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Ball Mill

SAMAC is a professional mining equipment manufacture.

Ball mill is vital equipment in industries viz. mineral dressing, ore processing, fertilizers, food and diary, pharmaceuticals and many others. The present work involves a meticulous study of the effect of the various parameters on the performance of a ball mill.

The parameters studied in this work are particle size, number of balls, time of grinding, particle density, and speed of the ball mill (rpm). An attempt has been made to develop correlation for the performance of the ball mill by correlating these variables with the grindability on the basis of dimensional analysis approach as well as fractional factorial design method. It is observed that these parameters influence the performance of the ball mill significantly. The performance of a ball mill is measured with reference to the quantity of undersize or fines (amount of grounded material passing through120 mesh screen) per revolution of the mill, collected for variation of each of the individual parameters.

Finally the calculated values of the fines in terms of the grindability of the mill obtained through the correlations by both the above-mentioned methods are compared with the experimental values thereby justifying the analysis with reasonable deviations. Thus the developed correlations can be applied to know the grindability of the Ball Mill over a wide range of parameters.

Ball mills are used primarily for grinding various ores and other materials. They can be either dry or wet designs according to the customers.
Ball mills are sized from 2 t/h to 30 t/h for wet grinding and from 0.5 t/h to 30 t/h for dry grinding. They have been designed in standard sizes of the final products between 0.074 mm and 0.4 mm in diameter. So, ball mills are suitable for general mining applications such as ore dressing of ferrous metal and non-ferrous metal, quarry applications, glass ceramics, etc.

Ball Mill Manufacturers

Experimental work conducted in our laboratory and supplemented by our pictures in slow motion definitely indicates that the action inside the Mill drum is not a haphazard stirring and throwing of the charge.

There is a specific operating speed for most efficient grinding. At a certain point, controlled by the Mill speed, the load nearest the wall of the cylinder breaks free and it is so quickly followed by other sections in the top curves as to form a cascading, sliding stream containing several layers of balls separated by material of varying thickness. The top layers in the stream travel at a faster speed than the lower layers thus causing a grinding action between them. There is also some action caused by the gyration of individual balls or pebbles and secondary movements having the nature of rubbing or rolling contacts occur inside the main contact line.

It is important to fix the point where the charge, as it is carried upward, breaks away from the periphery of the Mill. We call this the “break point”, or “angle of break” because we measure it in degrees. It is measured up the periphery of the Mill from the horizontal.