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Bond work index tests grinding solutions offers a range of bond work index testing from crushability and abrasion to ball and rod mills for more information on the tests please see below bond low energy impact test the bond lowenergy impact test can be used to determine the crusher work index cwi also known as the impact work index
Wave liner bond rod mill testwork bond rod mill work index sagmillingcom the bond rod mill work index is not as common as the bond ball mill work index and there are two different variations on the mill apparatus the sagmillingcom models expect a mill with a wave liner and is not compatible with mills using smooth liners get price bond s rod mill for work
See this useful summary table of bond work index by minerals for any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um
Sizing a crusher can be done reliably calculated thanks to the impactcrushing work index and the testwork research done by fred chester bond and his 1952 paper according to bonds third theory of comminution the workenergy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product the feed a crude test
Commentary on the apparatus of the bond rod mill work index by alex doll december 2015 the bond third theory of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when bond and his collaborators were gathering the information to calibrate comminution models
Energy requirements for crushing and hpgr options can now be determined in addition to agsag mills and with mic ball mills the results from conducting the smc test are used to determine the socalled dropweight index dwi which is a measure of the strength of the rock
Testwork bond ball mill work index sagmilling com measuring ore grindability in balls mills 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
The grinding jar for the bond index rod mill is 12 x 24 in size and has a waveshaped design at least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill the rod mill work index rwi is used for particle size determination in a size range from 25 mm down to 21 mm whereas ball mill work
Generally bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power in the current research a simple fast and accurate procedure is introduced to find the
Jul 17 2019 phase ii metallurgical testwork to support the optimised pfs will be undertaken in q3q4 2019 using ore samples from the phase ii drilling program the testwork program is expected to include the following o comminution testing including bond crushing work index bond rod mill work index
Relation of bond rod mill work index and crushing work index similar to the ball mill work index the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms unlike the ball mill work index the size of the feed to a rod mill test 10 mm12 mm is closer to the size of the crushing test
The bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the bond work index the test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed
Bonds 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
Jktech continues its proud history of leading the industry in offering state of the art ore breakage characterisation methodologies our comminution testing suite offers clients breakage characterisation data for a wide range of applications
The mill power is 225 watts calculated by 6 fi p nally the product is wet screened to find the size d80 24 rod mill semi continuous process the same mill is used for the semi continuous grinding tests which is similar to the bond test but with the exist ing mill of known power after time the mill
The bond work index is not solely a material constant but is influenced by the grinding conditions for example the finer the grind size desired the higher is the kwht required to grind to that size magdalinovic 38 measured the bond work index of three ore types using different test screen sizes he produced a correlation between the mass of test screen undersize per revolution g and
Bond rod mill grindability test the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills various correction factors may have to be applied the test is a closedcircuit dry grindability test performed in a standard rod mill
Testwork required bond ball mill work index bond rod mill work index bond crushing lowenergy impact work index required parameters f 80 m is the 80 passing size of the fresh feed to the circuit expected to be a bondcompatible size distribution
Figure 5 bond rod mill work index v unconfined compressive strength 0 100 200 300 400 ucs mpa 5 10 15 20 25 30 35 wirm metric the lack of fit observed relating the crushing work index was expected to carry over to the other bond work indices figure 5 displays the plot of rod mill work index wi rm versus ucs these
The experiment results confirm that the introduced method is a rapid and accurate method to determine the bond rodmill work index the bond rodmill work indices obtained by this method were compared to those of standard bond work indices with having different testsieves
2 modelling the specific grinding energy and ballmill scaleup ballmill scale up bonds lawdata zbond work index w i zfeed d f and product d size both 80 cumulative passing result the specific grinding energy w mill power draw p wt where t the mill capacity mill dimensions from tables or charts
Use of work index since its introduction in the 1960s the bond ball mill work index bbmwi parameter has been extensively used in predicting ball mill power draw along with comminution circuit design the work index parameter is widely used in tracking mill performance due to the age and lack of controls for the test many
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