How to understand the "high concentration, large returning sand, and all-mineralization" in the operation of the grinding machine?

The mass fraction ( pulp mass fraction ) is the percentage of the ore mass ( dry weight ) in the pulp and the total mass of the pulp ( ore + water ) , where the mass fraction refers to the mass fraction of the slurry ( grinding mass fraction ) in the mill . Grinding mass fraction is an important factor affecting the productivity of the mill. It determines the friction between the grinding media and the material to be milled, the fluidity of the slurry and the effective density of the medium ( difference between medium and pulp density ) . 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. 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. However, the mass fraction of pulp is too high. Due to the increase of pulp density, the effective density and activity capacity of the grinding media will be weakened. At the same time, the mass fraction is high, the viscosity is high, the fluidity is deteriorated, and the total discharge capacity is reduced, which will lead to the grinding machine. Productivity is reduced, and even “ bloating ” is prone to occur . Therefore, “ high concentration ” means that the grinding quality fraction is appropriately increased within a certain range, which is advantageous for improving the grinding effect.

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 sand return ratio. Practice has proved that the size of the sand return ratio will directly affect the mill productivity. The larger returning sand ratio increases the grouting speed of the mill 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 a coarse 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 increase the mill productivity. Figure 16 shows the relationship between the sand return ratio and the relative productivity of the mill. It shows 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 the increase of the productivity when the certain value is reached, 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. Return ratio and relative productivity

All of them are mines. There are two main implications here: one is that the rate of feeding (the amount of minerals fed into the mill per unit time ) is constant; the other is that the grain size of the ore is uniform. 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 " inflated belly " will appear . Therefore, the silo should be used as much as possible to feed the mine.

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