with the installation of one or both of these machines between the ball mill and classifier, as high as 70 per cent of the free gold and sulphide minerals can be immediately removed, thus reducing grinding costs and improving over-all recovery. feeding a rod mill finer rocks will greatly impact its tonnage while not significantly affect its
the type of mill that is used for grinding ore in a modern concentrator is the wet tumbling mill. these mills may be divided into three types rod mills, ball mills and autogenous mills. in the first type, the rod mill, the ore is introduced into the mill.
the large balls tend to break down the coarse feed materials and the smaller balls help to form fine product by reducing void spaces between the balls. ball mills grind material by impact and attrition. the degree of milling in a ball mill is influenced by; residence time of the material in the mill chamber. the size, density and number of the
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