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The main types of forged ball and rolling ball are high carbon CR-Mo Alloy and medium and low carbon manganese alloy. The process of forging ball and rolling ball is simple and the manufacturing cost is low, considering economic benefit, the low chromium alloy grinding ball is generally used in mine wet process, and its abrasion in iron ore, copper mine and molybdenum ore is about $number. Improving the hardness of low chromium alloy ball is the most effective way to reduce abrasion. The carbon content of the forged ball is generally around 1%, and chromium is less than 2%. Low chromium casting ball hardness generally should be around HRC45, should be as far as possible to improve the low chromium cast iron ball hardness, in order to improve economic efficiency.
The diameter of the grinding ball is generally not greater than φ60mm. Cement and mine shall be graded according to the diameter of the mill, the surface shape of the liner and the size of the incoming material. The principle of gradation is only one: as far as possible to reduce the diameter of the ball mill, because the ball mill is grinding machine, if it is to bear the crushing effect even if only a small part of it is very inappropriate.
Ball Mill steel balls loss and many aspects are related, such as steel ball size, steel ball movement form, steel ball ratio, select the appropriate parameters can greatly reduce the wear of steel ball. Generally in accordance with the actual work experience, a warehouse grinding due to the size of the ore, so in the mill should be the main impact, the size of the steel ball should be increased. The grain size of the two warehouses is finer, the mineral stress should be mainly abrasive, and the steel balls should be reduced as far as possible. Furthermore, the ball load has a certain effect on the abrasion of steel ball, when other conditions are certain, the ball-loading rate increases in a certain range, which will improve the grinding effect, and the grinding effect is the best when the ball-loading rate reaches 50%. In addition, steel ball wear is also affected by the speed of the mill, with the increasing speed of grinding machine, steel ball movement from diarrhea to drop, when the speed is certain, there is a maximum diligence rate, and then the mill speed increase, will make the steel ball centrifugal movement, not to grinding effect.
