### Modelling of the HighEnergy Ball Milling Process

Highenergy ball milling is a compli ed process employed in solid reactions for obtaining nanostructured materials in powder form with an average particle size of less than 100 nm. The planetary mill is one of highenergy ball mills which is used for efficient and precision milling.

### O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE REQUIRED

characteristics of the ball mill discharge. Considering the Bond energy law and the correction factors by Rolland the total specific energy E req required for comminution of mineral from the initial size F 80 coarse crushing discharge to the final size P 80 ball milling discharge in the conventional circuit is found as follows: E req 4

### The energy efficiency of ball milling in comminution

If the energy to produce new surface by singleparticle breakage is used as the basis for evaluating efficiency then the efficiency of ball milling has a more realistic value of about 15 for the comminution of quartz and sodalime glass. In a second approach comminution efficiency is based on comparing the energy to produce some size

### The energy efficiency of ball milling in comminution

In terms of this concept the energy efficiency of the tumbling mill is as low as 1 or less. For example Lowrison 1974 reported that for a ball mill the theoretical energy for size reduction the free energy of the new surface produced during grinding is 0.6 of the total energy supplied to the mill setup.

### MODELING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP

Ball mill power draw predicted from the Denver slide rule kW 0 200 400 600 Calculated ballmill power draw from the m odel derived kW Data compared Line yx Fig. 2. Comparison of the ball mill power draw from the Denver slide rule and the proposed model. Dashed line corresponds to yx.

### AMIT 135: Lesson 7 Ball Mills and Circuits Mining Mill

Ball Mill Design. A survey of Australian processing plants revealed a maximum ball mill diameter of 5.24 meters and length of 8.84 meters Morrell 1996 . Autogenous mills range up to 12 meters in diameter. The lengthtodiameter ratios in the previous table are for normal appli ions. For primary grinding the ratio could vary between 1:1and