Choose a ball mill or a rod mill?

Grinding operation is very important in the entire beneficiation process, the cost is also quite large, the investment is huge and the energy consumption is high, therefore, choosing a suitable mill is very important for the entire beneficiation plant.

At present, ball mills and rod mills are widely used in concentrators. However, the difference in appearance between ball mills and rod mills is not very large, and it is not easy to distinguish. However, a careful comparison shows that the difference between the two is still very large. First of all, from the point of view of the name, the grinding medium of the ball mill is a steel ball, generally less than 100 mm in diameter, and the grinding medium of the rod mill is a steel rod, generally greater than 500 mm in length. The discharge methods of the two are also very different. The ball mill has two types of discharge methods: grid type and overflow type. Both have advantages and disadvantages. The rod mill has no grid plate, and mainly has overflow type and opening. Two types. Secondly, the filling rate of the grinding media is also different, that is, the percentage of the equipment volume occupied by the grinding media is different. If the filling rate is too high or too low, the final effect will be affected. Usually, the ball mill is 40%-50%, and the rod mill is 35%. -45% is the most ideal. The performance of the two equipment is also quite different. Due to the different media, the rod mill grinding media is in linear contact with the ore, which has a certain selective grinding effect, the product size is more uniform, and there is less over-grinding. The ball mill media and the ore are in point contact, which has impact and grinding power, and the product size is finer, but the over-grinding phenomenon is more serious. Finally, the scope of application of the two is also different. When heavy separation or magnetic separation of tungsten tin ore and other rare metal ores, rod mills are often used to prevent excessive crushing; in the second-stage grinding process, rod mills are generally used As the first-stage grinding equipment, it has larger production capacity and higher efficiency. When processing soft or not too hard ores, rod mills can be used to replace short-head cone crushers for fine crushing, which is not only simple to configure, but also low in cost, and simplifies dust removal in the workshop.

Because of the fine grinding materials, the ball mill is prone to over-crushing. It is not suitable for the gravity separation production line in metal beneficiation, but is widely used in other beneficiation processes.

Due to the difference between ball mills and rod mills, users can choose according to their materials, grinding particle size, production methods, etc. In contrast, the products of ball mills are finer and the products of rod mills are rougher but more uniform.