Ball Mill Index Process Cost Formula

Ball mill power calculation example 1 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 the required product size distribution is to be 80 passing 100 mesh 149 microns.

Ball mill work index was averaging only 116 kwht which is not hard a rod mill work index gure was not found but was thought to be in the 16 kwht to 18 kwht range the xstrata zinc 22 ft id 40 ft egl over ow ball mill was installed at mt isa in 2009 this mill was put into single.

Ball mills are usually the largest consumers of energy within a mineral concentrator comminution is responsible for 50 of the total mineral processing cost.

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.

Bond work index procedure and method this grindability test or bond ball mill work index procedure is used to determine the bond work index of minus six mesh or finer feed ore samples these equation application methods are used to process 12 ore samples in a ball mill using a standard ball charge.

Calculation of energy required for grinding in a ball mill int j miner proc the bond work index wi as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.

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 the required product size distribution is to be 80 passing 100 mesh 149 microns.

if p is less than 80 passing 70 microns power consumption will be ball mill power calculation example a wet grinding ball mill in closed circuit is to be fed 100 tph of a.

Even though semiautogenous grinding mills and ball mills are normally used in grinding processes the industry is driven to decrease cost by increasing efficiencies and decreasing energy consumption.

Fig 2 specifi c breakage rate of millpebs versus 25 mm media in ball mills application ore type bwi kwht f80 m bond ball top size millpebs energy savings finer grind secondary ball mill cuznpb 120 93 8 mm 100 36 same regrind ball mill cupb 120 30 5 mm 100 37 same regrind ball mill cuznpb 100 40 5 mm 100 40 same.

First a jar mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net hphrt to grind from the design feed size to the required product size the second test a bond work index determination results in a specific energy value net hphrt from an empirical formula.

For every bond ball mill work index test carried out at jktech a standard report is issued the report details the bond test procedure method and presents the results including f80 p80 grindability and work index further interpretation of the results is available if required frequently asked questions bond ball mill work index.

Formula of ball mill basic introduction formula of ball mill is the material after being broken and then to smash the key equipment since 1893 has been widely used in metal ore and nonmetallic material crushed ore concentrator metallurgy building materials.

Formula of ball mill processchina formula of ball milling formula of ball mill basic introduction formula of ball mill is the material after being broken and then to smash the key equipment since 1893 has been widely used in metal ore and nonmetallic material crushed ore concentrator metallurgy building materials chemicals and.

Gates jd giblett a dunne r 2012 prediction of plant ball mill media wear rates from laboratory ball mill test data comminution 12 minerals engineering wear of grinding media in the.

Index in a ball mill bbwi which is based on a first order kinetics present in the bond ball mill for grinding mineral raw materials austin et al 1981 ahmadi and shahsavari 2009 theoretical basis of quick procedure grinding of various mineral raw materials in the bond ball mill occurs according to.

Index of 277 pieces of process equipment office 405 3402673 fax 866 5833035 tollfree 800 5256277.

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.

the formula for calculation the wi index is as follows where g is material grindability at the ball mill gr f80 and 80 the mesh size whereby 80 of material is sieved in starting material and industrial product respectively there is usually a weight 1520.

Optimization of mill performance by using online ball and pulp measurements by b clermont and b de haas synopsis ball mills are usually the largest consumers of energy within a mineral concentrator comminution is responsible for 50 of the total mineral processing cost in todays global markets expanding mining groups are trying.

Planetary ball mills are used wherever the highest degree of fineness is addition to wellproven mixing and size reduction processes these mills also meet all technical requirements for colloidal grinding and provide the energy input necessary for mechanical extremely high centrifugal forces of a planetary ball mill result in very high pulverization energy and.

Retsch is the world leading manufacturer of laboratory ball mills and offers the perfect product for each application 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.

Rod mill work index has not been de ned as yet the ball mill work index is con rmed at 16 kwht the operating work index though is in the range of 21 kwht to 25 kwht showing high inef ciency this raises the point that in some cases the bond ef4 oversize factor calculation is.

The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 mm 6 mesh to product size in the range of 45150 m 325100 mesh thus determining the ball mill work index wi b or bwi the work index calculations across a narrow size range are conducted using the appropriate laboratory work.

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 densformula of ball mill process.

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.

The mill product can either be finished size ready for processing or an intermediate size ready for final grinding in a rod mill ball mill or pebble mill agsag 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.

Use this online formula to calculate a ball mill rod mill or sag mill operating work index based on fred bonds work you can estimate the energy used into your grinding circuit this is the most accurate and informative method but much of the data necessary for its application is not yet available a total apparent volumetric charge filling including balls and excess slurry on top of.