Ball Vs Rod Vs Roll Mills Gold Refining .apr 09, 2015 this type of mill is normally used as the first stage of a milling process to provide a reduced size feedstock for a further milling process. fig cross sections of a rod mill and a bar mill. ball mills. ball mill is same kind of mill as rod mill, except that it is filled with balls instead of rods. because of balls have greater ratiosend message
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