question on critical speed of a ball mill

• What it is the optimun speed for a ball mill

Oct 19 2006 · Posted 21 October 2006 - 04:24 PM. Congratulations on your ball mill! You'll want to further reduce your motor speed by 3:1 to mill more efficiently. Right now your RPM is just slightly under the speed where the media won't do any work. The optimum speed for

Get Price
• Critical rotation speed for ball

Aug 03 1999 · The critical rotation speed of the jar significantly depends on the ball-containing fraction as seen in Fig. 3 and is not determined by Eq. (1)for given radii of the jar and the ball only.The critical rotation speed is close to the value determined by Eq.(1) as the ball-containing fraction approaches to one since concentric circles approximately represent the trajectories of balls as the

Get Price
• how to calculate optimum milling speed from critical speed

how to calculate critical speed of a ball mill. critical speed of ball mill calculation - birdsandbots.nl. Oct 18 2006· What it is the optimun speed for a ball mill ? - posted in Pyrotechnics: I have done a ball mill recenly finished but the motor has too rpms is too fast for use in a ball mill (the pvc cylinder that i

Get Price
• what is critical speed in a ball mill

Critical Speed Of Ball Mill Inkuba A ball mill critical speed actually ball rod ag or sag is the speed at which the formula derivation ends up as follow critical speed is nc chat onlineall mill operating speed mechanical operations solved problems in a ball mill of diameter 2000 mm 100 mm dia steel balls are being used for

Get Price
• critical speed calculation for ball mill

calculate critical speed of ball mill - rhinoartcozaA Ball Mill Critical Speed (actually ball rod AG or SAG) is the speed at which The critical speed of a rotating mill is the RPM at which a grinding medium You'll find a good online tool for ball mill critical speed calculation.Critical Speed Of Ball Mill Calculation IndiaTECHNICAL NOTES 8 GRINDING R P King The critical speed of the mill

Get Price
• Mechanical Operations MCQ Questions Answers | Chemical Engineering. Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7. 26. In case of a ball mill A. Coarse feed requires a larger ball. B. Fine feed requires a larger ball. C. Operating speed should be more than the critical speed

Get Price
• Ball mill

Apr 24 2015 · -Critical speed R –radii of the mill r- radii of the ball g –acceleration due to gravity 10. Critical speed of ball mill(in rps)= R=.45/2=.225m r=25/2=12.5m g=9.81m/s2 Nc=1.08rps=64.8 rpm 11. r=60/2=30mm R=800/2=400mm Nc=.82 rpm Critical speed=1.4*operating speed Operating speed =.82/1.4=.586 rps=35 rpm

Get Price
• Ball Mills

The point where the mill becomes a centrifuge is called the "Critical Speed" and ball mills usually operate at 65% to 75% of the critical speed. Ball Mills are generally used to grind material 1/4 inch and finer down to the particle size of 20 to 75 microns.

Get Price
• Question is ⇒ The operating speed of a ball mill should be

Question is ⇒ The operating speed of a ball mill should be _____ the critical speed. Options are ⇒ (A) less than (B) much more than (C) at least equal to (D) slightly more than (E) Leave your comments or Download question paper. Previous question Next question. Q1.

Get Price
• Ball mill electric motor

Jul 24 2020 · First thing you need to do is calculate your critical speed. Then you can calculate the speed of your gear reducer and motor. I have a ball mill a little larger than yours. I use a 3HP motor at 1750 RPM and a 40:1 gear reducer. Here is an article to get you started.

Get Price
• Critical Speed Equation Of A Ball Mill

The critical speed of the mill c is defined as the speed at which a single ballIn equation 8.14 D is the diameter inside the mill liners and Le is theRod and ball mills in Mular AL and Bhappu R B Editors Mineral Processing Plant Design.

Get Price
• Ball Mill

Nov 30 2015 · CONSTRUCTION (CONTD) The length of mill is approximately equal to its diameter. Ball occupy about 30-50% of the volume. The dia of ball is 12mm to 125mm. The dia of shell is 3m and its length is about 4.25m. The shell is rotated through a drive gear with speed 60-100 rpm. 10.

Get Price
• Multiple Choice Question (MCQ)

2) Critical speed of a ball mill depends on (A) the radius of the mill (shell) and the radius of the particles (B) the radius of the mill (shell) and the density of the particles (C) the radius of the balls and the radius of the particles (D) the radius of the balls and the radius of the mill (shell)

Get Price
• GATE Chemical Engineering Questions and Answers

Aug 11 2021 · GATE Chemical Engineering Questions and Answers - Mechanical Operations The critical speed of the ball mill of radius R which contains balls of radius r is proportional to (A) (R-r) -0.5

Get Price
• how to calculate the critical speed of rotating drum

How to calculate critical speed of any rotating equipments?If a centrifugal fan rpm is 1000due to any problem we need to reduce rpm of 500 by using low capacity prime moverso we should know the critical. Read More.

