This article describes the use of ball mills and rod mills to improve the ball milling process, mainly through the comparison of the function and performance of the two mills, and then through the theoretical design of the ball mill and the use of the rod mill to make the ball mill To achieve high efficiency and optimize the grinding process, I hope that the majority of users in this article can try this method if the technical conditions permit. If it succeeds, it will bring a lot of benefits to the enterprise.

First, the use and performance of ball mill and rod mill

1, the performance of the rod mill

The name of the rod mill is no longer mentioned here. It is generally used as a wet overflow mill, which can be used for first-stage open grinding. It is mainly used in the primary grinding of artificial sand making, mining, chemical and electric power departments. mine.

The particle size characteristics of the rod mill discharge are related to the condition of the rod mill grindstone. When the steel bar hits the ore, it first grinds the coarse particles and then grinds the small ore particles, thus reducing the risk of over-grinding. When the steel bar rises with the lining, the coarse particles are sandwiched between them, and the fine particles pass through the gap, which is beneficial to the smashing of the coarse granules, so that the coarse granules are uniformly concentrated in the place where the grinding medium is hit. Therefore, the product of the rod mill is uniform and the powder is light.

Second, the use of ball mill and rod mill

1. When using the two-stage grinding process, if the first section is ground from 20 to 6 mm to 3 to 1 mm, when the first grinding equipment is used as the first grinding equipment , the production capacity is larger and the efficiency is higher. Since the bar-to-charge ratio of a certain weight is much smaller than the surface area of ​​the weight ball, the rod mill is less productive and efficient than the ball mill in the second stage of fine grinding.

2. In some cases, it can be used as a small crush instead of a short-head conical crusher. When dealing with softer or less hard ores [especially viscous ores], grinding a 19 to 25 mm [or even 32 mm] ore to a 6 to 10 mesh with a rod mill than with a short cone cone crusher When the screen is closed, the configuration is simple, the cost is low, and the dust removal in the crushing workshop can be simplified. For hard ore, it may be economical to use a short-head conical crusher and a screen to close the road. In the design, whether to use ball milling or rod grinding, we must make a comparison according to the specific situation to determine, you can refer to the previous article, when to use the ball mill, when to use the rod mill.

3, below the main bit tungsten, tin and other rare metals ore beneficiation: tungsten, tin and other rare metals of reselection or magnetic separation plant, in order to prevent excessive crushing hazards caused, often using rod mill; sieve into a closed circuit when the The configuration is simple, the cost is low, and the dust removal in the crushing workshop can be simplified. For hard ore, it may be economical to use a short-head conical crusher and a screen to close the road. Whether ball milling or rod grinding is used in the design must be compared according to the specific situation to determine.

Third, the use and performance of overflow and lattice ball mill

Let's talk about the differences in performance and use of overflow and lattice ball mills.

1. Advantages: The lattice ball mill is a low level of ore discharge. The pulp stored in the ball mill is less, and the finely ground ore can be discharged in time. Therefore, minerals with a large specific gravity are not concentrated in the ball mill, and the over-grinding is lighter than the overflow type, and the grinding speed can be faster.

2. Advantages: Because there are fewer pulps stored in the lattice ball mill, it is possible to load more balls, and it is easy to install small balls because of the grid blocking. When the steel ball is dropped, the effect of weakening the impact by the slurry resistance is also light, which makes it more productive and efficient than the overflow ball mill. Compared with lattice ball milling, the overflow ball mill has a small productivity of 10% to 25%, while the lattice ball mill consumes more power than the overflow type. Although the lattice ball mill has a large power consumption, 10% to 20%. However, due to high productivity, the efficiency index calculated by “ton kW·hour” may be higher. Because lattice type ball mills have these advantages over overflow type ball mills, some plants have converted the overflow type into a lattice type.

3. Disadvantages: Due to the simple structure of the overflow ball mill, the management and maintenance are more convenient, the price is lower, and it is better for the fine grinding than the lattice type, so there are many factories that use it. It can be considered that when it is necessary to grind the uniform coarse-grained product of about 48 to 65 mesh, the lattice type is preferable; when it is to be ground to a fine product of 150 to 200 mesh, the overflow type is preferably used, but this judgment remains to be determined. Production practices are further confirmed.

Therefore, the grinding process of the ball mill and the rod mill should achieve a multiplier effect through rationalized design, because the choice of grinding equipment depends on the hardness of the feed, the size of the discharge, the output and other factors to determine the choice of the model. In order to achieve the effect of high efficiency and energy saving, it can bring more benefits to the enterprise on the basis of meeting the production needs of the enterprise.

The above is compared with the use and performance of the ball mill and the rod mill, the use of the ball mill and the rod mill, the use and performance of the overflow type and the lattice type ball mill, and the process flow of the ball mill and the rod mill phase is introduced, and the enterprise wants to obtain For more benefits, it is recommended to try this grinding process.

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