Mar 08, 2013· calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account.

The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5 x 20 with a ID of 16). This example shows that Mill 2 is slightly more efficient than Mill 1 even though it has a higher power

The mill used for this comparison is a 4.4 meter diameter by 13.6 meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 s.ton per hour. This type two compartment mill is a state of the art shell supported cement finish mill. The torque and time requirements of the mill with the ball

4. Ball mill rotating speed: when grinding ball adding rate remains constant, the useful power of ball mill varies with the rotating speed, therefore, production efficiency will also be influenced. Ball mill rotating speed need to be adjusted according to different types of ores. If the motor power is large enough, increasing rotating speed

Vertimill® has an excellent turndown ratio and can be operated at lower than installed power with less effect on grind efficiency than for example horizontal ball mills. Feed Flow Rate. This parameter is used in conjunction with the feed density and motor power to establish the grinding rate in kWh/mt.

In order to get the most economical consumption of power, the ball load in a Hardinge Mill should be kept up to the level of the trunnions. The capacities, power requirements, etc., of the various sizes of Hardinge Ball Mills are given in Table 12. It should be noted that the two figures describing the size of a mill represent the diameter of

A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power.. The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The following shows how the size or select the matching mill required to

GROSS POWER CALCULATOR General The model predicts the gross power, which is also called the motor input power. This is not the same as the so called power at pinion, which is slightly lower than the gross power and relates to the power as base are up to 40ft in diameter and ball mills are up to 26ft in diameter. The measured gross

Several types of ball mill drives can be furnished, made up of various combinations of gearing, motors and transmission equipment. The correct combination to be selected takes into consideration power requirements, gear ratings, floor space, interference from other plant equipment and motor characteristics. The main types are described and illustrated on these pages.

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