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Design Method of Ball Mill by Discrete Element Method The physical constants used in these calculations are given in Table 1. In a discrete element method simulation of the inside of a ball mill, the coefficient of friction of the balls is the most important factor, and it has been

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AG/SAG mills in the data base are up to 40ft in diameter and ball mills are up to 26ft in diameter. The measured gross power draws from these mills are plotted against the model predictions in Figure 1. As indicated by this data base the accuracy of the model (1 standard deviation) is 4.6%.

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The design of a ball mill can vary significantly depending on the size, the equipment used to load the starting material (feeders), and the system for discharging the output product. The size of a mill is usually characterized by the ratio length to diameter and this ratio most frequently varies from 0.5 to 3.5.

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Ball mill . A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.It works on the principle of impact and attrition size reduction is done by impact as the balls drop from near the top of the shell.

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the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 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

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The torque and time requirements of the mill with the ball charge will set the magnitude and time of the inrush current during mill starting. The inertia for this mill reflected to the motor shaft is calculated to be 24,300 ft lbs2.

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PROCESS DIAGNOSTIC STUDIES FOR CEMENT MILL OPTIMISATION CASE STUDY V.K. Batra*, D. Bhaskara Rao** and Raju Goyal*** Empty heights of both the chambers measured to calculate the ball charge, % filling and estimate the power production is obtained from a ball mill when the mill motor power is at a maximum and consequently the specific

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In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize just in case. Well, this safety factor can cost you much in recovery and/or mill liner wear and tear.

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A ball mill is one kind of grinding machine, and it is a device in which media balls and solid materials (the materials to be ground) are placed in a container. The materials are ground by moving the container. Because the structure of ball mills is simple and it is easy to operate, and so they are widely used.

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Ball Mill Power Calculation Example 1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing 188; inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns).

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Nov 12, 20130183;32;it is a monochamber mill designed to grind the roller press product. if we calculate the shaft power with 28% filling it comes to more than 2600 kw with 210 t grinding media. also 28% filling do not corresponds to 180 t media , it is more than 210 t. supplier has given a ball mill motor installed

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Calculation of the power draw of dry multi compartment ball mills 229 In order to design a ball mill and to calculate the specific energy of grinding, it is necessary to have equation(s) law which relates mill power and mill size and mill operating conditions.

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A motor exerting a high torque is more expensive to build than a motor with normal exerting torque. Motors rated 1200 rpm can be built also with low inrush currents. In this case a solid pole construction is employed. Typical efficiencies of ball mill motors are between 96.5% to 96.8% at full load.

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Dec 12, 20160183;32;Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size

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Mar 31, 20080183;32;Answers. Modern installations draw power of 2 10 MW. The power (in kW) required to turn a ball mill is approximated by P = 0.285 d (1.073 j) m n where d is the internal diameter in metres, j is the fraction of the mill volume occupied by media, m is the total mass of media in the mill, in tonnes,

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