Get Price
• 206 questions with answers in BALL MILLING

Aug 09 2017 · i was trying to produce Ti02 nano particles in high speed ball milling machine. my initial setting was 400 rpm 6:3 start stop time and ethanol and stearic acid were used as PCA.

Get Price
• Calculation For The Critical Speed Of Ball Mill In

How To Calculate Mill Critcal Speed. Ball Mill Critical Speed Mineral Processing Amp 2021-1-22 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 Shells Inside Surface And No Balls Will Fall From Its Position Onto The Shell.

Get Price
• Improving product quality in pharmaceutical ball milling

The study explores the effect of the rotation speed and other parameters on the breakage behaviour of DEM granules during the ball milling process. One of the conclusions of the study was that the collisions between the balls and the product granules increased proportionally with rotation speed until a critical speed was reached with mill

Get Price
• Mill Critical Speed Calculation

Oct 15 2015 · The mill was rotated at 63% of the critical speed. The position of the balls at the end of five revolutions is shown in Figure 2. It is seen that using a low coefficient of friction at the walls balls tend to flow down the surface of the charge and a “toe” begins to form. As the friction at the wall increases aracting motion is observed.

Get Price
• Ball mill

A ball mill a type of grinder is a cylindrical device used in grinding (or mixing) materials like ores chemicals ceramic raw materials and paints.Ball mills rotate around a horizontal axis partially filled with the material to be ground plus the grinding medium. Different materials are used as media including ceramic balls flint pebbles and stainless steel balls.

Get Price
• Mechanical Operations MCQ’s – Intermediate and Fine

d) Bold grinding. View Answer Solution. Answer: a. Explanation: The speed at which the centrifuging occurs is called as the critical speed and little or no grinding tales place during this phase. 5 - Question. What is the angle of nip for ball mill? a) 4π 2 n 2 (R-d)/g. b) 4π 2 n 2 (R+d)/g. c) 4π 2 n 2 (R-r)/g.

Get Price
• Q2: A ball mill of 1.8 m diameter is loaded with steel balls each having a diameter of 6 cm. The rational speed of the ball is kept at 75% of critical speed. The operational speed of ball mill in rpm is? Ans: 23 to 25. Q3: The correct conditions for which the hydraulically efficient rectangular channel will deliver maximum discharge are-

Get Price
• In case of a ball mill

In case of a ball mill A. Coarse feed requires a larger ball. B. Fine feed requires a larger ball. C. Operating speed should be more than the critical speed. D.

Get Price
• Intro to Rotary Ball Mill Process and Operation 101

of material size). We will cover concepts related to communition material flow ball flow liners diaphragms critical speed fill degree and more. Interactive labs with hands-on experience will help further reinforce the theories in class. This class is designed to answer your ball mill process questions

Get Price
• 4. Size reduction problems Questions _2020 batch.docx

14. a) What is the critical speed in rpm of a ball mill having a inside diameter of 120 cm charged with 7.5 cm spherical balls (Answer: N c = 40 rpm) b) Calculate the operating speed of the ball mill from the following data: Diameter of the ball mill is 500 mm; diameter of the balls are 40 mm. If the operating speed is 50 % of the critical speed of the mill.

Get Price
• Calculate Critical Speed Of Ball Mill Practical

Mar 02 2021 · Question On Critical Speed Of Ball Mill. Ball sie distribution for the maximum production of a the technological and operating specifiions of the industrial mill are diameter d of 7312 m and length l of 96 m mill speed c 75 of critical ball filling j ranging from 25 to 33 mill power draw of about 9500 kw at 30 ball.

Get Price
• The critical speed of the ball mill is less than 45%

Chemical Engineering questions and answers. The critical speed of the ball mill is less than 45% of operating speed. Now calculate the operating speed of the ball mill which has diameter of 900 mm. Diameter of ball is 80 mm. a) 47 rpm b) 68 rpm c) 32 rpm d) 21 pm. Question: The critical speed of the ball mill is less than 45% of operating speed.

Get Price
• Critical speed of rotation N (in rps – rotation per

Question Answer. Q: Critical speed of rotation N (in rps – rotation per second) of a trammel is equal to (where g = acceleration due to gravity = 9.81 m/sec2 and r = radius of trammel metre.) ? In a ball mill the volume occupied by the balls (when the mill is stopped) is about _____ percent of the volume of the mill?

Get Price
• Equation Formula Critical Speed Of The Ball Mill 2cmuc

Critical Speed Of A Ball Mill FormulaThe formula to calculate critical speed is given below N c 42305 sqtDd N c critical speed of the mill D mill diameter specified in meters d diameter of the ball In practice Ball Mills are driven at a speed of 5090 of the critical speed the

Get Price
• The operating speed of a ball mill should be the critical

Click here for the answer of The operating speed of a ball mill should be _____ the critical speed? by thebuzzfeed with answers and explanation.

Get Price

Related Products 