ball or tube mill,24, 1931 united states patent office ball ob tube hill application filed december 9, 1929, serial no. this invention relates to ball or tube mills..ball and tube mill opn,increase the loading of other mill suitably. maintain the unit load according to situation and take other action required for unit stability. continue with this till mill .basic ball mill grinding circuit,grinding coarse ore in a ball-mill is done by steel balls of three sizes (5, 4, and 3 inches); fine ore is ground in a tube-mill by 2- and 1-inch balls .small ball mills for sale,ball mills of greater length are termed tube mills, and when hard pebbles rather than steel balls are used for the grinding media, the mills are known as pebble .
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