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A 1.5 mio t/a cement plant is having a closed circuit ball mill for cement grinding The mill has been operating with satisfactory performance in terms of system availability and output however power consumption was on higher side 3.1 System Description Mill Rated capacity 150 t/h OPC at

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What is the cement ball mill The cement ball mill is mainly used for grinding the finished products and raw materials of cement plants and is also suitable for grinding various ore and other grindable materials in industrial and mining enterprises such as metallurgy chemical industry and electric power Cement grinding is the last process of cement production it is to mix cement

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Ball mills are horizontal cylindrical shaped equipment that finds application in grinding hard minerals to the form of fine powder The grinding operation is achieved here through rotation of cylinder with steel grinding balls/ceramic balls that causes balls to fall back

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Cement Mill Process Dr.P Subbaraj Director Research many factors including mill geometry speed ball size distribution mineral grindability and granule geometry Due to material z in the mill reaching a maximum for some critical value of z When z is too high the grinding efficiency decreases and

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nc is the mill speed in fraction of critical speed Li and Di are length and diameter inside shell lining respectively in meters For a mill with more than 2.1 m 7′ diameter the total power is obtained by dividing net power by 0.85 The graph is based on 40 charge volume Ball Mill Manufacturing

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Usually the hopper material is ground in a ball mill Figure 1 shows a simplified scheme of this process Figure 1 Simplified scheme of the cement grinding circuit Generally traditional ball mills are divided into two chambers and use vibration or noise sensors to measure the fill levels of these.

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cement industry with a cylinder diameter of 2200 mm at the Trino cement plant in Italy that belongs to the present Buzzi Unicem cement group Like the vertical roller mill the Horomill uses the centrifugal force principle for trans porting the material for which the material cylinder is driven above the critical rotational speed.

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Central drive ball mill torque and power conveyor speed torque required calculation excel sheet cement ball mill power calculation has the ball mill capacity load calculation ofgrinding mill calculation in ball mill a ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes paints.ball mill power

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A large ball mill is known for its large processing capacity and long daily operation time so it is also called a large scale ball mill or large capacity ball mill.The large ball mill is especially suitable for large scale grinding production It adopts two bin grinding which is more

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Ball Mill Grinder Specification Cement Plant Mill Ball mill grinder specification cement plant mill hammer crusher machinery working principle of ball mill ball cement milling mar 03 ball mill is an efficient tool for grinding many materials into fine powder the ball mill is used to grind many kinds of mine and other materials or to select the mine it is widely used in author.

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Ball mills operations and maintenance seminar Learn how to optimise your ball mill systems in this 5 day training seminar focused on best practices for operations and maintenance preventive and reactive to achieve energy savings reduced maintenance costs and overall improved productivity of the ball mill

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Stacker Machine A stacker machine creates stock piles of solid material such as coal cement The environment is dusty and build up on the level sensor probe is expected SLA 622 M and SLA 622 B level instruments with Sub Probe Type Super Strong SS ignore build up effectively and have a rugged design to ensure long service life.

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Report on Cement manufacturing process 1 A Report on Internship Taken At DCM Shriram Limited Kota Raj Submitted in partial fulfillment of the requirement for the degree of Bachelor of Technology Mechanical Engineering Duration June 5 2015 July 20 2015 Academic session Submitted to Mr Sanjeev Mittal GM Cement DCM HOD Dept of mechanical Engineering.

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The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell s inside surface This is the rotational speed where balls will not fall away from the mill s shell Result #1 This mill would need to spin at RPM to be at 100 critical speed Result #2 This mill s

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4 B4 Milling Ball Mills Cement Plant Operations Handbook ICR 4th Edn 2005 5 A Sahoo and G K Roy Correlation for the grindability of the ball mill as a measure of its performance Asia Pacific Journal of Chemical Engineering 3 2 p 2008 6.

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1The savings indicated are specific to the calculation date and mentioned site.These calculations may vary from site to site and from time to time depending on for example the application the operating conditions the current products being used the condition of

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Raw mills usually operate at 72 74 critical speed and cement mills at 74 76 3.2 Calculation of the Critical Mill Speed G weight of a grinding ball in kg w Angular velocity of the mill tube in radial/second w = 2 3.14 n/60 Di inside mill diameter in meter effective mill diameter n Revolution per minute in rpm 7.

