The bond ball mill work index is a measure of the resistance of the material to grinding in a ball mill it can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions
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The bond ball mill work index is a measure of the resistance of the material to grinding in a ball mill it can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions
Bond ball mill grindability test the bond ball mill work index bbwi test is carried out in a standardised ball mill with a predefined media and ore charge the work index calculated from the testing can be used in the design and analysis of ball mill circuits the test requires a minimum of 10kg of sample that has been stagecrushed
Ball mill design requires a bond work index bwi for ball mills at the correct passing size sag mill design requires an appropriate sag test for example spi chapter 5 flotation design needs a valid measure of kinetics for each sample including the maximum attainable recovery and rate constants for each mineral chapter 12
Modbond grindability test 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 used to show the orebody hardness profile and to predict throughput in a ball mill circuit
2 the operating work index wio of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions kwht power applied per ton of feed to the grinding unit wi the standard bond work index of the ore p 80 the 80 cumulative passing size of the product in microns f 80
Ball mill a typical type of fine grinder is the ball mill a slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls ball mills normally operate with an approximate ball charge of 30
Critical frequency the mill power is p 162 watts calculated by the formula provided by stamboltzis 7 pmn 99 6 where m kg is the mass of balls 65 kg plus the feed 05 kg n hertz is the rotating frequency and d m the mill diameter for the batch tests the mill is loaded and rotates for a time t
The bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior the spir value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant
Bond approach consists of determining the ore hardness characteristics or work index wi via standardized laboratory testwork the full suite of bond comminution tests provide the ball mill work index bwi the rod mill work index rwi the crusher work index cwi and the abrasion index ai
Insmart bond ballmill work index is a measure of the resistance of the material to grinding in a ball mill this index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
The bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior 18 the spir value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant
The work index wi is calculated in a laboratoryscale ball mill with bond equation the bond work index has been widely used in designing fullscale mills but the bond test is rather complex lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify bond test procedure weiss 1985
Standard bond crushing and rod mill work indices abrasion indices and by dawson for bond 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
Ball mill wio bwio 86 circuit wio owio 146 bond ball mill work index bwi kwht 134 bond rod mill work index rwi kwht 181 table 1 example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on
In a closed circuit dry grinding environment the ground product for the laboratory sag mill is then submitted to the bond ball mill work index test the number of sag mill revolutions required to grind the material to a p 80 of 17 mm is used to predict agsag specific energy using quation 4 correction e
Processing capacity 8176th feeding size 0mm
Processing capacity 12200th feeding size 1251500mm
Processing capacity 065615th feeding size 5mm
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