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Jan 08 2012Math cement module1 material based on bond test mill resultMCV1B204RawMill1r4 dry basis Calculation of Power at Ball Mill Shaft for Raw Materialbased on Bonds WorkMCV1B204RawMill2BIU Index Calculation of power at Ball Mill shaft for Raw material based on Bonds workMCV1B204RawMill2 index Raw Mill and Auxiliary
Ring gear drives huge grinding mill By this summer a grinding mill that is bigger around than a Boeing 747 will turn chunks of copper ore into gravelsized bits for smelting and refining The
Dec 28 2015Bucket Elevator Motor Power Calculation If this is your first visit be sure to check out the FAQ by clicking the link above You may have to register before you can post click the register link above to proceed
Aug 28 2011Re Ball Mill Girth Gear and Pinion Alignment 08272011 207 AM pinion alighnment is done by coating the pinion with a lead based grease after rotating the drum the grease marks will show the contact area the pinion should contact the girth ring near the center of the gears
Mar 31 2008The output achieved by a ball mill system varies with the mill power the fineness of the product and the hardness of the clinker A typical general purpose Portland cement of fineness specific surface 340 mkg1 ground on an efficient closedcircuit ball mill system requires around 32 kWh per tonne so a 10 MW mill would produce 313 tonnes of this per hour
Popular Answers 1 Ball size depends on initial size of charge and ranges from 10mm150mm dia For particular material and initial size the ball size must be optimized Please refer the link below and see if it works for you and other method is hit and trial
The Hz rating is determined by the power system available at the site Because the cement market is global with many Hz and voltage binations the Hz value cannot be assumed It is important to the motor manufacturer in the proper design of a motor which would be different for Chile 50 Hz than Argentina 60 Hz
Ball mill 9000 HP Motor speed 990 rpm Mill speed 14 rpm RL ill diameter 5 m Mill bearing 22 m Project A Twopinion girth gear drive Fig 2A 1 Gear cutting of a split girth gear for a cement mill having an input power of 2200 HP 5 Separate mill A Damage to mill cylinder neck or stub endanger girth gear and pinion
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M Ahrens ABB Switzerland numerous GMDs for ball mills and SAG mills have been installed in the simple using the mill body as motor rotor and mounting the poles there As a result the motor does not have a separate motor rotor and thus
BALL MILL DRIVES LOADED OVERALL VIBRATION SEPTEMBER 1A 1B Above is a plot of the overall vibration levels at both the 1A 1B ball mills when loaded Note how levels at 1A ball mill are higher than that at 1B ball mill for nearly every measurement
Cement vertical roller mills and in parison with traditional ball mill operations the energy requirements for the OK cement mill is 3045 percent lower for cement grinding and 4050 percent lower for slag The OK mill can contribute significantly to profitability and petitiveness
Ball Mills are generally used to grind material 14 inch and finer down to the particle size of 20 to 75 microns To achieve a reasonable efficiency with ball mills they must be operated in a closed system with oversize material continuously being recirculated back into the mill to be reduced
Motor Sizing Proper sizing and selection of a motor for your equipment is key to ensuring performance reliability and cost of the equipment In addition to the information below for properly sizing a motor Oriental Motor offers online motor sizing tools as well as assistance from our Technical Support staff
Fullload tests on a planetary gear of a large ball mill and to determine the efficiency of the drive system including the motor losses A suitable object presented itself with the drive unit of a ball mill in the Schwe1gern cement works of the Rheinischen Ka1ksteinwerke GmbH Wli1frath in DuisburgHamborn Transmitted power Speeds
ABBs GMD is the most powerful mill drive system in the market to power semiautogenous SAG ball and autogenous AG mills This workhorsefor grinding operations bines a robust servicefriendly and fit for purpose design to provide highest throughput reliability
Autogenous mills semiautogenous mills and ball mills for wet grinding A pany of Polysius ThyssenKrupp cement clinker coal and other materials Polysius has been ball mills 4 Motor power at 35 ball charge The standard range ofmedium size and big ball mills
Jan 07 2015Raw mills usually operate at 7274 critical speed and cement mills at 7476 32 Calculation of the Critical Mill Speed G weight of a grinding ball in kg w Angular velocity of the mill tube in radialsecond w 2314n60 Di inside mill diameter in meter effective mill diameter n Revolution per minute in rpm
The geometry of a mill with conical ends is shown in Figure 86 The total volume inside the mill is given by Vm 4 D2 mL 1 2Lc L L 1 DtDm 3 1 DtDm 816 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill
