Raw milling Question 14

What is the best method to charge a ball mill ?

The normal method to charge balls into the ball mill is to position the doors at the top of the mill and remove them. Then to pour the barrels of grinding balls into the mill using an overhead crane. The exact grading of media required is identified by performing an axial test taking samples along the axis of mill. You want the desired fineness to be reached at the exit of the mill and adjust the ball grading to achieve this. For a new mill you need to rely on the experience of the commissioning engineer to determine the initial ball grading. It is normal practice to begin commissioning with only 65 per cent of the balls in the mill and bring this up to target by additions with monitoring between additions by axial testing.

We are analysing particle size distribution of raw meal, coal mill product and cement mill product through CELAS PSA having facility to determine 0.7to 400 micron.
Q1. what is the best particle distribution (on various micron sizes) of raw mill in terms of best mill performance, burnability and kiln performance and which plant in the world is producing?
Q2. what is the best particle distribution( on various micron sizes) of coal mill in terms of best mill & kiln performance? Our coal ash is 28. Q3. what is the best particle distribution( on various micron sizes)of cement mill product to have optimum power consumption, best strength &good performance in concrete.