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general the bigger the mill diameter the lower are the mill operating and critical speeds Thus for larger mills the number of poles will increase As a result the number of poles can vary from 48 to 72 poles Fig 3 with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills Figure 3.

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A ball mill critical speed actually ball rod ag or sag is the speed at which the centrifugal forces equal gravitational forces at the mill shell s inside surface and no balls will fall from its position onto the shell Sagmilling Mill Critical Speed Determination Mill critical speed determination the critical speed

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VpFraction of mill volume loaded with balls fCsFraction of critical speed SsBall size factor To determine the power that a dry grinding needs full grate discharge mill Equation 1 is multiplied by the factor of 1.08 A multi compartment ball mill consists of two or more grate discharge ball mills in series The same equation is

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Ball mill is a cylinder rotating at about 70 80 of critical speed on two trunnions in white metal bearings or slide shoe bearings for large capacity mills Closed circuit ball mill with two compartments for coarse and fine grinding are generally found in cement plants for cement grinding.

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Finish mill #11 was a standard ball mill capable of producing approximately 90 tons per hour of type I/II cement Finish mill #10 was a ball mill configured with a roller press for pre grinding capable of producing approximately 130 tons per hour of type I/II cement.

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Ball mill is a cylinder rotating at about 70 80 of critical speed on two trunnions in white metal bearings or slide shoe bearings for large capacity mills Closed circuit ball mill with two compartments for coarse and fine grinding are generally found in cement plants for cement grinding.

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Cement Ball Mill Structure When Ball Mill is working raw material enters the mill cylinder through the hollow shaft of the feed The inside of the cylinder is filled with grinding media of various diameters steel balls steel segments etc when the cylinder rotates around the horizontal axis at a certain speed Under the action of centrifugal force and friction force the medium and the

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This formula calculates the critical speed of any ball mill Most ball mills operate most efficiently between 65 and 75 of their critical speed Photo of a 10 Ft diameter by 32 Ft long ball mill in a Cement Plant Photo of a series of ball mills in a Copper Plant grinding the ore for flotation Image of cut away ball mill showing material

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Ball mills have been successfully run at speeds between 60 and 90 percent of critical speed but most mills operate at speeds between 65 and 79 percent of critical speed Rod mills speed should be limited to a maximum of 70 of critical speed and preferably should be in

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Ball mills Fig 1.1 are coming in cement plant areas of raw The large centre openings in the diaphragm and in the outlet grinding coal grinding and cement grinding which in turn as contribute to an over all very low pressure drop across the raw mill coal mill and cement mill Ball mills are horizontal UMS mills tube mills having single or

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As was mentioned above a gearless mill drive constitutes both an important part but also one of the most critical elements of a concentrator or a cement plant Their purpose is to ensure the continuous rotation of specific types of tumbling mills more specifically autogenous grinding AG mills semi autogenous grinding SAG mills or ball

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The SAG mill was designed to treat 2 065 t h −1 of ore at a ball charge of 8 volume total filling of 25 volume and an operating mill speed of 74 of critical The mill is fitted with 80 mm grates with total grate open area of 7.66 m 2 Hart et al 2001 A 4.5 m diameter by 5.2 m long trommel screens the discharge product at a cut size

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4 Tromp curve5 Mill critical speed6 Charge volume loading7 Grace factor and other ball mill parameters8 Mill power9 Ball weight and surface area10 Maximum ball size required –11 Measurement of wear12 Effects of gypsum upon setting time B5 Kilns and burning 284 1 Cement compounds and ratios2

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Ball mill introduction The ball mill is a key equipment for grinding materials widely used in powder making production line such as cement silicate sand new type building material refractory material fertilizer ore dressing of ferrous metal and non ferrous metal glass ceramics etc Ball mill can grind various ores

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Ball mills are usually operated at 75 of the critical speed The critical speed is the speed where mathematically calculated the grinding media would centrifuge out Mills of 2 m in diameter therefore rotate in operation at about 23 revolutions per minute which corresponds to a peripheral speed of 2.4 m/s A Ball mill of this size equipped

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