How to choose grinding media for ball mill?

During the use of the ball mill, the choice of grinding media is crucial. The grinding media is influenced by various factors such as material, loading amount, shape, and particle size. In the grinding process, according to different materials, models, and equipment, using different grinding media can reduce production costs and increase production efficiency. Then how to choose grinding media for ball mill? 1. Density, hardness, size of grinding media The larger density of the grinding media, the shorter grinding time. In order to increase the grinding effect, the hardness of the grinding media must be greater than the hardness of the material being ground. According to long-term experience, the Mohs hardness of the media is better than the hardness of the material being milled by more than 3 levels. In addition, the smaller the size of the grinding media, the greater the number of media contact points and the greater chance of grinding the material. 2. Media loading The amount of loading has a direct influence on the grinding efficiency, and the size of the grinding media determines the loading of the grinding media. It must be ensured that when the grinding media moves in the disperser, the porosity of the media is not less than 40%. For different fineness requirements, it is necessary to adjust the ability of the grinding media to crush and grind. The filling rate is high and the grinding ability is strong. On the contrary, the crushing ability is strong. In the case of ultrafine grinding, a high filling rate is generally used. 3. Material Abrasive materials determine the cost of crushing and crushing efficiency. Abrasive materials can be mainly divided into metal media, rock mineral materials and non-metallic materials. In addition to considering the production cost, it is also necessary to consider whether the materials and media will cause pollution. Commonly used grinding media are steel balls, alumina balls, zirconia balls, etc. 4. Shape and size Grinding media are generally more spherical, because other irregularly shaped media will wear out and cause unnecessary contamination. The media size directly affects the grinding efficiency and the fineness of the product. The larger the diameter, the larger the particle size of the product and the higher the yield. Conversely, the smaller the particle size of the media, the smaller the particle size of the product and the lower the capacity. Actual production generally depends on the feed size and the required product fineness. 5. Media ratio In general, in the continuous grinding process, the size of the grinding media is distributed in a regular manner. The media size ratio is directly related to whether the grinding ability can be exerted and how to reduce the media wear problem. In the process, the fixed media ratio will not always be maintained, and in the production, large balls are used to restore the grinding of the system. It is difficult for the mill to maintain a constant media ratio for a long time. When the difference in the diameter of the media is too large, the ineffective grinding between the media is exacerbated and the cost of the grinding process is increased. It is necessary to find a suitable proportion in the production process according to the type of material and the characteristics of the process, and remove the media that is too small in time to reduce the cost. 6. Abrasion resistance and chemical stability Abrasive wear resistance and chemical stability Wear resistance is an important condition for measuring the quality of grinding media. Non-wear-resistant media need to be replenished due to wear. This will not only increase costs, but more importantly affect production. The grinding media needs to have a certain chemical stability in the specific grinding process, and cannot react chemically with the material during grinding, causing pollution to the material.