An Effective Method To Reduce The Wear And Tear Of Grinding Media Balls in Ball Mills

The varieties of forged balls and rolled balls are mainly high carbon chromium molybdenum alloys and medium and low carbon manganese alloys. Forging balls and rolling balls have simple processes and low manufacturing costs. Considering economic benefits, mining-type wet processes generally use low-chromium alloy grinding balls, and their wear in iron ore, copper ore, and molybdenum ore is generally about 500-700 grams. Increasing the hardness of low-chromium alloy balls is the most effective way to reduce wear. The carbon content of forged balls is generally about 1%, and the chromium content is less than 2%. The hardness of low-chromium cast iron balls should generally be around HRC45, and the hardness of low-chromium cast iron balls should be increased as much as possible to improve economic benefits.

The diameter of grinding balls in thermal power plants is generally not larger than φ60mm. Cement and mines should be graded according to the diameter of the mill, the surface shape of the liner and the particle size of the feed. There is only one grading principle: reduce the diameter of the grinding ball as much as possible, because the ball mill is a grinding machine, it is very inappropriate to rely on it to undertake even a small part of the crushing effect.

The loss of steel balls in a ball mill is related to many aspects, such as the size of the steel balls, the form of the steel balls, the ratio of the steel balls, etc. Choosing the appropriate parameters can greatly reduce the wear and tear of the steel balls. Generally, according to the actual work experience, due to the large particle size of the ore feeding in the first warehouse, the impact force should be the main force in the grinding drum, and the size of the steel ball should be increased. The particle size of the second warehouse grinding is relatively fine, and the force of the mineral should be mainly grinding, and the size of the steel ball should be reduced as much as possible. In addition, the amount of ball loading also has a certain influence on the wear of steel balls. When other conditions are constant, the ball loading rate increases within a certain range, which will improve the grinding effect. When the ball loading rate reaches 50%, the grinding effect is the best. good. In addition, the wear of steel balls is also affected by the rotational speed of the mill. With the gradual increase of the rotational speed of the mill, the movement of the steel balls changes from falling to falling. The centrifugal movement of the steel ball will not achieve the grinding effect.