Calculate Top Ball Size of Grinding Media FRED C BOND Equation Method Previous Next Although it was developed nearly 50 years ago Bond ‘s method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills
Chat Online2 Ball milling – a ball mill with a diameter of 244 meters inside new liners grinding wet in open circuit When the grinding conditions differ from these specified conditions efficiency factors Rowland and Kjos 1978 have to be used in conjunction with equation 1
The ball mill is a key piece of equipment for grinding crushed materials and it is widely used in production lines for powders such as cement silicates refractory material fertilizer glass ceramics etc as well as for ore dressing of both ferrous and nonferrous metals The ball mill can grind various ores and other materials either wet or dry
The High Energy Ball Mill E max and MM 500 were developed for grinding with the highest energy input The innovative design of both the mills and the grinding jars allows for continuous grinding down to the nano range in the shortest amount of time with only minor warming effects
Ball Mill Design A survey of Australian processing plants revealed a maximum ball mill diameter of 524 meters and length of 884 meters Morrell 1996 Autogenous mills range up to 12 meters in diameter The lengthtodiameter ratios in the previous table are for normal applications For primary grinding the ratio could vary between 11and 181
Feed Size VS Ball Size 7 replies One can argue the f50 is a more realistic value since balls wear and the average ball size might be closer to half the maximum Then the multiple would be closer to 13 times the maximum particle size fed to the ball mill A f80 6 mm would need a ball size of 75 mm
Testing Plant Equipment In order to determine among other things the operating conditions of the ballmill when working on this rock a test mill of about 300 T daily capacity was erected at Duluth Minn The finecrushing plant contains a Hardinge 8ft by 22in 24m by 558cm conical mill a 6 by 27ft
The 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
BallRod Mills based on 4″ liners and capacity varying as 26 power of mill diameter on the 5′ size give 20 per cent increased capacity on the 4′ size 25 per cent and on the 3′ size 28 per cent
Grinding Balls Rods As a general figure rod mills will have a void space within the charge of around 20 to 22 for new rods In ball mills the theoretical void space is around 42 to 43 It has been found that as grinding rods wear a 4″ or 4½” rod will generally break up at about 1½” diameter
Jun 25 2018 · Mill effective diameter 223 m 335 is a constant used for dry grinding with steel balls in the mill Actual size of media is taken is lower than the calculated value It is around 80 to 90 mm If you Wants to reduce the maximum ball size thenreduce the feed size by using pregrinding operation
Feeding size ≤30mm Output size 00440173mm More products Raymond Mill more Ball mill is widely used for dry or wet grinding of various ores and other abrasive materials Aileen Ball Mill Type The ball mill is the key equipment for grinding after the material is broken Often used for ore dressing Aileen ANY HELP Please tell
Every mining operation has a unique grinding process Metso offers AG mills SAG mills ball and pebble mills and stirred mills to your needs By continuing to use the site you agree to the use of cookies You can find out more by reading our cookie policy
Ball mill is a key equipment to recrush primary crushed materials Ball mills are widely used in cement silicate products 52555 new building materials refractory materials fertilizer ferrous and nonferrous metals and glass ceramics and other production industries
When charging a ball mill ceramic lined mill pebble mill jar mill or laboratory jar use on a jar rolling mill it is important to have the correct amount of media and correct amount of product Charging a Dry Mill – The general operation of a grinding mill is to have the
Common powder milling equipment High speed hammer mills tip speed from 40 to 70 ms can allow to reach small particles sizes below 01 mm A universal mill is a derivation of the hammer mill with more sophisticated beaters as well as grinding tracks and sieves Tip speed ranges from 40 to 100 ms
Fig 6 shows one set of results where the circuit capacities are shown in threeballsize ternary diagrams for various feed sizes with a circulation ratio of 25 at a size reduction ratio of 451 using a 1 m diameter ball mill It can be seen that maximum contour lines stay in the bottom of the diagrams for all cases indicating that intermediate size balls 359 mm balls do not play a significant role as far as the
Metso has designed manufactured and installed over 8000 ball and pebble mills all over the world for a wide range of applications Some of those applications are grate discharge peripheral discharge dry grinding special length to diameter ratio high temperature milling oprations and more
SemiAutogenous Grinding SAG Mill Wet or dry Higher capacity than AG mill grinding Primary coarse grinding up to 400 mm feed size Grinding media is grinding feed plus 412 ball charge ball dia100 125 mm High capacity short retention time Less sensitive to
Dec 26 2017 · According to Bond 1954 the grinding efficiency of a mill depends on the ball mill diameter size of the media and mill speed Ball mills with different length to diameter ratios for a particular power rating will produce different material retention times
The High Energy Ball Mill Emax combines highfrequency impact intensive friction and controlled circular jar movements to a unique and highly effective size reduction mechanism The grinding jars have an oval shape and are mounted on two discs respectively which move the jars on a circular course without changing their orientation
Starting with the 1700 850 μm size class the measured sample together with the specified size of grinding media were then fed into the mill Table 1 whose operating conditions are specified in Table 2 The feed material was dry batch milled for selected periods ranging from 3 5 15 30–90 min
Silicon Nitride Balls are very highcost grinding media that are used for milling same materials silicon nitride ball to mill silicon nitride materials to avoid contamination They are now available in 2mm and 3mm and sizes up to 25mm
The ball mill is a key piece of equipment for grinding crushed materials and it is widely used in production lines for powders such as cement silicates refractory material fertilizer glass ceramics etc as well as for ore dressing of both ferrous and nonferrous metals
How to optimize a 6 pound ball mill to safely and effectively ball mill homemade black powder Heres Your Next Ball Mill What is a ball mill Put some rocks and grinding media in along with some water and after hours or days out come nice pretty shiny rocks mill jars of this size should be turning at about 8090 RPM for optimum
The operating principle of the ball mill consists of following steps In a continuously operating ball mill feed material fed through the central hole one of the caps into the drum and moves therealong being exposed by grinding media The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls
Features transmission adopts largescale double row selfaligning roller bearing instead of sliding bearing which is easy to start and saves energy up to 2030 2 Grinding ball mill adopts groovetype circular lining plate to increase contacting areas of iron balls and ores which enhances grinding action and ore lifting capacity
The first problem will ball mills is that we cannot see what is occurring in the mill The other problem is that many of the independent variables are nonlinear or have paradoxical effects on the end results In ball milling of dry solids the main independent variables are mill diameter mill speed media size solids loading and residence time