# which it is the speed of a ball mill rod mill

### Rod mills, how they function Mine Engineer.Com

The Critical Speed is used for the determination of ball mill ideal operating speed. But for comparison, rod mills would operate between 50% to 95% of the critical speed. The faster the mill speed, the greater the wear on the rods and liners. So, the general rule of thumb for rod mills is to operate no faster than the speed that will obtain the

### Which one is the best, ball mill or rod mill?

Sep 09, 2019· The ratio of barrel length to diameter of the ball mill is small, and in most cases the ratio is only slightly greater than 1. In addition, according to the China Fote Machinery the barrel speed of the rod mill is lower than the operating speed of the ball mill of the same specification, so that the medium inside the machine is in a drop-off state.

### AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator Training

Introduction### What are the differences between ball mill and rod mill

The rod of diameter from 50 to 100 mm is often used as the grinding medium, and the filling rate of rod mill is 35% to 45%, while filling rate of ball mill is 40% to 50%. Rod is mainly made of several materials:

### Ball Mills an overview | ScienceDirect Topics

The ball mill contains a hollow cylindrical shell that rotates about its axis. This cylinder is filled with balls that are made of stainless steel or rubber to the material contained in it. Ball mills are classified as attritor, horizontal, planetary, high energy, or shaker.

### Mill Speed Critical Speed Paul O. Abbe

Mill Speed Critical Speed. Mill Speed . No matter how large or small a mill, ball mill, ceramic lined mill, pebble mill, jar mill or laboratory jar rolling mill, its rotational speed is important to proper and efficient mill operation. Too low a speed and little energy is imparted on the product.

### 7 Differences Between Ball Mill and Rod Mill Xinhai

In addition, the cylinder speed of the rod mill is lower than that of the ball mill, so the grinding medium works in the cascading state. 2. Discharging way of ball mill and rod mill. The ball mill is commonly divided into grid type ball mill and overflow type ball mill (named by the different discharging structure).

### Ball Mill Critical Speed

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. The imagery below helps explain what goes on inside a mill as speed varies. Use our online formula The mill speed is typically defined as the percent of the Theoretical

### Ball Mill: Operating principles, components, Uses

A ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis. The balls which could be of different diameter occupy 30 – 50 % of the mill volume and its size depends on the feed and mill size.

### Which one is the best, ball mill or rod mill?

Sep 09, 2019· The ratio of barrel length to diameter of the ball mill is small, and in most cases the ratio is only slightly greater than 1. In addition, according to the China Fote Machinery the barrel speed of the rod mill is lower than the operating speed of the ball mill of the same specification, so that the medium inside the machine is in a drop-off state.

### Ball Mill vs Rod Mill | How To Choose Ball Mill or Rod

The rod mill usually uses 50-100mm diameter steel rod as grinding medium, while the ball mill uses steel ball as grinding medium. The length of steel rod is 25-50mm shorter than the cylinder, and it is usually made of high carbon steel with carbon content of 0.8% – 1%; the loading capacity of rod is about 35% – 45% of the effective volume

### 7 Differences Between Ball Mill and Rod Mill Xinhai

In addition, the cylinder speed of the rod mill is lower than that of the ball mill, so the grinding medium works in the cascading state. 2. Discharging way of ball mill and rod mill. The ball mill is commonly divided into grid type ball mill and overflow type ball mill (named by the different discharging structure).

### What's the Difference Between Ball Mills and Rod Mills

Nov 19, 2019· The rod mill adopts overflow type and open type discharge, does not use grate type discharge. The diameter of the rod mill discharge end is larger than that of the same size ball mill. When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state.

### Conversion of Rod mill to Ball mill Grinding

Rod mill to ball mill can be done, it is the other way that is difficult. The biggest issue will probably be your ball storage and feed system. This is very different from a rod feed system. Also balls are fed on a fairly regular basis such as once a day.

### Ball Mill: Operating principles, components, Uses

A ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis. The balls which could be of different diameter occupy 30 – 50 % of the mill volume and its size depends on the feed and mill size.

### Ball Mill an overview | ScienceDirect Topics

The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 1–1.5 times the shell diameter (Figure 8.11).The feed can be dry, with less than 3% moisture to minimize ball coating, or slurry containing 20–40% water by weight.

### Rod Mill Critical Speed ideemotor

Rod Mill Design Calculation Critical Speed. 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. the imagery below helps explain what goes on inside a mill as speed varies.

### Ball mill Wikipedia

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.

### Rod Mills for coarse grinding |

Grind coarse feed material with a reliable Rod Mill that won't over-grind. If you are in need of an application for coarse materials like limestone, potash, coal, phosphate and bauxite, you may be looking for a solutions like Rod Mills. Rod Mills are particularly useful, if you run a low tonnage operation and are looking for coarse product.

