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The newly installed ball mill has a running-in process. During the running-in process, the amount of steel balls is added for the first time, accounting for 80% of the maximum ball loading of the ball mill. The proportion of steel balls added can be according to the size of the steel ball (Φ120mm, Φ100mm, Φ80mm, Φ60mm, Φ40mm) size added. Different ball mill models have different ball loadings. For example, the maximum loading capacity of the MQG1500×3000 ball mill is 9.5-10 tons. The first addition of steel ball (120mm and 100mm) accounted for 30% -40%, the middle ball 80mm accounted for 40% - 30%, and the small ball (60 and 40mm) accounted for 30%.
Why is the ball mill ball volume only 80% added during the ball mill running-in process? After the ball mill is installed, the ball mill size gear needs to be meshed, and the processing capacity should be gradually increased. After the ball mill runs normally for two or three days, check the meshing of the large and small gears. Wait until everything is normal, open the ball mill manhole cover and add the remaining 20% steel ball for the second time.
The addition of the small steel ball is only the first time the ball is added. Because, when the ball mill is in normal operation, the reasonable friction between the steel ball and the steel ball, the steel ball and the ore, the steel ball and the ball mill liner will increase the wear, make the big ball grind and the middle ball grind into a small ball. Therefore, under normal circumstances, there is no need to add a small ball. In the case of adding a small ball, there is no monomer dissociation at the useful mineral particle size, and when the fineness of the mill is not up to the flotation requirement, an appropriate amount of small balls can be added. In the ball mill, the steel ball wears continuously during the operation. In order to maintain the ball filling rate and the reasonable ratio of the ball, and to maintain the stable operation of the ball mill, it is necessary to carry out reasonable ball filling and low compensation.
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