This paper mainly introduces the raw mill in cement plant In order to achieve the desired setting qualities in the finished product a quantity 28 but typically 5 of calcium sulfate usually gypsum or anhydrite is added to the clinker and the mixture is finely ground to form the finished cement powder This is achieved in a cement raw mill
Aug 11 2015Ball mill preventive maintenance PM It is a frequency work to maintain and repair ball mills AG mills and SAG mills The maintenance work influences the rotational speed and service life of ball mills In order to reduce downtime of ball mill regular examination and timely replacement of the parts should be done
We can provide all elements of a mill drive system as a fully optimised solution to suit your process exactly or individual mill drive gearboxes girth gears pinions and couplings as required Designed to deliver exceptional levels of performance and value David Brown Santasalo ball mill drives are optimised for primary and secondary
The design of a ball mill can vary significantly depending on the size the equipment used to load the starting material feeders and the system for discharging the output product The size of a mill is usually characterized by the ratio length to diameterand this ratio most frequently varies from 05 to 35 The
Motor rating calculation in cement ball mill motor power calculation for ball and tube mill YouTube motor power calculation for ball and tube mill More details motor
The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency a Mill Geometry and Speed Bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for remended media size and mill speed that take this factor into account
2 Units UNUSED METSO 22 x 365 671m x 1113m Ball Mills each with 2 GE Dual Pinion Synchronous 4650 KW 6250 HP Motors 50 HZ 1 Fixed Speed Drive and 1 Variable Speed
Enter the width of a mill shell liner Note this is not the width of a lifter You may use the Mill Liner Effective Width calculation to determine this value The mill critical speed will be calculated based on the diameter above less twice this shell liner width Mill Actual RPM Enter the measured mill rotation in revolutions per minute
Training Courses based on the Grinding Software Presentations available Ball Charges Kit 1 Ball charges Composition Calculator for Monochamber Mills 2 Ball charges Composition Calculator for 2 Chambers Mills 3 Ball charges Composition Calculator for 3 Chambers 11 Cement Ball Mill Sizing Explanation Introduction
Ball mills are monly used in the manufacture of Portland cement and finer grinding stages of mineral processing one example being the Sepro tyre drive Grinding Mill Industrial ball mills can be as large as 85 m 28 ft in diameter with a 22 MW motor 4 drawing approximately 00011 of the total worlds power see List of countries by
Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80 passing inch 6350 microns
Selecting Inching Drives for Mill and Kiln Applications Glen Cahala Frank C Uherek Principal Engineer Gear Engineering Software Development Abstract The inching drive also known as a barring or auxiliary drive is an important ponent of any mill or kiln installation It is used for maintenance and inspection purposes as
Cement Mill Noise Level and Attenuation Report Page 3 2 Introduction This study was conducted to evaluate noise levels of both conventional ball mills and vertical roller mills for cement andor slag grinding and to determine levels of attenuation of such noise in a space
A 15 mio ta cement plant is having a closed circuit ball mill for cement grinding The mill has been operating with satisfactory performance interms of system availability and output however power consumption was on higher side 31 System Description Mill Rated capacity 150 th OPC at
Figure 21 6050 hp motor with modified air cooling at both ends of the enclosure 72 Ball mill with slip ring induction motor A recent feasibility study for a new cement grinding facility in an existing plant remended a 6700 hp 900 rpm 66 kV motor for the cement mill drive
Jan 30 2018According to the operating experience the output of each mediumton ball mill and raw material mill per ton of grinding body is 340450 kg per hour some In the case of 550 kg per hour the cement ball mill can produce 300400 kg per ton of grinding body
Dec 03 2010Ball Mill Load feed why the load of main motor of mill reduces with chocking of mill can we calculate how much load will go down by how much chocking tell me actaul calculation what is arm of garvity torrque factor for ball mill rm Reply Know the answer to this question Join the munity and register for a free guest account to
Calculate and Select Ball Mill Ball Size for Optimum Grinding Based on his work this formula can be derived for ball diameter sizing and selection Dm 6 log dk d05 where D m the diameter of the singlesized balls in mmd the diameter of the largest chunks of ore in the mill feed in mm