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First, how to judge
How much steel ball has a close relationship with the magnitude of the main motor current. Experienced mill miners are constantly watching the changes in the ball mill's main current while the ball mill is running.
In the case that the ball mill does not change the amount of ore and the working condition is good, generally speaking, the higher the current, the more the ball mill loads the ball; otherwise, the less.
Through long-term experimental observation of the Φ3600×4000 wet lattice ball mill, the author knows that the synchronous motor with the ball mill has a voltage of 6000 volts, an alternating current frequency of 50 Hz, a power of 1100 kW, and a rated current of 125 amps. When the motor is idling, the current is 0; when the motor drives the ball mill, the current is 25A when the air load is running; when the ball grinding is 60t/h, the ball loading is 60t, the synchronous machine current is 85A; when the ball mill feeds the same amount, the steel ball When the increase is 5t, the current increases by 4A; when the amount of ore is increased by 5t/h, the current increases by 5A.
Second, how to add
Ball mill plus ball after new installation or overhaul: The newly installed ball mill liner has a running-in process. The amount of steel balls added for the first time accounted for 80% of the total ball loading. Different types of ball mills have different ball loading numbers and steel ball sizes. For example, the maximum ball loading of MQG1500×3000 ball mill is 9.5~10t, the first ball is 7.5~8t, and the remaining steel ball is added after 3~4 days of driving. The weight ratio of ball is Φ100 mm, 40%. Φ80 mm accounts for 30%, Φ60 mm accounts for 15%, and Φ40 mm accounts for 15%. The maximum ball loading of MQG3600×4000 ball mill is 70t, the first time is 56t, and the remaining 3~4 days later, the ball loading ratio is Φ120 mm, 40%, Φ100mm, 30%, Φ80mm, 15%, Φ60mm. 15%. Generally speaking, the ball mill has a diameter of 2500 mm or more. The specifications and proportion of the first ball are Φ120 mm, 40%, Φ100 mm, 30%, Φ80 mm, 15%, and Φ60 mm, 15%. For ball mills with a diameter of less than 2500 mm, the first ball loading is Φ100 mm for 40%, Φ80 mm for 30%, Φ60 mm for 15%, and Φ40mm for 15%.
After the ball mill is running normally, the diameter of the additional steel ball is: for the ball mill with a diameter of 2500 mm or more, the supplementary ball is Φ120 mm; for the ball mill diameter less than 2500 mm, the additional steel ball is Φ100 mm.
According to the quality of the steel ball, in general, 0.8 to 1.8 kg should be added for each ton of ore processed.
(Expert Zheng Guangyu Hu Jiyou )