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For example using the cyclone overflow p80 size of 150 mesh 106 m for reference he observed that the percentage of 150 mesh material inside the ball mill increased from 55 to 71 as the circulating load was increased from 160 to 500that meant that the ball mill was expending 71 of its power on the coarse 150 mesh size material at the high clr vs 55 of its power grinding 150 mesh
Ball mill special design to ball mill which will be selected on the basis of hardness grindability index of material to be ground feed size particle size and hourly capacity customized to the liner selection of grinding ball and rod can improve grinding efficiency farthest
The closed circuit ball mill with size classification after milling figure 1 is common for primary ball mill applications while classification of fresh feed before milling figure 2 is more commonly used for secondary ball mill applications the relative capacity as function of circulating load and classification efficency for secondary
A ball mill critical speed actually ball rod ag or sag is the speed at which the centrifugal forces equal gravitational forces at the mill shells inside surface and no balls will fall from its position onto the shell the imagery below helps explain what goes on inside a mill as speed varies use our online formula the mill speed is typically defined as the percent of the theoretical
May 30 2016 the variation of a with ball diameter was found to be of the form a k2d15 both k1 and k2 vary with mill diameter and simple power laws have been assumed k1 d01 k2 d06
Circulating load effectthe effect of circulating load on grinding circuit capacity was recognised many years ago in a report published in 1925 edward w davis from minnesota school of mines first demonstrated the fundamental relationship between the new feed rate and the circulating load in a closed grinding circuit
Jun 18 2019 the grinding medium can also be used in steel sections the size of the selected steel ball is generally large usually 40mm 60mm etc bead mill the grinding media of the bead mill generally uses zirconia beads zirconium silicate beads or glass beads which are selected according to different abrasive materials used by different manufacturers ele bead mill adopt high wearresistant alloy steel as the grinding material its hardness can reach hrc62 so our company bead mill
Now the relationship between types of ball mill and grinding conditions will be introduced briefly below the type of ball mill is related to the water content of ore for the type of mqg dry grid ball mill water content of ore should be controlled strictly before grinding
Ball mill special design to ball mill which will be selected on the basis of hardness grindability index of material to be ground feed size particle size and hourly capacity customized to the liner selection of grinding ball and rod can improve grinding efficiency farthest
Jun 18 2009 there is a relationship between size of particles and size of balls in any cases the lifting effect on the ball is greatest at the greatest diameter and the larger balls will be most effective in size reduction of this point cutway of ideal operation of conical hardinge ball mill 52
11 morrell s 2004 predicting the specific energy of autogenous and semiautogenous mills from small diameter drill core samples minerals engineering vol 173 pp 447451 12 morrell s 2004 an alternative energysize relationship to that proposed by bond for the design and optimisation of grinding circuits
Most important force in grinding friction why impact force is not efficient in grinding narrow size distribution present top layer acts as shield difficult to crush fine particles coarse grinding 100 passes through 10 mesh 165mm fine grinding 95 passes through 200 mesh 74 micrometers
12003000 ball mill cylinder speed is 36r min ball loading is 35t feed size 25mm the finished size is 007404mm the motor power is 37kw the weight is 128t the per hour capacity is 165t
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