Ball Mill and Grinding Circuit Preparation for StartUP The following items must be checked before the equipment in the Grinding Circuit is started Check the ore slot feeder for obstruction or hangups Check the ball mill belt feeder for undue buildup of material Check oil level in ball mill lube oil tanks Also check grease level in the mill ring gear spray lube drum Ensure that the
Chat Onlinestarting torque and motor curves to start ball mills Selection of ac induction motors for mining applications while a full gyratory crusher would have load torque requirements at startup ball mills the starting
Get Priceoftheart shell supported cement finish mill The torque and time requirements of the mill with the ball charge will set the magnitude and time of the inrush current during mill starting The inertia for this mill reflected to the motor shaft is calculated to be 24300 ftlbs2 The time to accelerate the mill to the design
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Get PriceBall mills on the other hand as far as process requirements are concerned did not require variable speed However frequency converter based drive systems provide benefits that improve the ball mill operation FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting
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Get PriceThe electrohydraulic machine is autocoupled and decompressed to reduce the starting current and its structure is divided into integral type and independent type Compared with similar productsWet Grid ball mill has the characteristics of low investment low energy consumption novel structure simple operation stable and reliable performance
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Get PriceSep 29 2008 · It is proposed to start a 13MW 33kV asynchronous induction motor for a ball mill on a weak supply by using a pony motor to bring the motor up to say 90 of rated speed before energizing the motor After the motor is energized and stable the clutch will engage What transient current will flow when the motor is energized
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Get PriceThe ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–15 times the shell diameter Figure 811The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20–40 water by weight
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Get Pricestarting material can be loaded either through a spout feeder or by means of a single or double helical scoop feeder Several types of ball mills are distinguished depending on the discharge system and these types are commonly known as overflow discharge mill diaphragm or grate discharge mill and centreperiphery discharge mill eg see 23
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Get Price1 Overload in overflow ball mills is due to the approach to a critical axial flow velocity for pulp of 0072 ms 2 While so far important only with 50 and 55 m diameter mills it should be found with smaller mills in combinations of very high circulating loads excessive LD ratios very soft ores or coarse grinds 3 A proper balancing of lower Lf and higher F values can reduce the risk
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Get PriceCOPPER MOUNTAIN OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES COPPER MOUNTAIN OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES accurate load sharing Figure 9 contains two striking points First interesting aspect is that the starting torque of this ball mill is about 78 far below the rated torque
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Get PriceApr 28 2012 · Ball mill is advanced technologies and energysavingwhich is not only high grinding capacity but also low energy is the main advantage of ball millHow to use ball millBall mill is suitable for grinding all kinds of ores and other materials which is widely used in mineral dressing building materialschemical and other industries Ball mill can be divided into dry type ball
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