The sizing of ball mills and ball milling circuits from laboratory grinding tests is largely a question of applying empirical equations or factors based on accumulated experience Different manufacturers use different methods and it is difficult to check the validity of the sizing estimates when estimates from different sources are widely divergent It is especially difficult to teach mill
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The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum ‘chunk size’ product size as P80 and maximum and finally the type of circuit openclosed
In Grinding selecting calculate the correct or optimum ball size that allows for the best and optimumideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do Often the ball used in ball mills is oversize “just in case” Well this safety factor can cost you much in recovery andor mill liner wear and
Ball mill throughput data Gulin MachineryPopular Q A for Ball mill throughput data Q Now knowing the all the bond work wi Read more cement mill throughput calculation 20140825
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
However the total mill power consumption dropped 8 from an average of 7600 kW to 7000 kW The mill work index dropped 10 percent from an average of 55 kWhrT to 50 kWhrT Conclusions This represents a current view of the effects of grinding ball fragments in the milling circuit and the impact on the crushing and grinding circuit
WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWht WiRM Bond Rod Mill Test Work Index kWht WiSTD Standard Circuit Bond Work Index expected or designed used for circuit design Specific energy requirement at the drive pinions DS Work Index Work Index Efficiency Bond Work Index testing
Bond Test WI’s kWht Rod Mill Ball Mill 95 kWht8 9 kWht Bond Standard Circuit Work Index Assume the rod mill Work Index of 95 applies from the actual rod mill feed sizeof 19300 mµ although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16000 m to a rod µ
The high unit capacity SAG millball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many lowgrade hightonnage operations such as copper and gold ores feasible Future circuits may see increasing use of high pressure grinding rolls Rosas et al 2012
tonnage capacity of ball mill in finland Outotec’s delivery includes two ball mills and one SAG mill all of which are based on Outotec’s proprietary grinding mill technology The largest of the ball mills 85m dia 134m long with 22 MW power is equal in size to the largest ball mill ever manufactured The ball mill has a capacity of 25million metric tons per year and it
Ball Mill Design Calculations Ball mill design power calculation basic parameters used in ball mill design power calculation rod mill or any roller mill size is the characteristic of the material to be ground bond work index bulk density specific density required mill tonnage capacity dtph operating solid or pulp density feed size is F80 the largest size product size is p80 and maximum and
Grinding in small plants as in larger installations has proven to be the most costly of all unit operations from both capital and operating standpoints Therefore grinding deserves the most scrutiny of all operations during the design procedure A recent survey by a major grinding mill manufacturer reveals that more than 80 autogenous or semiautogenous mills having between 100 and 1000
Grate discharge ball mill Grate discharge ball mill can discharge material through sieve plate with the advantage of the low height of the discharge port which can make the material pass quickly so tha t to avoid overgrinding of material Under the same condition it has a higher capacity and can save more energy than other types of mills
The high unit capacity SAG millball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many lowgrade hightonnage operations such as copper and gold ores feasible Future circuits may see increasing use of high pressure grinding rolls Rosas et al 2012
Sep 01 2004 · INTRODUCTION For the ballmill scale up the Bond work index Wj together with the feed and product size 80 cumulative passing were used for the estimation from Bonds law of the specific grinding energy w From the specific grinding energy W kWhshort ton and the design tonnage rate capacity T short tonlh the total mill power draw
Ball Mill DesignPower Calculation The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and finally
ball mill load measurement using self Efficient Thickener Efficient Thickener Hydraulic Motor Driving Center Thickener Hydraulic Motor Driving Center Thickener Grid Type Ball Mill Grid Type Ball Mill Submerged Slurry Pump Submerged Slurry Pump Agitation Tank For Chemical Reagent
Ball Mill Work Index tests using crushed feed and Standard Autogenous Grinding Design SAGDesign Tests patented by Outokumpu See reference 8 below The comparison of these results gives context to how the various measurements relate to each other and how they can be used to obtain an accurate design for the grinding mills required for
It is important to note that the Bond Ball Mill Work Index on SAG ground ore is similar to but not the same as a crushed Bond Ball Mill Work Index It is 7 higher because the SAG mill grinds the softest components quickly and leaves the harder material to be ground in the ball mill Figure 3 presents the graph of SAG pinion energy vs BWi
Rod Mills are particularly useful if you run a low tonnage operation and are looking for coarse product Our Rod Mills are available in multiple diameters to fit the needs of your operation Grinding primarily by attrition Rod Mills require comparatively low levels of power to operate
effects of increased tonnage to a ball mill As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for anyel sizereduction requirements including quarry aggregate and different kinds of minerals
Calculate Ball Mill Grinding Capacity The sizing of ball mills and ball milling circuits from laboratory Ore Work Index kWh netmetric ton top of the ball charge causing the Total Charge Filling Level to be higher than Contact Now
Gulin machine in iron ore processing plant ball mill bond work index for limestone Gulin provide the ball mill bond work index for limestone solution case for you
100 ton per hour ball mill 100 tons capacity ball mill for gold ore punchfoodbe Ball Mill DesignPower Calculation Mineral Processing The basic parameters used in ball mill design power calculations rod mill desired mill tonnage capacity DTPH operating solids or pulp density Wi work index which is a factor relative to the kwh
Jan 01 2016 · Thus if d B is the ball diameter mm W i is the work index of the material kWht F 80 is the feed size 80 passing size in micrometre and ϕ C is the fraction of the critical speed of the mill then the largest size of the ball may be estimated by 716 d B 254 F 80 k 05 ρ S W i 100 ϕ C 3281 D 05 033 in mm where
Ball mills usually operate at 65 to 75 of the critical speed The critical speed is calculated as under 5 R r g 2 1 n c 2 213 Work Index Work index is defined as the gross energy required in kilowatthours per ton of feed needed to reduce a very large feed to such a size that 80 of the undersize passes through 100µm screen 5
to ball filling variation in the mill The results obtained from this work show the ball filling percentage variation is between 12– 37 which is lower than mill ball filling percentage according to the designed conditions 15 In addition acquired load samplings result for mill ball filling was 13
Ball mill throughput data Gulin MachineryPopular Q A for Ball mill throughput data Q Now knowing the all the bond work wi Read more cement mill throughput calculation 20140825
formulas to calculate efficiency of ball mill Efficient Thickener Efficient Thickener Hydraulic Motor Driving Center Thickener Hydraulic Motor Driving Center Thickener Grid Type Ball Mill Grid Type Ball Mill Submerged Slurry Pump Submerged Slurry Pump Agitation Tank For Chemical Reagent
Similar to a Comparative Work Index this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh normally 100 mesh The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index
It is important to note that the Bond Ball Mill Work Index on SAG ground ore is similar to but not the same as a crushed Bond Ball Mill Work Index It is 7 higher because the SAG mill grinds the softest components quickly and leaves the harder material to be ground in the ball mill Figure 3 presents the graph of SAG pinion energy vs BWi
This sizing used a ball mill work index of 100 kWht based on 200000 tonne capacity SAG Mill Svedala Krupp 11 MW drive material in the SAG mill Feed tonnage and the feed water ratio
We have effuciency calculation for ball millThe basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size
W is the work index measured in a laboratory ball mill kilowatthours per metric or short ton SAG mills use a ball charge of 8 to 21