Ball mill method of calculating the ratio of the lot, generally easy to accept that feed size correlation method . Ie the composition of feed particle size , so that the diameter of each ball with a mass fraction of grain to feed the corresponding yield considerable level . There are other methods such density , mass method geometric diameter , surface area , etc. , mass geometric surface area method , the number of such method . The method is simple , easy to use , various methods are also significant differences. Linear superposition principle : According to this principle and grinding kinetics experiments can be obtained at any feed size distribution and ball size and the ratio of the product plus size requirements under . Practice has proved that this method is the most effective way of Ball Mill      size and ratio calculations. Exact makeup ball method Kunming University of independent research and development . Grated part of the compound will not yield , net , converted the remaining material to be ground -level grain yield . The use of ball diameter semi-theoretical formula to calculate the size of each grain size suitable for the ball , and then based on feed size correlation method to determine the proportion of the ball , the last ball by large proportion of the principles to be adjusted slightly . To verify the reasonableness of the ratio , generally located four early ball program : Recommended scheme , larger programs , small programs expand laboratory and field test programs and make appropriate adjustments , draw the best ball mill industrial program . Ball mill calculation formula: media ratio ( mass ratio ) of the general formula : Q1/Q2 = K (D1/D2) n, wherein Q1, Q2 , respectively coarse and fine level of quality of the ball , kg; D1, D2 were coarse and fine levels of ball diameter , mm; n, k is the correction factor . When two or more sizes of grinding media mix , as long as n, k remains unchanged , the same can thus calculate the ratio of various sizes media mill .