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The ball mill is the most common ore grinding technology today and probably more than 50 of the total world energy consumption for ore grinding is consumed in ball mills

Effect of Grinding Media Charge on Mill Power Draw kW

Rod mills are normally operated with a 32 to 40 percent charge by volume which during operation becomes a 40 to 50 charge with a bulk density considerably lower than that of stacked rods This chart shows the impact a mill s grinding ball load has on the mill

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Figure 8 2 Media motion in the tumbling mill 8 1 Grinding 8 1 1 Grinding action Industrial grinding machines used in the mineral processing industries are mostly of the tumbling mill type These mills exist in a variety of types rod ball pebble autogenous and semi autogenous The grinding action is induced by relative motion between the

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If a ball mill uses little or no water during grinding it is a dry mill If a ball mill uses water during grinding it is a wet mill A typical ball mill will have a drum length that is 1 or 1 5 times the drum diameter Ball mills with a drum length to diameter ratio greater than 1 5 are referred to as tube mills Ball mills may be

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Smaller plants tend to add extra crushing stages in order to operate a single grinding stage only If a ball mill uses little or no water during grinding it is a dry mill If a ball mill uses water during grinding it is a wet mill A typical ball mill will have a drum length that is 1 or 1 5 times the drum diameter

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A Gupta D S Yan in Mineral Processing Design and Operation 2006 6 6 1 Estimation of Operating Pressure To operate the HPGR Polycom grinding mill the pressure required is applied hydraulically through four cylinders to the roll that is designed to move laterally The second roll is immovable The crushing pressure applied is generally of the order of 200 MPa but for hard ores higher

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The following equation is used to determine the power that wet grinding overflow ball mills should draw For mills larger than 3 3 meters 10 feet diameter inside liners the top size of the balls used affects the power drawn by the mill This is called the ball size factor S  Rod and Ball Mills by C A Rowland and D M Kjos Allis Chalmers

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The modeling and simulation of semiautogenous SAG mills have been widely used in the design and optimization of mill performance in terms of its power draw processing capacity and product size

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Effect of Ball Size and Properties on Mill Grinding Capacity Current ball milling theory suggests that grinding capacity is influenced by the size of balls charged to the mill In selecting the appropriate ball charge the first objective is to determine that ball

Effect of Grinding Media Charge on Mill Power Draw kW

Rod mills are normally operated with a 32 to 40 percent charge by volume which during operation becomes a 40 to 50 charge with a bulk density considerably lower than that of stacked rods This chart shows the impact a mill s grinding ball load has on the mill s motor power draw