of the nuggets in the movement of the self-grinding machine, the ore trajectories of different blocks are also different. The bulk ore is in a rotating inner layer (near the center of the mill) and is substantially plunging to form a crushed and ground area. Its cycle is short, and it quickly falls to the lower part of the cylinder, and the impact of the nugget falling from the waterfall is broken into smaller ore. Medium and small nuggets lift heights higher than large ones, and are thrown off the barrel and form a waterfall area. In the waterfall area, the inner layer to the outer layer of the ore block gradually become smaller (ie, the nugget at the highest point is the smallest, and the nugget at the lowest point is larger). The falling nuggets in the lower part of the cylinder and the self-grinding machine give new opportunities. Crush it. The ore block has the strongest impact crushing effect in this area, so it is called the crushing zone. After the ore is ground to a certain size in the crushing zone and the grinding zone, it is taken out by a gas stream or water to be classified.
The main force types of the crushed ore inside the self-grinding mill can be divided into: the impact force when the ore is free to fall; the mutual frictional force between the particles and the instantaneous stress of the ore from the sudden change of the pressure state to the tension state.
Under the condition that the specification and speed of the self-grinding mill are fixed, the feed amount (filling rate) of the material and the ratio of the size of the ore block directly affect the grinding process. The material feed rate determines the level of the material in the self-grinding machine. The production practice proves that the material filling rate is between 30% and 40%. If the ore control is not good, the level of the material in the self-grinding machine will fluctuate, which may cause the phenomenon of “flatness†(when the material level is too high) or “empty belly†(when the material level is too low). The stability of the ore supply includes two aspects: one is that the quantity is basically unchanged; the other is that the particle size ratio is striving for stability. Otherwise, only the quantity is stable, but the particle size ratio is improper, and the production will not be normal. Mainly because the large ore is not small, in some cases, when the large ore is insufficient, a small steel ball can be added instead. The general size accounts for 50% each, but the appropriate particle size ratio of each mine should be determined according to the experiment.
The self-grinding machine has a rotation rate of 70-80%, a crushing ratio of 100-150, a feeding particle size of up to 1000 mm, and a grinding to -200 mesh or fine.
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