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Nov 27 2019 · Ball mill is a key mineral processing machine for milling the materials into powders after they are crushed it has wet and dry type. It is widely applied to the production of cements silicate

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Procedures for Systematic Start up and Stoppage of Ball Mill we will discuss the systematic procedure for starting a Ball mill for taking into operation as well as stopping the Ball mill for taking out of circuit in Alumina refinery. Ball mill is one of the very critical equipment installed in Alumina refinery. thus the starting torque

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Procedures for Systematic Start up and Stoppage of Ball Mill we will discuss the systematic procedure for starting a Ball mill for taking into operation as well as stopping the Ball mill for taking out of circuit in Alumina refinery. Ball mill is one of the very critical equipment installed in Alumina refinery. thus the starting torque

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8.1.3 Power drawn by ball semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential features of a model for mill power. The torque required to turn the mill is given by Torque T Mcgdc T f (8.9) Where Mc is the total mass of the charge in the mill and Tf is

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Since the mass of the rotating cylinder with liners and balls is very high thus the starting torque for the mill is enormously high. The drive motor for the Ball mill ranges fro 0.5 MW to 2.5 MW depending on the hardness of Bauxite feed size and operating capacity of the mill for meeting the hourly alumina production requirement as described

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A typical relationship of motor power/torque output M1 with mill speed is illustrated for a nominal (or rated) motor speed equivalent to 72 CS. Examples of the power requirement developed by a mill charge as mill speed increases have been added for a 10 v/v ball charge at different total mill charge volumes ranging from 15-30 v/v.

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This is why a re-torque is specified and is usually carried out (mostly seen on liner bolts) but what about the bolts holding the mill together All to often they are just overlooked and the results can be seen above.When the mill finally goes into operation the structural bolts on mills are exposed to extreme loads during operation and after a period of time they start to relax and loosen

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converter based drive systems provide benefits that improve the ball mill operation. FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting. A squirrel-cage motor or a synchronous motor started direct on line without any help of a frequency converter normally cannot produce sufficient starting torque.

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the mill supplier. Ball mill torque curve - Cascading point is at 60° independent of speed. Figure 2 The torque speed characteristic curve for a recent ball mill is shown in Figure 2. Mill suppliers define the starting torque at an angular displacement of the charge. The cascading point of this mill is at angle of 60°. This implies that a

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The starting torque characteristic of this type of ball mill is not linear. Figure 2 shows the graph of mill speed versus torque requirement Figure 2 The graph clearly shows that the torque requirement exceeds 120 at 80 speed. This is why the starting torque of the drive motor should be at least 130 of full load torque.

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8.1.3 Power drawn by ball semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential features of a model for mill power. The torque required to turn the mill is given by Torque T Mcgdc T f (8.9) Where Mc is the total mass of the charge in the mill and Tf is

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converter based drive systems provide benefits that improve the ball mill operation. FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting. A squirrel-cage motor or a synchronous motor started direct on line without any help of a frequency converter normally cannot produce sufficient starting torque.

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