### Mill Charge an overview | ScienceDirect Topics

In Mineral Processing Design and Operations (Second Edition), 2016. 9.3.4 Mill Speed. During normal operation the mill speed tends to vary with mill charge.According to available literature, the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85% of the critical speed.

### Essa® Laboratory Ball and Rod Mills

The Essa® ball and rod mill range includes: Essa® BM Series Laboratory Ball Mills – ideal for producing finer particles. Available in 6.3 L, 12.3 L and 21 L barrel volumes. Essa® RM Series Laboratory Rod Mills – suitable for larger and more coarse materials. Available in 7.8 L,

### Mill (grinding) Wikipedia

Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency [5]

### Used Ball-mills For Sale A.M. King

Inventory ID: 6C-141. 2 Units UNUSED minevik 22' x 36'5" (6.71m x 11.13m) Ball Mills, each with (2) GE Dual Pinion Synchronous 4,650 KW (6,250 HP) Motors (50 HZ) 1 Fixed Speed Drive and 1 Variable Speed

### What's the Difference Between Ball Mills and Rod Mills

Nov 19, 2019· The rod mill adopts overflow type and open type discharge, does not use grate type discharge. The diameter of the rod mill discharge end is larger than that of the same size ball mill. When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state.

### Technical Performance and Application of Ball Mill and Rod

However, due to the high discharge speed of the lattice type ball mill, the residence time of the material in the mill is short, the product size is relatively coarse, and the suitable milled product has a particle size of 0.3-0.2 mm or 0.074 mm.

### Difference between Rod mill and Ball mill Fodamon Machinery

There are various ratios of the length and diameter of the ball mill, such as those below 2, about 3, and above 4. In addition, the rotating speed of the barrel of the rod mill is lower than the working speed of the ball mill of the same specification, so that the medium in the rod mill can work in the dump state. 2. Ore discharge mode

### Ball Mill&Rod Mill Grinding System Used in Mineral Milling

Our ball mill / rod mill grinding solution for different minerals with the features as below: Lower power consumption & operation cost Air clutch system for starting the motor safely Alternative synchronous or asynchronous motor Low speed driving unit with lifting device, convenient for maintenance.

### Critical Speed Of Ball Mill Of Raduis R

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 Get Price Ball Mill Operating SpeedMechanical Operations The critical speed of ball mill is given by where R radius of ball mill r radius of ball For R mm and r

### Rod/Ball Mill| Eriez Lab Equipment

The Rolls are 120 mm diameter x 1200 mm long and powered by a 0.37 KW 220 Volt Motor with a variable speed controller. Ball/Rod mill Literature . The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level. They are the most effective laboratory mills for batch-wise

### Dynamic spindle-speed and feed-rate for ball end mill 3D

Dynamic spindle-speed and feed-rate for ball end mill 3D finishing Finishing 3D surfaces with a 3-axis machine and a ball end-mill can be challenging. In a single op, you can have the ball engaged near the tip where the SFM is much lower, and other times engaged near the side where it behaves more like a straight endmill -- and anywhere in between.

### Ball mills minevik

With more than 100 years of experience in ball mill technology, minevik’s ball mills are designed for long life and minimum maintenance. They grind ores and other materials typically to 35 mesh or finer in a variety of applications, both in open or closed circuits.

### Effects of slurry filling and mill speed on the net power

Ball filling and mill fractional speed were kept constant respectively at 20% and 60% while slurry filling was varied from 0% to 300%. Key factors for improving the economic performance of rod

### AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit.

### What Is The Difference Between Ball Mill and Raymond Mill

Both the ball mill and raymond mill are powder grinding equipments.The fundamental difference between them is that the raymond mill is sand -making equipment while the ball mill is ore beneficiation equipment.Raymond mill is widely used in barite, limestone, fluorite, calcite, potash feldspar, talc, marble, lime, active white soil, phosphate ore, activated carbon, gypsum, glass, bentonite

### SAG/Ball Mill Optimization | KnowledgeScape

GrindingExpert™ automatically adjust feed rate, mill speed and water addition to reduce upsets, eliminate grind-outs and increase tonnage in SAG / ball mills. We constantly maintain desired operating conditions by monitoring bearing pressure, power, recycle pebbles, mill density and mill acoustics.

### Ball vs Rod vs Roll Mills Gold Refining Forum

Jun 11, 2019· In the order you have listed; a ball mill can fine grind down to <400 mesh if needed, a rod mill will efficiently grind to 150/200 mesh range, and a roll mill can do a +/- 100 mesh. The ball and rod mills are similar in appearence, as a large rotating lined cylindrical tube filled with either metal balls or long rods used as the grinding medium.

### Making a Ball Mill

Mar 31, 2018· The milling of the materials is a very useful procedure in various domains in life as well as in the constructive domain. Click HERE to subscribe to Make i...

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